All Potato Alerts

final report of the 2024 potato psyllid / Lso monitoring season.

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potato psyllid

Posted on: September 12, 2024 by Tasha Stanzak

This is the
final report of the 2024 potato psyllid / Lso monitoring season.

One psyllid
from last week’s samples tested positive for Lso, the bacterium associated with
zebra chip disease (ZC).

About 4% of all
psyllids tested positive for Lso this year compared to about 6% last year and around
1% in most recent years (with the exception of 2022 in which 22% were positive).

It was another
interesting year with moderately high Lso incidence, but relatively low overall
psyllid captures. Captures were only slightly higher than last year. Thus, the
risk of ZC likely was mitigated somewhat by low psyllid captures despite
relatively high Lso.

Please remember
that our research with Russet Burbank shows that ZC can develop during storage
if infection occurs as late as two weeks before vine kill. Please maintain your
IPM programs, especially in areas with higher captures of Lso-positive
psyllids.

Thanks again to
all of our cooperators who helped to deploy and retrieve so very many yellow
sticky traps! And thanks to the growers who let us use their fields for this
work!

More information on management can be
found here:

Management: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

To view the
weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit
the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid
captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures increase a bit; no new Lso positives

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potato psyllid

Posted on: September 5, 2024 by Tasha Stanzak

• This week we received traps from 52 of the 58 fields that we are monitoring.

• We captured a total of 40 psyllids across 11 fields.

• Captures were from the following counties: Payette, Canyon, Owyhee, Elmore, and Twin Falls.

• None of the psyllids collected last week tested positive for Lso.

Psyllid captures increased this week to their highest level overall this season; however, captures are still relatively low and similar to the season-long totals from last year. Thankfully, no new Lso-positive psyllids were collected last week. Although psyllid captures have been relatively low this season, Lso incidence was slightly higher than in most recent years, which may slightly elevate risk of ZC. Please maintain you IPM programs, especially in areas with higher captures of Lso-positive psyllids.

This is our last week of retrieving traps from the field and reporting on captures. Next week we will report on Lso testing results from the psyllids collected this week and wrap up the season. 

Please maintain your IPM programs. More information on management can be found here: 

https://www.uidaho.edu/extension/ipm/ag-pests/arthropods/psyllids

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2024 as well as an archive of this year’s weekly summaries: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures still low; one new Lso positive

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potato psyllid

Posted on: August 29, 2024 by Erik Wenninger

• This week we received traps from 53 of the 58 fields that we are monitoring; 5 sites are finished for the season.

• We captured a total of 19 psyllids across 5 fields.

• Captures were from the following counties: Payette, Canyon, and Twin Falls.

• One of the psyllids collected last week tested positive for Lso.

Psyllid captures continue to be relatively low overall—slightly lower than last week and similar to the low captures we saw over the last two years at this time. We did find another Lso-positive psyllid last week so—despite the low captures—we are seeing some positives, which may slightly elevate the risk of ZC. A psyllid from a set of sticky traps that arrived late to us could not be tested, so we will have those results by next week. As we get into vine kill, remember that our research with Russet Burbank shows that ZC can develop during storage if infection occurs as late as two weeks before vine kill.

Please maintain your IPM programs. More information on management can be found here: https://www.uidaho.edu/extension/ipm/ag-pests/arthropods/psyllids

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2024 as well as an archive of this year’s weekly summaries: https://idahopestmonitoring.org/

Psyllid captures remain relatively low; one more Lso positive

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potato psyllid

Posted on: August 15, 2024 by Erik Wenninger

• This week we received traps from 38 of the 58 fields that we are monitoring; two of our crop consultant collaborators were not able to get to their fields this week but we expect to get those traps next week. 

• We captured a total of 16 psyllids across 5 fields.

• Captures were from the following counties: Payette, Canyon, Owyhee, and Twin Falls.

• One of the psyllids collected last week tested positive for Lso.

Psyllid captures were relatively low again this week and similar to the captures observed at this time during the last two years. Of course, we did not receive traps from several fields, but last week most of those fields showed zero psyllid captures (and a few had one capture), so we may expect to see only a slight increase in the total captures when we get those trap captures added to the tallies. One Lso-positive psyllid from last week was from Payette County. We continue to see a smattering of Lso-positives psyllids over this season; however, the relatively low psyllid captures overall should mitigate risk of ZC. 

Please have your IPM programs in place. More information on management can be found here: https://www.uidaho.edu/extension/ipm/ag-pests/arthropods/psyllids

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2024 as well as an archive of this year’s weekly summaries: https://idahopestmonitoring.org/

4 Lso-positive psyllids; overall captures still moderately low

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potato psyllid

Posted on: August 8, 2024 by Erik Wenninger

• This week we received traps from 58 of the 58 fields that we are monitoring. 
• We captured a total of 21 psyllids across 11 fields.
• Captures were from the following counties: Payette, Canyon, Owyhee, and Twin Falls.
• Four of the psyllids collected last week tested positive for Lso.

Psyllid captures declined this week relative to last week. Captures overall continue to be moderately low and similar to the last two years. One Lso-positive psyllid was from Payette County, one from Elmore County, and two from Twin Falls County. Incidence of Lso usually diminishes over the season, though it is not unheard of to see a few positive psyllids in July to August. Thankfully overall captures have been relatively low this year, which should mitigate risk of ZC even with slightly higher Lso incidence in psyllids. 

We urge growers to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/extension/ipm/ag-pests/arthropods/psyllids

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2024 as well as an archive of this year’s weekly summaries: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

3 Lso positive psyllids; captures tick up only slightly

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potato psyllid

Posted on: August 1, 2024 by Tasha Stanzak

• This week we received traps from ¬¬58 of the 58 fields that we are monitoring. 

• We captured a total of 38 psyllids across 16 fields.

• Captures were from the following counties: Payette, Canyon, Owyhee, Elmore, Twin Falls, and Minidoka.

• Three of the psyllids collected last week tested positive for Lso.

Psyllid captures ticked up only slightly this week relative to last week. Captures overall continue to be moderate and similar to last year. One Lso-positive psyllid was from Payette County and two from Twin Falls County. Incidence of Lso usually diminishes over the season, though it is not unheard of to see a few positive psyllids in July to August. Thankfully overall captures have been moderate this year, which should mitigate risk of ZC even with slightly higher Lso incidence in psyllids. 

Nevertheless, we urge growers to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/extension/ipm/ag-pests/arthropods/psyllids

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2024 as well as an archive of this year’s weekly summaries: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

psyllid captures continue to be moderate; no new Lso positives

Potato    All Locations

potato psyllid

Posted on: July 25, 2024 by Tasha Stanzak

• This week we received traps from 58 of the 58 fields that we are monitoring. 

• We captured a total of 30 psyllids across 14 fields.

• Captures were from the following counties: Payette, Canyon, Gooding, Twin Falls, Minidoka, and Bingham.

• None of the psyllids collected last week tested positive for Lso.

Psyllid captures continue to be moderate. Captures this week were only slightly higher than what we found at this time over the last two years. Captures in the Treasure Valley and Upper Snake were similar to last week; captures in the Magic Valley ticked up only slightly relative to last week. We have captured a total of only 3 Lso-positive psyllids so far, which is lower than the Lso incidence we found at this time over the last few years. Typically we find the highest incidence of Lso in psyllids early during the season, so this low incidence so far is a good sign that overall Lso incidence for this season may be low. 

Nevertheless, we urge growers across the state to have their IPM programs in place. More information on management can be found here: 

https://www.uidaho.edu/extension/ipm/ag-pests/arthropods/psyllids

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2024 as well as an archive of this year’s weekly summaries: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

psyllid captures tick down; one more Lso-positive psyllid

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potato psyllid

Posted on: July 18, 2024 by Tasha Stanzak

• This week we received traps from 57 of the 58 fields that we are monitoring. 

• We captured a total of 14 psyllids across 11 fields.

• Captures were from the following counties: Canyon (2 fields), Owyhee, Jerome (2 fields), Twin Falls (4 fields), Cassia, and Bingham.

• One more psyllid collected last week in Twin Falls County tested positive for Lso.

Psyllid captures have been ticking down slightly over the last two weeks. Captures this week were similar to what we found at this time over the last two years. So, after seeing moderately high captures at the start of the monitoring season, we are now seeing relatively low captures. We have captured a total of 3 Lso-positive psyllids so far, which is lower than the Lso incidence we found at this time over the last few years. 

Nevertheless, we urge growers across the state to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/extension/ipm/ag-pests/arthropods/psyllids

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2024 as well as an archive of this year’s weekly summaries: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

2024 Miller Research Potato Pest Management Field Day

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Posted on: July 17, 2024 by Jeff Miller

Miller Research will be holding its annual potato pest
management field day on Wednesday, August 21 from 10:00 AM to 12:00 PM. The cost to attend is $20. Two ISDA and two CCA (PM) credits are available. More information can be found by following the attached link.

» https://millerresearch.com/event/2024-miller-research-potato-pest-management-field-day/

» 2024_MR_Field_Day_Announcement_Final.pdf

psyllid captures similar across the state

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potato psyllid

Posted on: July 12, 2024 by Tasha Stanzak

• This week we received traps from all 58 fields that we are monitoring. 

• We captured a total of 34 psyllids across 15 fields.

• Captures were from the following counties: Canyon (4 fields), Owyhee, Twin Falls (6 fields), Gooding, Jerome, Bannock, and Bingham. 

• One more psyllid collected from the Kimberly Research & Extension Center last week tested positive for Lso.

• None of the other psyllids collected last week tested positive for Lso. We are still waiting on results from 4 psyllids that were delivered to us late last week.

Psyllid captures this week were higher than at this time in the last two years; however, captures have not been as high as 2020-2021. It is noteworthy that we are now seeing similar numbers of psyllids per field across the state. We typically see higher captures in the Treasure Valley before captures increase across the rest of the state, so these observations are unusual. Thankfully we did not see an uptick in Lso-positive psyllid captures this week. 

We urge growers across the state to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/extension/ipm/ag-pests/arthropods/psyllids

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2024 as well as an archive of this year’s weekly summaries: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

2024 Potato psyllid monitoring program underway in Idaho

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potato psyllid

Posted on: July 4, 2024 by Erik Wenninger

The University of Idaho and our crop consultant collaborators across the state are once again monitoring for potato psyllids, zebra chip disease (ZC), and liberibacter (Lso), the bacterium associated with ZC. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by the Idaho Potato Commission and generous in-kind contributions by our cooperators. 

Our official monitoring season began with wide deployment of traps last week and will continue for at least 10 weeks. We have 58 fields across the state this year, using 4 sticky traps per field at all sites. 

• This week we received traps from all 58 fields that we are monitoring. 

• We captured a total of 53 psyllids across 19 fields.

• Captures were from the following counties: Payette, Canyon (3 fields), Owyhee, Twin Falls (10 fields), Jerome, Cassia, Minidoka, and Bingham. 

• Sites in Twin Falls County had a total of 43 psyllids. 

• We also captured 1 psyllid from the Kimberly Research & Extension Center last week that tested positive for Lso.

• For psyllids captured this week, we expect to have results on Lso incidence next week. 

Psyllid captures this week were higher than at this time in the last two years. It is noteworthy that most of the captures came from the Magic Valley, and most of those from one field (though captures in Twin Falls County were widespread). We typically see higher captures in the Treasure Valley before the Magic Valley, so these observations are unusual. It is not uncommon to see a few Lso-positive psyllids early in the season and fewer as the season progresses. However, if we continue to see relatively high captures in addition to more Lso-positives, this will represent higher ZC risk. 

Given the potentially higher ZC risk, we strongly urge growers to have their IPM programs in place. More information on management can be found here: 

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures from 2020 through 2024: https://idahopestmonitoring.org/

» https://www.uidaho.edu/cals/potatoes/pest-management/psyllid-management

» https://tinyurl.com/potatopsyllid

» https://idahopestmonitoring.org/

2024 Miller Research Potato Pest Management Seminar Handouts

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Posted on: April 15, 2024 by Jeff Miller

The 2024 Miller Research Potato Pest Management Seminar was held on February 21 at the Historic Wilson Theater in Rupert, ID. Handouts from the presentations are now available at the attached link.

» https://millerresearch.com/2024/04/2024-miller-research-potato-pest-management-meeting/

ICIA Seed Seminar - January 16, 2024 - Red Lion Hotel - Pocatello, Idaho

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General announcement

Posted on: January 10, 2024 by Kasia Duellman

Dear All:

I have been remiss in passing on this information regarding the Annual ICIA Seed Seminar that precedes the Idaho Potato Conference, sponsored by the Idaho Crop Improvement Association. Please forgive me - the deadline for early registration has passed, but you can register at the door on the day of the event. 

Date: January 16, 2024

Time: Seed Seminar - 11:30AM to 3:45PM (a closed PAC meeting follows, from 3:45PM to 5:00PM)

Location: Red Lion Hotel, 1555 Pocatello Creek Road, Pocatello, Idaho

For questions, please contact Ruby Hall at ICIA via email (rhall@idahocrop.com) or phone (208-522-9198).

Please see attached the registration form and the agenda.

Sincerely,

Kasia

» ICIA Seed Seminar Agenda

» ICIA Seed Seminar Registration

University of Idaho Potato Storage Open House

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Posted on: November 6, 2023 by Gustavo Teixeira

Potato Enthusiasts -- Get ready for an extraordinary experience! You are warmly
invited to the inaugural University of Idaho Potato Storage Open House taking
place at the state-of-the-art Potato Storage Facility at the Kimberly Research
and Extension Center on December 5th, from 9:00 am to noon. 

What's in Store for You? At this event, we're bridging the gap
between industry and cutting-edge U of I storage research, and we've packed the
morning with exciting activities: 

Explore the Future: Witness the latest breakthroughs and
advancements in potato storage through captivating research posters and live
demonstrations. 

Behind the Scenes: Step inside the innovative Potato Storage
Facility and see where the magic happens. Discover how this facility supports
our industry-related research and extension projects, contributing to your
economic growth. 

Knowledge Exchange: Join our U of I researchers in lively
discussions about the most current potato research practices and industry
trends. 

But that's not all! Your participation at the Open House will
not only be highly appreciated but also incredibly insightful and
rewarding. 

Event Details: 

Date: December 5th 

Time: 9:00 am - noon 

Location: Potato Storage Facility, Kimberly Research and
Extension Center 

Don't miss out on this unique opportunity to connect, learn, and be a
part of the future of potato storage. 

» Open_House_Flyer_2023.pdf

final report of the 2023 potato psyllid / Lso monitoring season.

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potato psyllid

Posted on: September 21, 2023 by Tasha Stanzak

This is the final report of the 2023 potato psyllid / Lso monitoring season. 

All of the psyllids tested last week were negative for Lso, the bacterium associated with zebra chip disease (ZC). 

About 6% of all psyllids tested positive for Lso this year compared to around 1% in most recent years (and 22% last year). 

It was another interesting year with somewhat high Lso incidence, but relatively low overall psyllid captures. Captures were only slightly higher than last year, which was among our lowest years ever. Thus, the risk of ZC likely was mitigated somewhat by low psyllid captures despite relatively high Lso.

Thanks again to all of our cooperators who helped to deploy and retrieve so very many yellow sticky traps! And thanks to the growers who let us use their fields for this work!

More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid trapping wrap up

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potato psyllid

Posted on: September 14, 2023 by Tasha Stanzak

We officially ended the monitoring season last week, but we received a bonus week of sticky traps from two fields in Canyon County this week. We captured a total of 12 psyllids across these 2 fields.

None of the six psyllids captured last week was positive for Lso, the bacterium associated with zebra chip disease (ZC). Next week we will report Lso results for the 12 psyllids submitted this week and provide an end-of-season wrap up.

About 7% of all psyllids tested positive for Lso this year compared to around 1% in most recent years (and 22% last year). It is too soon to tell what this low psyllid / somewhat high Lso season means for ZC in tubers at harvest. Our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs. Risk could be mitigated by processing tubers from fields at higher risk sooner rather than later. 

More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid trapping ends for the season.

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potato psyllid

Posted on: September 7, 2023 by Tasha Stanzak

This week we received traps from 20 of the 55 fields that we are monitoring. Thirty-three fields have been vine killed or are senescing and are no longer being monitored. We captured a total of 6 psyllids across 3 fields. The three fields were in Canyon, Elmore, and Twin Falls counties.

This is our last week of actively trapping psyllids. We will post the final results next week to finish out the monitoring season.

One psyllid tested from last week’s Canyon County captures was positive for Lso, the bacterium associated with zebra chip disease (ZC); the rest of the psyllids captured last week were negative for Lso. This is the first Lso positive we have detected since early July.

With harvest season upon us, it is worth remembering that our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs. More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures dropped this week

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potato psyllid

Posted on: September 1, 2023 by Erik Wenninger

This week we received traps from 31 of the 55 fields that we are monitoring. Twenty-two fields have been vine killed or are senescing and are no longer being monitored. We captured a total of 15 psyllids across 7 fields. Five of the fields were in Canyon County, and the other two fields were in Elmore and Twin Falls counties.

Total psyllid captures dropped notably from last week. The slightly cooler temperatures and precipitation likely contributed to lower captures.

All psyllids tested from last week’s captures were negative for Lso, the bacterium associated with zebra chip disease (ZC); however, the results from the psyllids that arrived to us late are still pending. Interestingly, we still have not had a positive psyllid since early July.

With harvest season upon us, it is worth remembering that our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs. More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures per field similar to last week

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potato psyllid

Posted on: August 25, 2023 by Tasha Stanzak

This week we received traps from 35 of the 55 fields that we are monitoring. One field was vine killed and we are still waiting on traps from 19 sites. Many of these fields could not be entered earlier in the week so traps were shipped to us late. We captured a total of 30 psyllids across 10 fields. Four of the fields were in Canyon County; the remaining 6 fields were in Elmore, Gooding, and Twin Falls counties.

Total psyllid captures per field were similar to last week, though several of the fields still unaccounted for are sites where we’ve seen relatively high captures this season. Updated results will be posted on the sites (below) early next week, and we’ll send out another alert if anything unexpected is observed. 

All psyllids tested from last week’s captures were negative for Lso, the bacterium associated with zebra chip disease (ZC). We have not had a positive psyllid since early July.

Nevertheless, we urge growers to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures tick up slightly, but still relatively low

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potato psyllid

Posted on: August 17, 2023 by Erik Wenninger

This week we received traps from 49 of the 55 fields that we are monitoring. We captured a total of 44 psyllids across 14 fields. Ten of the fields were in Canyon County; the remaining 4 fields were in Payette, Elmore, and Twin Falls counties.

Total psyllid captures ticked up slightly, at least in the Treasure Valley; however, captures were still relatively low compared to previous years. This is the time of year that we typically see captures increase, so this uptick is not surprising. 

All psyllids tested from last week’s captures were negative for Lso, the bacterium associated with zebra chip disease (ZC); results are pending for seven psyllids that were shipped late. Although we saw relatively high prevalence of Lso in early samples, we have not had a positive psyllid since early July.

Nevertheless, we urge growers to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures remain low; no new positives

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potato psyllid

Posted on: August 10, 2023 by Erik Wenninger

This week we received traps from 50 of the 55 fields that we are monitoring. We captured a total of 30 psyllids across 12 fields. Seven of the fields were in Canyon County, the remaining 5 fields were in Payette, Owyhee, Elmore, and Twin Falls counties.

Total psyllid captures were similar to last week, and we continue to see quite low numbers this season. 

All of the psyllids captured last week were negative for Lso, the bacterium associated with zebra chip disease (ZC). We still urge growers to have their IPM programs in place given the prevalence of Lso earlier in the season. More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures still relatively low

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potato psyllid

Posted on: August 3, 2023 by Tasha Stanzak

This week we received traps from 46 of the 55 fields that we are monitoring. We captured a total of 29 psyllids across 13 fields. Nine of the fields were in Canyon County, the remaining 4 fields were in Payette, Owyhee, Gooding, and Twin Falls counties.

Total psyllid captures were slightly higher than last week, but we continue to see quite low numbers this season. 

All of the psyllids captured last week were negative for Lso, the bacterium associated with zebra chip disease (ZC). This is good news considering the prevalence of positive psyllids during early July, but we still urge growers to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

» https://idahopestmonitoring.org/

No new positive psyllids this week

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potato psyllid

Posted on: July 28, 2023 by Erik Wenninger

This week we received traps from 53 of the 55 fields that we are monitoring. We captured a total of 21 psyllids across 9 fields. Six of the fields were in Canyon County, the remaining 3 fields were in Payette, Owyhee, and Twin Falls counties.

Total psyllid captures were slightly higher than last week, but we continue to see quite low numbers this season. 

All of the psyllids captured last week were negative for Lso, the bacterium associated with zebra chip disease (ZC). This is good news considering the prevalence of positive psyllids the last two weeks, but we still urge growers to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

» https://idahopestmonitoring.org/

More Lso-positive psyllids

Potato    All Locations

potato psyllid

Posted on: July 20, 2023 by Tasha Stanzak

This week we received traps from 46 of the 55 fields that we are monitoring. We captured a total of 10 psyllids across 4 fields. Three of the fields were in Canyon County and one was in Twin Falls County.

Total psyllid captures were similar to last week, and we continue to see relatively low numbers this season. 

However, 12 of the 14 psyllids we captured last week were positive for Lso, the bacterium associated with zebra chip disease (ZC). In addition, one of the three psyllids from the previous week that was shipped late also tested positive. Thus, 15 of the 19 psyllids tested this season have been positive. 

It is not unusual to see more Lso-positive psyllids early in the season, but this level of Lso is higher than we typically see. It is fortunate that psyllid numbers are quite low, but the high prevalence of Lso suggests that we should be vigilant. We strongly urge growers to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

Please visit the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures and an archive of blog posts for this season: https://idahopestmonitoring.org/

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

» https://idahopestmonitoring.org/

First Lso-positive psyllid of the season

Potato    All Locations

potato psyllid

Posted on: July 15, 2023 by Erik Wenninger

Apologies! This alert was posted on Friday, but an alert was not sent. 

This week we received traps from all 55 fields that we are monitoring. We captured a total of 14 psyllids across 10 fields. Seven of the fields were in Canyon County; the remaining 3 fields were in Owyhee, Twin Falls, and Minidoka counties. 

One of the psyllids we collected last week from Canyon County was positive for Lso, the bacterium associated with zebra chip disease (ZC). The other psyllids from last week were shipped to us late, so results are expected by Monday (and will be posted to the Idaho Pest Monitoring Dashboard, below). A positive psyllid this early in the season is somewhat concerning. ZC risk is in part a function of psyllid numbers and Lso incidence, so it is fortunate the psyllid numbers have been low so far. Nevertheless, we urge growers to watch psyllid captures closely and to have their IPM programs in place. More information on management can be found here: https://www.uidaho.edu/cals/potatoes/news/psyllid-management

Please visit our new site, the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures for this season and the previous three seasons: https://idahopestmonitoring.org/

We will be posting and archiving our weekly updates on this site. In addition to the graphical summaries, you will be able to look back on all the weekly “blog” summaries for this year and easily compare captures among counties, regions, and years over 2020 to 2023.

To view the weekly data by site in the old spreadsheet format: https://tinyurl.com/potatopsyllid

» https://idahopestmonitoring.org/

» https://www.uidaho.edu/cals/potatoes/news/psyllid-management

» https://tinyurl.com/potatopsyllid

2023 Miller Research Potato Pest Management Field Day

Potato    All Locations

Posted on: July 11, 2023 by Jeff Miller

The 2023 Miller Research Potato Pest Management Field Day will be Wednesday, August 23 from 10:00 am to 12:15 pm with lunch to follow. More details are provided at the link and in the attached flier.

» https://millerresearch.com/event/2023-miller-research-potato-pest-management-field-day/

» 2023_MR_Field_Day_Announcement.pdf

2023 Potato psyllid monitoring program underway in Idaho

Potato    All Locations

potato psyllid

Posted on: July 7, 2023 by Tasha Stanzak

The University of Idaho and our crop consultant collaborators across the state are once again monitoring for potato psyllids, zebra chip disease (ZC), and liberibacter (Lso), the bacterium associated with ZC. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by the Idaho Potato Commission and generous in-kind contributions by our cooperators. 

Our official monitoring season began with wide deployment of traps last week and will continue for 10 to 12 weeks. We have 55 fields across the state this year, using 4 sticky traps per field at all sites. 

This week we received traps from 52 of the 55 fields that we are monitoring. We captured a total of four psyllids across three fields, all in Canyon County. In addition, a limited number of fields was monitored prior to the official start of the monitoring program. We captured one psyllid in a field in Canyon County last week and zero so far over four weeks of monitoring at the Kimberly Research & Extension Center. 

It is still early, but thus far we are seeing relatively low numbers of psyllids, similar to the numbers we observed in 2022. 

We expect to have results on Lso incidence next week.

Please visit our new site, the Idaho Pest Monitoring Dashboard, for graphical summaries of our psyllid captures for this season and the previous three seasons: https://idahopestmonitoring.org/

We will be posting and archiving our weekly updates on this site. So in addition to the graphical summaries, you will be able to look back on all the weekly “blog” summaries and easily compare this year’s captures to previous years. 

» https://idahopestmonitoring.org/

Importance of scouting for late blight in potato

Potato    Treasure Valley, Treasure Valley - Idaho, Magic Valley

Late blight (potato)

Posted on: June 21, 2023 by Brad Stokes

Importance of scouting for late blight in potato

Kasia Duellman, Jeff Miller, Nora Olsen, Mike Thornton, Phill Wharton and James Woodhall

It has been several years since we have had an outbreak of late blight in Idaho.  It is easy to forget that late blight can be a threat in this region given all the other issues that growers have to deal with during the growing season.  However, history tells us that the most widespread late blight outbreaks have been associated with two factors: 1) presence of volunteer potatoes from the previous crop and/or planting of seed potatoes sourced from regions where late blight frequently occurs, and 2) frequent rain events throughout the growing season.

We want to stress that late blight has not been found in Idaho so far this year.  However, the unseasonably wet and moderate weather we’ve had recently has created conditions for potential late blight outbreaks in many locations.  For example, in western Idaho where the crop is just closing the rows, we have had several weeks of intermittent showers as shown by records from the Parma Agrimet site.

Although many areas of Idaho experienced a colder than normal winter, higher snow falls across the Snake River Valley mean that the soil temperatures in many areas remained above freezing.  The University of Idaho Volunteer Survival Model (https://cropalerts.org/volunteer-survival/), shows the risk of volunteer potato survival this year was high in most areas in southern Idaho.  Infected volunteer potatoes, cull piles and seed tubers along with the recent wet weather conditions can all potentially contribute to the development of a late blight this year.  As such, it would be prudent to plan ahead for the management of any potential late blight outbreaks.

Effective management of late blight requires the implementation of an integrated disease management approach, including strict sanitation practices (e.g. management of cull piles), good irrigation management, and the proper timing and application of effective fungicides.  All these practices together can reduce the chances of a late blight outbreak.  

Scouting is the first line of defense against late blight.  Field scouting should begin after emergence when the first plants are 4 to 6 inches tall. In potato fields after plants close across the rows, look for late blight in the lower portions of the plant where the foliage stays wet longer. Scouting should be concentrated in areas of the field most likely to remain wet for the longest period of time, such as the center tower of pivot irrigation system, irrigation overlaps, and areas missed by fungicide applicators such as the edges of fields.  Low spots where soil moisture is highest and parts of the field shaded by windbreaks are examples of areas where scouting should be intensified.  The symptoms of late blight (see pictures at the end of this article) can be confused with other diseases and physiological disorders.  If you find plants displaying symptoms of late blight, we recommend you take them to a local expert than can confirm the diagnosis.

Scouting allows growers to make informed disease and pest management decisions and provides early detection of other problems that may be present in the field, such as nutrient deficiency or herbicide injury.  By using information collected by scouts, growers can time fungicide applications for optimal effectiveness.  This is especially important for the control of late blight as fungicides are most effective when applied to foliage before infection occurs or when the disease is in its very earliest stages of development and no symptoms are visible.  In the irrigated fields of southern Idaho, late blight can be very difficult to manage once infections become established as the humid microclimate within the canopy favors further disease development after irrigation.

There are a wide range of fungicides labeled for use against potato late blight.  Each fungicide is different and will have specific conditions for use listed on the label with additional details regarding application rates, re-entry intervals and total product amounts that can be applied in a season.  Some may even include information on how to minimize the risk of fungicide resistance developing.  Fungicides that are effective for the control of late blight tend to have one of three modes of action: germination inhibition (they prevent germination of spores and thus plant infection), inhibiting mycelial growth (they block pathogen colonization of the plant cells), anti-sporulation activity (they prevent the pathogen from sporulating and thus limit spread of the disease).  For more information on properties of fungicides registered for use in potatoes go to the following link: https://cropalerts.org/2020/04/24/potato-late-blight-control-recommendations-for-southern-idaho-in-2020/.

In years when late blight has been confirmed in Idaho it has usually appeared after mid-July.  In the last wide scale outbreak that occurred in SE Idaho, late blight was first reported in Bingham County on July 10.  On that date, the high temperature recorded at Aberdeen R&E Center was 67^oF and it had been a wet June with daily rainfall totals as high as 0.5 in. (see below). These are ideal disease conditions.  If you suspect late blight please contact your local county UI Extension office or Kasia Duellman, Jeff Miller, Nora Olsen, Mike Thornton, Phill Wharton or James Woodhall. 

To provide additional information on the threat of late blight the University of Idaho operates a spore trapping network in cooperation with the Idaho Potato Commission.  Weekly updates from this network will be on the IPM website (https://idahopestmonitoring.org) starting the week of July 3^rd. 

» Late blight foliar

» Late blight stem

» Late blight

Forecast is for cloddy with a chance of weeds

Potato    All Locations

Weed control in cloddy fields

Posted on: May 19, 2023 by Pamela Hutchinson

All will agree that weather conditions spring 2023 have been
unusual: wide ranging snow cover, snow melt runoff and water pooling in fields,
and short bursts of intense wind and rain. One of the impacts on soil conditions
after potato growers were finally able to get into the fields for tillage and planting
has been the formation of clods.

What happens: Some preemergence herbicides applied
and sprinkler incorporated, or even chemigated, might not get below the clods,
resulting in patches of weeds emerging though the untreated soil.

What can be done: Questions have arisen about what
can be done proactively and the answer can be keeping herbicide solubility in
mind when designing a tank mixture. A more soluble herbicide might move through
and/or around ending up below clods resulting in better coverage. than a
herbicide with relatively less solubility.

What you need to know: In general, with the medium-
to coarse-textured, moderate organic matter content, neutral to high pH soils
in the PNW, potato herbicide solubility ranging from high to low: Matrix (rimsulfuron)
>> metribuzin, Outlook (dimethenamid-p) > Dual Magnum (s-metolachlor),
Eptam (EPTC) >> Linex (linuron), Reflex (fomesafen), Zidua
(pyroxasulfone) >> Chateau (flumioxazin), Sonalan (ethalfluralin),
Treflan (trifluralin), and Prowl H2O (pendimethalin). NOTE: Sulfentrazone
solubility is similar to that of Outlook unless soil pH is above 7.5, then it
is more soluble than the any of the other herbicides. Use of Trade Names is
not an endorsement for one product over another with the same active ingredient.

Put it together: Design a tank mixture for the weed
species in a field with inclusion of soluble herbicides that can move below the
clods for the best coverage possible.  

Example: Control hairy nightshade, common
lambsquarters, and green foxtail in a cloddy field. Tank mix soluble Matrix or
Outlook for h. nightshade + soluble metribuzin for c. lambsquarters + moderately
soluble Linex for both** of the broadleaves. All provide green foxtail control.

Get out the crystal ball and the umbrella: If “unusual”
amounts of rainfall occur within 1 or 2 weeks after application and incorporation,
the “soluble” herbicides could move too far below the weed seed germination
zone.  

 Reference: Targeted Tank Mixtures for Weed Control in Potatoes – UI Extension
Bulletin 950 https://www.uidaho.edu/extension/publications/bul/bul950

 **Keep in mind that tank mixing herbicides with different Sites
of Action (SOA) controlling the same weed species (“overlapping” control) is highly
recommended for herbicide resistance management. In the example given, Matrix, Outlook,
metribuzin, and Linex all have different SOAs. Without Linex, there is no
overlapping SOA for hairy nightshade and no overlapping SOA for common
lambsquarters. Linex as the third partner in the mix controls c. lambsquarters  and has activity on h. nightshade. As a
result, there is more than one SOA on both weeds. The overlap is necessary for
herbicide resistance management. That one-in-a-million plant in the population naturally
tolerant to one SOA does not survive because the other SOA in the tank mixture will
provide control. If the tolerant plant survives and produces seeds because
overlapping herbicide SOA are not tank mixed and/or not rotated, then resistance
in the population could develop over time if only the one herbicide SOA is used.
         

Examples of Potato
Herbicide Sites of Action and weeds controlled - herbicides within [ ]
have the same SOA:

Hairy nightshade - Matrix, [Outlook/Dual Magnum/Zidua],
Eptam, [Reflex/Chateau], Linex;

Common lambsquarters – metribuzin, [Prowl H2O/Sonalan/Treflan],
Linex;

Redroot pigweed – all of these herbicides except metribuzin
when the population in a field is resistant to metribuzin;

Green foxtail – all of these herbicides.

 When common lambsquarters is in a field with hairy nightshade,
then getting satisfactory SOA overlap is challenging. Linex seems to be the
only herbicide in that situation that can provide overlapping SOA for hairy
nightshade AND overlapping SOA for common lambsquarters.  

» Solubility of herbicides labeled for use in potatoes

Miller Research Winter 2023 Potato Disease Management Seminar

Potato    All Locations

Posted on: January 12, 2023 by Jeff Miller

Miller Research will be holding its annual Potato Pest
Management Meeting in person on February 16, 2023, at the Historic Wilson
Theater in Rupert, ID. The meeting will run from 9:00 am to 12:15 pm with a 15-minute
break at 10:30 am. CCA credits and ID, WA, and OR pesticide recertification
credits have been requested for the meeting.

For those not able to attend in person, a virtual option
will be available. If you want to participate by Zoom, contact Cheryn Suarez
(cheryn@millerresearch.com) after registration and she will
send you the link to attend. Virtual attendees will need to answer questions on
Zoom to verify participation. Thus, each person desiring credits needs to be
logged in and stay logged in for the duration of the meeting. Contact us if you
need to make other arrangements.

Registration is $20 to cover the cost of the meeting.
Additional proceeds will be donated to the local 4-H program.

The agenda is in the attached file.

» https://millerresearch.com/event/miller-research-winter-2023-potato-disease-management-seminar/

» 2023_Seminar_Announcement.pdf

final report of 2022 Idaho potato psyllid monitoring

Potato    All Locations

potato psyllid

Posted on: September 16, 2022 by Erik Wenninger

This is the final report of the 2022 potato psyllid / Lso monitoring season. 

The two psyllids captured last week tested negative for Lso, the bacterium associated with zebra chip disease (ZC). 

It was an interesting year with very low psyllid captures overall, but relatively high incidence of Lso. About 22% of all psyllids tested positive for Lso compared to around 1% in most recent years. It is too soon to tell what this low psyllid / high Lso season means for ZC in tubers at harvest. Our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs. Risk could be mitigated by processing tubers from fields at higher risk sooner rather than later. 

Thanks again to all of our cooperators!

With the monitoring season behind us, we urge you to kick the proverbial tires of our new Idaho Pest Monitoring site: https://idahopestmonitoring.org/

Please check it out and send us any feedback that we may use to improve the site. Our eventual goal is to make this a one-stop shop for all Idaho pest monitoring programs, but this is obviously still a work in progress.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the link under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

To view contour maps that illustrate relative psyllid abundance across the landscape, you can set up a free account here: https://potatoes.decisionaid.systems/ Updated maps will be generated every Friday morning.

» https://idahopestmonitoring.org/

psyllid monitoring update - 1 Sep 2022

Potato    All Locations

potato psyllid

Posted on: September 1, 2022 by Erik Wenninger

This week we received traps from 57 of the 72 fields that we are monitoring this year. Four fields have been vine killed and were not monitored. We found a total of only 5 psyllids across 5 (9%) of the 57 fields observed. 

Psyllids were captured in the following counties: Canyon (2 fields), Elmore (1 field), and Twin Falls (2 fields).

None of the psyllids collected last week tested positive for Lso, the bacterium associated with zebra chip disease (ZC). 

Psyllid captures were especially low this week, and thankfully we’ve been seeing less and less Lso in recent weeks. With harvest season upon us, it is worth remembering that our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs. Risk could be mitigated by processing tubers from fields at higher risk sooner rather than later. 

In addition to the regular links (below) with details on trap captures over the season, we are developing a new Idaho Pest Monitoring site that includes graphical summaries of our psyllid captures for this season and the previous two seasons: https://idahopestmonitoring.org/

Please click around on the Potato Psyllid / Zebra Chip Monitoring link and send us any feedback that we may use to improve the site. Our eventual goal is to make this a one-stop shop for all Idaho pest monitoring programs, but you can see that this is still a work in progress.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the link under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

To view contour maps that illustrate relative psyllid abundance across the landscape, you can set up a free account here: https://potatoes.decisionaid.systems/ Updated maps will be generated every Friday morning.

» https://idahopestmonitoring.org/

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/

psyllid monitoring update, 26th Aug 2022

Potato    All Locations

potato psyllid

Posted on: August 26, 2022 by Erik Wenninger

This week we received traps from 61 of the 72 fields that we are monitoring this year. Two fields have been vine killed and were not monitored; we are still waiting to receive traps from 9 fields in the Treasure Valley. We found a total of 16 psyllids across 10 (16%) of the 61 fields observed. 

Psyllids were captured in the following counties: Canyon (2 fields), Gooding (1 field), Twin Falls (3 fields), Cassia (2 fields), and Minidoka (2 fields). 

Two of the psyllids collected last week tested positive for Lso, the bacterium associated with zebra chip disease (ZC). One was from a field in Canyon County and one from a field in Minidoka County.

We continue to see very low captures of psyllids relative to previous years and numbers are perhaps even lower this week than last week. However, we have also seen relatively high incidence of Lso, especially during previous weeks. With harvest season upon us, it is worth remembering that our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs. Risk could be mitigated by processing tuber from fields at higher risk sooner rather than later. 

In addition to the regular links (below) with details on trap captures over the season, we are developing a new Idaho Pest Monitoring site that includes graphical summaries of our psyllid captures for this season and the previous two seasons: https://idahopestmonitoring.org/

Please click around on the Potato Psyllid / Zebra Chip Monitoring link and send us any feedback that we may use to improve the site. Our eventual goal is to make this a one-stop shop for all Idaho pest monitoring programs, but you can see that this is still a work in progress.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the link under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

To view contour maps that illustrate relative psyllid abundance across the landscape, you can set up a free account here: https://potatoes.decisionaid.systems/ Updated maps will be generated every Friday morning.

» https://idahopestmonitoring.org/

» http://www.uidaho.edu/cals/potatoes/news

psyllid monitoring update, Aug 18, 2022

Potato    All Locations

potato psyllid

Posted on: August 18, 2022 by Erik Wenninger

This week we received traps from 68 of the 72 fields that we are monitoring this year. We found a total of 35 psyllids across 18 (27%) of the 68 fields observed. 

Psyllids were captured in the following counties: Canyon (4 fields), Payette (1 field), Gooding (1 field), Twin Falls (4 fields), Cassia (5 fields), and Minidoka (3 fields). 

Thankfully, none of the psyllids collected last week tested positive for Lso, the bacterium associated with zebra chip disease (ZC). 

Psyllid captures are increasing as they always seem to do late in the season, though we continue to see very low captures of psyllids relative to previous years. However, we have also seen relatively high incidence of Lso during previous weeks. Most captures this week were from the eastern Magic Valley and western Treasure Valley, with no captures recorded this week from eastern Idaho. We urge growers to watch psyllid captures and Lso incidence closely and to have their IPM programs in place. 

In addition to the regular links (below) with details on trap captures over the season, we are developing a new Idaho Pest Monitoring site that includes graphical summaries of our psyllid captures for this season and the previous two seasons: https://idahopestmonitoring.org/

Please click around on the Potato Psyllid / Zebra Chip Monitoring link and send us any feedback that we may use to improve the site. Our eventual goal is to make this a one-stop shop for all Idaho pest monitoring programs, but you can see that this is still a work in progress.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the link under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

To view contour maps that illustrate relative psyllid abundance across the landscape, you can set up a free account here: https://potatoes.decisionaid.systems/ Updated maps will be generated every Friday morning.

Psyllid Captures

Potato    All Locations

potato psyllid

Posted on: August 11, 2022 by Tasha Stanzak

This week we received traps from 70 of the 72 fields that we are monitoring this year. We found a total of 29 psyllids across 14 (20%) of the 70 fields observed. 

Psyllids were captured in the following counties: Canyon (4 fields), Payette (1 field), Elmore (1 field), Jerome (1 field), Twin Falls (3 fields), Cassia (1 field), and Minidoka (3 fields).

Interestingly, 9 of the 18 psyllids collected last week tested positive for Lso, the bacterium associated with zebra chip disease (ZC). Those positive psyllids were found in Canyon, Power, Cassia, and Twin Falls counties.

We continue to see low captures of psyllids this season, but relatively high incidence of Lso. We urge growers to watch psyllid captures and Lso incidence closely and to have their IPM programs in place. 

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the link under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

To view contour maps that illustrate relative psyllid abundance across the landscape, you can set up a free account here: https://potatoes.decisionaid.systems/ Updated maps will be generated every Friday morning.

more Lso-positive psyllids found

Potato    All Locations

potato psyllid

Posted on: August 4, 2022 by Erik Wenninger

This week we received traps from 68 of the 72 fields that we are monitoring this year. We found a total of 18 psyllids across 12 (18%) of the 68 fields observed. 

Psyllids were captured in the following counties: Canyon (5 fields), Payette (1 field), Jerome (2 fields), Twin Falls (1 field), Cassia (1 field), Minidoka (1 field), and Power (1 field).

Interestingly, 14 of the 17 psyllids collected last week tested positive for Lso, the bacterium associated with zebra chip disease (ZC). Positive psyllids were found in all counties in which we recorded psyllid captures last week.

We continue to see low captures of psyllids this season, but relatively high incidence of Lso. We urge growers to watch psyllid captures and Lso incidence closely and to have their IPM programs in place. 

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the link under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

To view contour maps that illustrate relative psyllid abundance across the landscape, you can set up a free account here: https://potatoes.decisionaid.systems/ Updated maps will be generated every Friday morning.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid Update July 28, 2022

Potato    All Locations

potato psyllid

Posted on: July 29, 2022 by Tasha Stanzak

This week we received traps from 66 of the 72 fields that we are monitoring this year. We found a total of 17 psyllids across 11 (17%) of the 66 fields observed. Psyllids were captured from three fields in Canyon County on traps that had been deployed for two weeks. 

Psyllids were captured in the following counties: Canyon (5 fields), Jerome (1 field), Twin Falls (3 fields), Cassia (1 field), and Minidoka (1 field).

Thankfully, none of the psyllids collected last week tested positive for Lso, the bacterium associated with zebra chip disease (ZC).

Psyllid numbers this week ticked up a bit from last week’s very low count, but overall captures continue to lag far behind the total captures that we observed by this time last year. 

Despite the low psyllid captures, given the incidence of Lso observed in previous weeks, we urge growers to watch psyllid captures closely and to have their IPM programs in place. 

As promised last week, we can share one of the figure summaries of psyllid captures over the season compared among years. Visit our site, below, to see one such figure illustrating this year’s low captures relative to the last two years. We hope to be able to show you more in the coming weeks as we work out the “bugs” on our new psyllid monitoring page. 

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the link under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

Also, to view contour maps that illustrate relative psyllid abundance across the landscape, you can set up a free account here: https://potatoes.decisionaid.systems/ Updated maps will be generated every Friday morning.

» psyllid_capture_comparison_by_week_2020_2021_to_26_july_2022.pdf

First Lso-positive psyllids of the 2022 season

Potato    All Locations

potato psyllid

Posted on: July 15, 2022 by Erik Wenninger

This week we had traps deployed in 64 of the 72 fields that we are monitoring this year. We found a total of only 4 psyllids across 2 (3%) of the 64 fields. 

Psyllids were captured in the following counties: Canyon (1 field) and Bingham (1 field).

5 of the 12 psyllids collected last week tested positive for Lso, the bacterium associated with zebra chip disease (ZC). Positive psyllids were collected from fields in Canyon, Owyhee, Twin Falls, and Cassia counties.

So far this has been a quiet season for psyllid captures in Idaho; by this time last year we were trapping well over 100 psyllids per week. However, the incidence of Lso observed last week is somewhat concerning. Risk of ZC is a function of both psyllid numbers and Lso incidence, so it is fortunate that psyllid numbers have been low thus far. In all of the fields in which a positive psyllid was found last week, no psyllids at all were found this week.

To view contour maps that illustrate relative psyllid abundance across the landscape, you can set up a free account here: https://potatoes.decisionaid.systems/ Updated maps will be generated every Friday morning.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the link under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

2022 Potato psyllid monitoring program underway in Idaho

Potato    All Locations

potato psyllid

Posted on: July 7, 2022 by Erik Wenninger

The University of Idaho and our crop consultant collaborators across the state are once again monitoring for potato psyllids, zebra chip disease (ZC), and liberibacter (Lso), the bacterium associated with ZC. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by the Idaho Potato Commission and generous in-kind contributions by our cooperators. 

Our official monitoring season began with wide deployment of traps last week and will continue for 10 to 12 weeks. We have 72 fields across the state this year, using 4 sticky traps per field at all sites. 

This week we had traps deployed in 64 fields, though we are still waiting for traps to come in from three fields. We found a total of 12 psyllids across 7 (11%) of the fields for which we have data. We have been monitoring three fields at the Kimberly Research & Extension Center since mid-May, and, interestingly, this week is the first that we have found potato psyllids. In previous years we nearly always captured psyllids here before the end of May. 

Psyllids were captured in the following counties: Canyon (3 fields), Owyhee (1 field), Twin Falls (2 fields), and Minidoka (1 field).

We expect to have results on Lso incidence next week in addition to “heat maps” and additional details.

More information on psyllid monitoring and management can be found here: 

https://www.uidaho.edu/cals/potatoes/news/psyllid-management

Details on weekly trap captures can be found here:

https://docs.google.com/spreadsheets/d/1av-jeEKrbDfYis-eS9nB-ZcKzazXyMWmz7NSAiyt3Go/edit?usp=sharing

» https://www.uidaho.edu/cals/potatoes/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1av-jeEKrbDfYis-eS9nB-ZcKzazXyMWmz7NSAiyt3Go/edit?usp=sharing

Growing Degree Days for Potatoes

Potato    All Locations

Posted on: April 28, 2022 by Nora Olsen and Mike Thornton

<p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%">Snow, hail,
rain, sunshine, and wind appear to be interchangeable this April. To focus on
the temperatures so far, calculating growing degree days (GDD) or heat units is
one method to look at the effect of temperature on the potato crop. Plant
growth and development is greatly influenced by temperature, and we use GDD to
get an idea of how the plant is developing throughout the season. It also gives
a great snapshot on how the current season compares to previous seasons. Daily
GDD is calculated by adding the maximum temperature and the minimum
temperature, dividing by 2 and subtracting a base temperature. The base
temperature is used to define the temperature at which potato growth is
diminished. <o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%">To quantify this
period of cold temperatures, we collated the cumulative GDDs for Parma,
Kimberly and Aberdeen. The source of the GDD was AgriMet (www.usbr.gov/pn/agrimet/wxdata.html)
weather stations located at the three sites. The AgriMet calculation of GDD
uses 50F as a minimum and 86F as a maximum. There are limitations to the use of
these minimum and maximums since potatoes will grow outside of this range, but
these calculations can still provide a reasonable prediction of the temperatures
impacting potato growth. The GDD these past weeks is quite a contrast to the
GDD from 2021 and the 11-year average.<o:p></o:p></span></p><p>



</p><p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%">To help
provide a picture of the relationship between temperature and plant
development, we will continue to update the GDD graphs weekly for the three
locations and post at </span><a href="http://www.uidaho.edu/cals/potatoes/storage"><span style="font-size:12.0pt;
line-height:107%">www.uidaho.edu/cals/potatoes/storage</span></a><span style="font-size:12.0pt;line-height:107%">. Aberdeen GDD was not available at
this time but will be posted on the website when available.<o:p></o:p></span></p>

» http://www.uidaho.edu/cals/potatoes/storage

Seeking help for a research project

Potato    All Locations

Posted on: April 7, 2022 by Jeff Miller

A research project funded by the tri-state (ID, WA, and OR) research consortium is looking for some help (see below). If you are able and interested, please contact David Wheeler (contact info below).

Good luck with planting!

Jeff

Potato soil health survey - your help is requested!

Potato    All Locations

Posted on: February 18, 2022 by Jeff Miller

Researchers from the University of Idaho, Montana State University, and the University of Minnesota would like your feedback on potato production and soil health. The results of this survey will influence the important research done by these teams. They'll ask questions about crop rotations, soil health management practices, and fumigation in this brief survey. As a token of their appreciation, you'll be eligible to enter into a drawing for a $100 Cabela's (or equivalent) gift card after you've completed the survey.  If you have any questions, please contact Alex Maas at alexmaas@uidaho.edu.

Click Here to Begin Survey

» https://uidaho.co1.qualtrics.com/jfe/form/SV_8bQye9iBZ5UHI0K

2022 Miller Research Potato Pest Management Meeting Final Notice

Potato    All Locations

Posted on: January 31, 2022 by Jeff Miller

Miller Research will be holding its annual Potato Pest Management Meeting in person on February 10, 2022, at the Historic Wilson Theater in Rupert, ID. The meeting will run from 8:30 am to 12:00 pm with a 30-minute break at 10:00 am. Three credits have been awarded for CCA (integrated pest management), Idaho, Oregon, and Washington pesticide recertification.

For those not able to attend in person, a virtual option will be available. If you want to participate by Zoom, contact Cheryn Suarez (cheryn@millerresearch.com) after registration and she will send you the link to attend. Virtual attendees will need to answer questions on Zoom to verify participation. Thus, each person desiring credits needs to be logged in. Contact us if you need to make other arrangements.

Registration is $20 to cover the cost of the meeting. After covering meeting costs, additional proceeds will be donated to the 4-H program.

Meeting agenda:

8:00 am – 8:30 am: Registration

8:30 am – 9:00 am: Seed treatments for Fusarium dry rot management

9:00 am – 9:30 am: The impact of anastomosis group on Rhizoctonia canker management

9:30 am – 10:00 am: Verticillium wilt control

10:00 am – 10:30 am: Break

10:30 am – 11:00 am: Control options for powdery scab and potato mop-top virus

11:00 am – 11:30 am: PVY and Seed Health (Dr. Jonathan Whitworth, USDA)

11:30 am – 12:00 pm: Managing pesticide resistance

» https://millerresearch.com/event/2022-miller-research-potato-pest-management-meeting/

» 2022_Seminar_Announcement.pdf

Idaho Potato Conference

Potato    All Locations

Posted on: January 13, 2022 by Nora Olsen and Mike Thornton

Early
registration ends tomorrow Friday January 14^th. Register Now!

The 54^th
annual Idaho Potato Conference and Eastern Idaho Ag Expo presented by the
University of Idaho and Spectra Productions will be live and in-person in 2022.
Set your calendars to attend the 2022 Idaho Potato Conference January 19 and 20
in Pocatello, ID. Attend your choice of educational presentations and workshops
from three concurrent sessions over the one and half-day conference and take
some time to visit the adjoining trade show that features over 70 booths and
displays highlighting agricultural products and services.

2022 highlights of the Idaho Potato
Conference:

·   There
will be several seminars and workshops on the impact of the 2021 season
including heat impact on potatoes, soil health, storage losses, and irrigation
efficiency.

·   Invited
speaker Dr. Carrie Wohleb from Washington State University will present on the Impacts
of Wildfire Smoke on Potatoes.

·      Current
outlooks on water, economics, labor and sustainability from industry leaders
will bring us up to date on major topics for the potato industry.

·      Special
guests from the National Potato Council, Potatoes USA, Idaho Potato Commission
will provide industry updates.

·      Multiple
pest protection presentations and workshops including tank mixing
considerations, rotational crops and herbicide carryover issues, pollinators
and potatoes, Fusarium dry rot aggressiveness, managing Rhizoctonia, diagnosing
crop injury, pesticide resistance management, alternatives to fumigation,
rotation and potato cyst nematode control, and comprehensive disease and weed
management workshops.

·      Economists
will present a workshop on the profitability implications of fertilizer cost
increases in addition to a discussion on the seasonality of retail rejections.
The latter discussion will dovetail with a one-hour workshop on the impact of
bruise on quality.

·      A
workshop dedicated to ‘Everything you wanted to know about potato viruses, but
were afraid to ask.’ Come with questions to ask a panel of experts on the topic
of tuber necrotic diseases.

·      Seminars
and workshops in Spanish will be held both days and include a wide variety of
topics from beneficial insect identification to farm safety discussions.

·      Earn
CCA (CEU) and pesticide recertification credits at seminars and workshops
throughout the in-person conference.

·      Select
theater presentations will be recorded and available at the conference website
after the conference. Registration for the conference will be required to gain
access to the recorded presentations.

·     
Cost for
pre-registration is $40 per person. Pre-registration will close at 5 pm MT on
January 14. After that time, please plan to register in-person at the
conference (cost increase to $50). We strongly encourage everyone to
pre-register and avoid the lines at the conference. Additional details
regarding the agenda, topics, and registration can be found at https://www.uidaho.edu/cals/potatoes/news/idaho-potato-conference.

» https://www.uidaho.edu/cals/potatoes/news/idaho-potato-conference.

2022 Idaho Potato Conference

Potato    All Locations

Posted on: January 6, 2022 by Nora Olsen and Mike Thornton

Register
Now!

The 54^th
annual Idaho Potato Conference and Eastern Idaho Ag Expo presented by the
University of Idaho and Spectra Productions will be live and in-person in 2022.
Set your calendars to attend the 2022 Idaho Potato Conference January 19 and 20
in Pocatello, ID.  Attend your choice of educational presentations and workshops
from three concurrent sessions over the one and half-day conference and take
some time to visit the adjoining trade show that features over 70 booths and
displays highlighting agricultural products and services.

2022 highlights of the Idaho Potato
Conference:

·   There
will be several seminars and workshops on the impact of the 2021 season
including effect of the weather on soil fertility, heat impact on potatoes,
soil health, storage losses, and irrigation efficiency.

·   Invited
speaker Dr. Carrie Wohleb from Washington State University will present on the Impacts
of Wildfire Smoke on Potatoes.

·      Current
outlooks on water, economics, labor and sustainability from industry leaders
will bring us up to date on major topics for the potato industry.

·      Special
guests from the National Potato Council, Potatoes USA, Idaho Potato Commission
will provide industry updates.

·      Multiple
pest protection presentations and workshops including tank mixing
considerations, rotational crops and herbicide carryover issues, pollinators
and potatoes, Fusarium dry rot aggressiveness, managing Rhizoctonia, diagnosing
crop injury, pesticide resistance management, alternatives to fumigation, rotation
and potato cyst nematode control, and comprehensive disease and weed management
workshops.

·        
Economists will present a workshop on
the profitability implications of fertilizer cost increases in addition to a
discussion on the seasonality of retail rejections. The latter discussion will
dovetail with a one-hour workshop on the impact of bruise on quality.

·        
A workshop dedicated to ‘Everything
you wanted to know about potato viruses, but were afraid to ask.’ Come with
questions to ask a panel of experts on the topic of tuber necrotic diseases.

·        
Seminars and workshops in Spanish will
be held both days and include a wide variety of topics from beneficial insect
identification to farm safety discussions.

Earn CCA (CEU) and pesticide
recertification credits at seminars and workshops throughout the in-person
conference.

Select presentations will be recorded
and available at the conference website after the conference. Registration for the
conference will be required to gain access to the recorded presentations.

Cost for pre-registration is $40 per person ($50 at the
door). We strongly encourage everyone to pre-register and avoid the lines at
the conference. Additional details regarding the agenda, topics, and
registration can be found at https://www.uidaho.edu/cals/potatoes/news/idaho-potato-conference.

» https://www.uidaho.edu/cals/potatoes/news/idaho-potato-conference

2022 Miller Research Potato Pest Management Meeting

Potato    All Locations

Posted on: December 17, 2021 by Jeff Miller

After meeting virtually in 2021, Miller Research will be
holding its annual Potato Pest Management Meeting in person on February 10,
2022, at the Historic Wilson Theater in Rupert, ID. The meeting will run from
8:30 am to 12:00 pm with a 30-minute break at 10:00 am. Three CCA (integrated
pest management) credits and three ISDA pesticide recertification credits have
been awarded for the meeting. Oregon and Washington credits have been requested.

We are working on making a virtual option available. If this
works, virtual attendees will still need to pay the registration fee and answer
questions during the presentation as proof of attendance.

Registration is $20 to cover the cost of the meeting.
Additional proceeds will be donated to the 4-H program.

Meeting agenda:

8:00 am – 8:30 am: Registration

8:30 am – 9:00 am: Seed treatments for Fusarium dry rot
management

9:00 am – 9:30 am: The impact of anastomosis group on
Rhizoctonia canker management

9:30 am – 10:00 am: Verticillium wilt control

10:00 am – 10:30 am: Break

10:30 am – 11:00 am: Control options for powdery scab and
potato mop-top virus

11:00 am – 11:30 am: PVY and Seed Health (Dr. Jonathan
Whitworth, USDA)

11:30 am – 12:00 pm: Managing pesticide resistance

» https://millerresearch.com/event/2022-miller-research-potato-pest-management-meeting/

» 2022_MR_Seminar_Announcement.pdf

Register for the in-person 2022 Idaho Potato Conference

Potato    All Locations

Posted on: November 29, 2021 by Nora Olsen and Mike Thornton

Registration
is now OPEN!

The 54^th
annual Idaho Potato Conference and Eastern Idaho Ag Expo presented by the
University of Idaho and Spectra Productions will be live and in-person in 2022.
Set your calendars to attend the 2022 Idaho Potato Conference January 19 and 20
in Pocatello, ID. Attend your choice of educational presentations and workshops
from three concurrent sessions over the one and half-day conference and take
some time to visit the adjoining trade show that features over 70 booths and
displays highlighting agricultural products and services.

Seminars and workshops in Spanish will
be held both days and include a wide variety of topics from beneficial insect
identification to farm safety discussions.

Earn CCA (CEU) and pesticide
recertification credits at seminars and workshops throughout the in-person
conference.

Select presentations will be recorded
and available at the conference website after the conference. Registration for the
conference will be required to gain access to the recorded presentations.

Cost for pre-registration is $40 per person ($50 at the
door). We strongly encourage everyone to pre-register and avoid the lines at
the conference. Additional details regarding the agenda, topics, and
registration can be found at https://www.uidaho.edu/cals/potatoes/news/idaho-potato-conference.

Psyllid Update September 17, 2021

Potato    All Locations

potato psyllid

Posted on: September 17, 2021 by Erik Wenninger

This is the final report of the 2021 Idaho psyllid monitoring program. 

From our samples from last week, we found our first Lso-positive psyllid of the season, on a site in Owyhee County. All other psyllids tested from last week were negative for Lso, the bacterium associated with zebra chip disease (ZC). The total percent positive among all sites for the season was 0.08%, which is the lowest incidence of Lso we have observed during the past decade. 

During mid- to late July, it appeared that overall psyllid captures would be relatively high this year; however, captures were lower during August, which is the time of year that our psyllid captures are often highest. It is possible that the high temperatures during June to July contributed to higher captures and the more moderate temperatures in August contributed to more modest captures. In the end, overall captures across the season were relatively modest compared to other seasons, and similar to overall captures last year.

Greater abundance of psyllids earlier during the season should generally contribute to greater risk of ZC disease development over the season. However, risk of ZC is a function of both psyllid abundance over the season and Lso incidence. The extremely low incidence of Lso observed in psyllids coupled with relatively modest captures overall, suggests relatively low risk of ZC in the crop this season. 

To dive more deeply into the capture data over the season, you can view contour maps that illustrate relative psyllid abundance across the landscape each week here: https://potatoes.decisionaid.systems/

More details can also be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the links under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

Psyllid Update September 9, 2021

Potato    All Locations

potato psyllid

Posted on: September 9, 2021 by Erik Wenninger

This week we had traps deployed in 48 fields, though we are still waiting for traps from one Treasure Valley field. We found a total of 66 psyllids across 15 (32%) of the 47 fields for which we have data. With many fields undergoing vine kill, this is our last week of retrieving sticky traps. We will, however, report on Lso results and a season recap next week.

Overall psyllid captures this week were similar to the last two weeks, with considerably lower captures than for most recent weeks. We recorded moderate captures in parts of the Treasure Valley and Owyhee to Elmore counties as well as near Twin Falls. We recorded low captures elsewhere. 

Psyllids were captured in the following counties: Canyon (3 fields), Owyhee (3 fields), Elmore (1 field), Twin Falls (5 fields), Minidoka (2 fields), and Cassia (1 field).

All psyllids tested from last week were negative for Lso, the bacterium associated with zebra chip disease (ZC). Testing of late-arriving psyllids from one field in Canyon County is pending. Thus far, all of our psyllid samples have been negative.

With harvest season upon us, it is worth remembering that our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs.

To view contour maps that illustrate relative psyllid abundance across the landscape, set up a free account here: https://potatoes.decisionaid.systems/

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the links under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» 2021-sep-09_minus.pdf

Psyllid Update September 2, 2021

Potato    All Locations

potato psyllid

Posted on: September 3, 2021 by Erik Wenninger

This week we had traps deployed in 58 fields, though we are still waiting for traps from one Treasure Valley field. We found a total of 72 psyllids across 13 (23%) of the 57 fields for which we have data. Many fields have undergone vine kill and will no longer be sampled.

Overall psyllid captures this week and last week have been considerably lower than for recent weeks. Contour maps (see links below) graphically reflect relatively high abundance of psyllids collected in Elmore County. We recorded moderate to low captures in other parts of the state and zero captures in eastern Idaho. 

Psyllids were captured in the following counties: Canyon (3 fields), Owyhee (3 fields), Elmore (2 fields), Gooding (1 field), and Twin Falls (4 fields).

We expect to get Lso results tomorrow, and we will post them on our sites (below) as soon as they are available. Thus far, all of our previous psyllid samples have been negative for Lso, the bacterium associated with zebra chip disease (ZC).

With harvest season upon us, it is worth remembering that our studies in Russet Burbank showed that ZC can develop during storage if infection occurs as late as two weeks before vine kill. Please consider this in your late-season IPM programs.

To view contour maps in more detail, set up a free account here: https://potatoes.decisionaid.systems/

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the links under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» 2021-09-08_minus.pdf

2022 Idaho Potato Conference Call for Topics

Potato    All Locations

Posted on: August 31, 2021 by Nora Olsen and Mike Thornton

This the first call for
topics for the 2022 Idaho Potato Conference that will take place in Pocatello,
ID on January 19th and 20th.  Please provide your ideas for potential
workshops and presentations for this year's conference to Nora Olsen (norao@uidaho.edu) or Mike Thornton (miket@uidaho.edu) by September 30^th so that we can put together
a preliminary list for the program planning meeting.  Please also suggest
a speaker if you have someone in mind that would do a good job of covering the
topic.

Psyllid Update August 19, 2021

Potato    All Locations

potato psyllid

Posted on: August 19, 2021 by Erik Wenninger

This week we had traps deployed in all 73 fields, though we are still waiting for traps from one field. We found a total of 115 psyllids across 25 (35%) fields. 

Overall psyllid captures were slightly lower than last week. Contour maps (see links below) still graphically reflect relatively high abundance of psyllids collected in some fields in the western Treasure Valley. The Elmore County “hot spot” is slightly diminished. Moderate to low captures were recorded in the Magic Valley. We captured two psyllids in Cassia County, but recorded no psyllid captures further east. 

Psyllids were collected on sticky traps in potato in the following counties: Canyon (7 fields), Payette (1 field), Gem (1 field), Owyhee (2 fields), Elmore (2 fields), Gooding (1 field), Jerome (2 fields), Twin Falls (7 fields), Cassia (2 fields), and Power (1 field).

Once again, all psyllids tested from last week were negative for Lso, though tests of psyllids from six fields in the western Treasure Valley that arrived late to us last week are still pending. We have yet to find any Lso-positive psyllids this season.

Nevertheless, we urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place. 

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the links under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

--To view contour maps in more detail, set up a free account here: https://potatoes.decisionaid.systems/

Psyllid Update August 12, 2021

Potato    All Locations

potato psyllid

Posted on: August 12, 2021 by Erik Wenninger

This week we had traps deployed in all 73 fields. However, we are still waiting to receive traps from 8 fields in the Treasure Valley (mostly in Canyon County). Of the 65 fields included in this update, we found a total of 93 psyllids across 19 (29%) fields. Updated data from the 8 missing fields will be added to our sites as soon as possible; almost certainly the overall psyllid tally for the week and especially for Canyon County will tick up a bit.

Overall psyllid captures were similar to last week. Contour maps (see links below) still graphically reflect relatively high abundance of psyllids collected in some fields in Elmore County (though slightly lower than in recent weeks) and the western Treasure Valley, but a small “hot spot” is also developing near Twin Falls. Otherwise, modest captures were recorded elsewhere in the Magic Valley, and we continue to see very few psyllids in the Upper Snake region. 

Psyllids were collected on sticky traps in potato in the following counties: Canyon (2 fields), Owyhee (3 fields), Elmore (2 fields), Gooding (1 field), Jerome (2 fields), Twin Falls (7 fields), Cassia (1 field), and Power (1 field).

Once again, all psyllids tested from last week were negative for Lso. We have yet to find any Lso-positive psyllids this season.

Nevertheless, we urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place. 

Contour maps or “heat maps” are included on the UI website (see link below). These maps describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed in collaboration with colleagues at Washington State University from our many years of data on psyllids in Idaho. We include just a screenshot of the contour maps on our site, so we encourage stakeholders to visit the Decision Aid Systems site and create a free account to view each week’s maps and other pest data in more detail: https://potatoes.decisionaid.systems/

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the links under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

Psyllid Update August 5, 2021

Potato    All Locations

potato psyllid

Posted on: August 5, 2021 by Erik Wenninger

This week we had traps deployed in all 73 fields monitored this year. We found a total of 94 psyllids across 30 (42%) of the 73 fields. 

Overall psyllid captures declined again from last week. Contour maps (see links below) still graphically reflect relatively high abundance of psyllids collected in some fields in Elmore County and the western Treasure Valley, but at least in the Treasure Valley tend to show more moderate incidence of psyllids than last week. Modest captures were recorded in the Magic Valley, and we continue to see very few psyllids in the Upper Snake region. 

Psyllids were collected on sticky traps in potato in the following counties: Canyon (9 fields), Owyhee (3 fields), Elmore (2 fields), Gem (1 field), Gooding (2 fields), Jerome (4 fields), Twin Falls (6 fields), Cassia (1 field), Minidoka (1 field), and Bingham (1 field).

All of the psyllids tested from last week and all previous weeks have been negative for Lso. 

Nevertheless, we urge growers to watch psyllid numbers closely during the coming weeks and to have their IPM programs in place. 

Contour maps or “heat maps” are included on the UI website (see link below). These maps describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed in collaboration with colleagues at Washington State University from our many years of data on psyllids in Idaho. We include just a screenshot of the contour maps on our site, so we encourage stakeholders to visit the Decision Aid Systems site and create a free account to view each week’s maps and other pest data in more detail: https://potatoes.decisionaid.systems/

More information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the links under “Updated weekly reports” for details on trap captures.

--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

Psyllid Update July 29, 2021

Potato    All Locations

Potato Psyllid

Posted on: July 29, 2021 by Lucy Standley

This week we
had traps deployed in all 73 fields monitored this year. We found a total of 126
psyllids across 36 (49%) of the 73 fields.

Psyllids were
collected on sticky traps in potato in the following counties: Canyon (11
fields), Owyhee (2 fields), Elmore (2 fields), Payette (1 field), Gem (1
field), Gooding (2 fields), Jerome (4 fields), Twin Falls (6 fields), Cassia (2
fields), Minidoka (3 field), and Power (2 fields).

Psyllid
captures overall declined a bit from last week. Contour maps (see links below)
still graphically reflect relatively high abundance of psyllids collected in
some fields in the western Treasure Valley and Elmore County, but both areas
show more moderate incidence of psyllids than last week. Moderate captures were
recorded in the Magic Valley, and we continue to see very few psyllids in the
Upper Snake region.

All of the
psyllids tested from previous weeks have been negative for Lso. Samples tested
from last week so far show no evidence of Lso; however, we only have results
from one of the two primers used to test for Lso. Results from the first primer
were all negative, which was sufficient to confirm a negative result in almost all
of our tests during that past ten years. We should have results from the second
primer tomorrow to confirm these results, and we will post another update if
any samples are positive.

We urge growers
to watch psyllid numbers closely during the coming weeks and to have their IPM
programs in place.

Contour maps or
“heat maps” are included on the UI website (see link below). These maps
describe predicted psyllid densities across the landscape, based on our trap
counts and on predictive models developed in collaboration with colleagues at
Washington State University from our many years of data on psyllids in Idaho.
We include just a screenshot of the contour maps on our site, so we encourage
stakeholders to visit the Decision Aid Systems site and create a free account
to view each week’s maps and other pest data in more detail: https://potatoes.decisionaid.systems/

More information
can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the
links under “Updated weekly reports” for details on trap captures.

--Click on the
“Psyllid Management” link on the left panel for information on psyllid and
zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/

Psyllid Update July 22, 2021

Potato    All Locations

Potato Psyllid

Posted on: July 22, 2021 by Lucy Standley

This week we
had traps deployed in all 73 fields monitored this year. We found a total of
191 psyllids across 31 (42%) of the 73 fields.

Psyllids were
collected on sticky traps in potato in the following counties: Canyon (11
fields), Owyhee (3 fields), Elmore (2 fields), Payette (1 field), Gem (1
field), Gooding (1 field), Jerome (3 fields), Twin Falls (7 fields), Minidoka
(1 field), and Power (1 field).

All of the
psyllids tested from previous weeks have been negative for Lso, though we are
waiting for results from 32 psyllids from six fields that arrived to us late.
We continue to have issues with shipping times being slower than in previous
years.

Psyllid
captures overall ticked up slightly from last week. Contour maps (see links
below) graphically reflect the relatively high abundance of psyllids collected
in some fields in the western Treasure Valley during the past three weeks, as
well as a “hot spot” that has been growing each week in Elmore County. A small
area west of Twin Falls showed relatively high captures this week as well. Very
few psyllids have been detected in the Upper Snake region thus far.

We urge growers
to watch psyllid numbers closely during the coming weeks and to have their IPM
programs in place.

Contour maps or
“heat maps” are included on the UI website (see link below). These maps
describe predicted psyllid densities across the landscape, based on our trap
counts and on predictive models developed in collaboration with colleagues at
Washington State University from our many years of data on psyllids in Idaho. We
include just a screenshot of the contour maps on our site, so we encourage
stakeholders to visit the Decision Aid Systems site and create a free account
to view each week’s maps and other pest data in more detail: https://potatoes.decisionaid.systems/

More information
can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the
links under “Updated weekly reports” for details on trap captures.

--Click on the
“Psyllid Management” link on the left panel for information on psyllid and
zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/

2021 Miller Research Potato Pest Management Field Day

Potato    All Locations

Posted on: July 20, 2021 by Jeff Miller

Miller Research will be holding its annual potato pest
management field day on Thursday, August 19. The event is open to the public
and there is no cost to attend but
please RSVP so we can plan appropriately for the event. This can be
done on our website or by responding to jeff@millerresearch.com or (208)
431-4420.  More details can be found by following the attached link.

» https://millerresearch.com/event/2021-miller-research-potato-pest-management-field-day/

» 2021-MR-Field-Day-Announcement.pdf

Psyllid Update July 15, 2021

Potato    All Locations

potato psyllid

Posted on: July 15, 2021 by Erik Wenninger

This week we
had traps deployed in all 76 fields monitored this year (though we are waiting
to receive traps from 11 sites). We found a total of 76 psyllids across 18 (28%)
of the 65 fields for which we have data. Several of the fields for which we are
waiting for traps are from fields in and near Canyon County in which we found relatively
high numbers of psyllids last week, thus we would expect these figures to tick
up when these data are added.

Psyllids were
collected on sticky traps in potato in the following counties: Canyon (6
fields), Owyhee (2 fields), Elmore (2 fields), Gooding (1 field), Jerome (2
fields), Twin Falls (5 fields), and Bingham (1 field).

All of the
psyllids tested from previous weeks have been negative for Lso, though we are
waiting for results from two individual psyllids from two fields from last week
(the other psyllids tested from those fields were negative).

Psyllid
captures overall are similar to last week. We urge growers to watch psyllid
numbers closely during the coming weeks and to have their IPM programs in place.

Contour maps or
“heat maps” of this week’s and the previous week’s results are included on the
UI website (see link below). These maps describe predicted psyllid densities
across the landscape, based on our trap counts and on predictive models developed
in collaboration with colleagues at Washington State University from our many
years of data on psyllids in Idaho. The maps graphically reflect the relatively
high abundance of psyllids collected in some fields in the western Treasure
Valley during the past two weeks, as well as a “hot spot” in Elmore County.
Abundance of psyllids remains moderate to low in the Magic Valley and very few
psyllids have been detected in the Upper Snake region.

We include just
a screenshot of the contour maps on our site, so we encourage stakeholders to
visit the Decision Aid Systems site and create a free account to view these and
other data in more detail: https://potatoes.decisionaid.systems/

More information
can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the
links under “Updated weekly reports” for details on trap captures.

--Click on the
“Psyllid Management” link on the left panel for information on psyllid and
zebra chip biology and management.

Psyllid Update July 8, 2021

Potato    All Locations

Potato Psyllid

Posted on: July 8, 2021 by Lucy Standley

This week we
had traps deployed in 73 of the 76 fields (96%) monitored this year and we
found a total of 139 psyllids across 30 (41%) of the 73 fields. We are waiting
to receive cards from 9 more sites.

Psyllids were
collected on sticky traps in potato in the following counties: Payette (1
field), Canyon (12 fields), Gem (1 field), Owyhee (3 fields), Elmore (2
fields), Gooding (1 field), Jerome (2 fields), Twin Falls (5 fields), Minidoka
(2 fields), and Power (1 field).

Lso results are
still pending due to shipping delays, but results will be posted on our site
(below) once results are in.

Thus far,
psyllid captures are tending to be a bit higher than they were at this time the
last two years. We urge growers to watch psyllid numbers closely during the
coming weeks and to have their IPM programs in place.

More information
can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the
links under “Updated weekly reports” for details on trap captures.

--Click on the
“Psyllid Management” link on the left panel for information on psyllid and
zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

2021 Potato psyllid monitoring program in Idaho

Potato    All Locations

potato psyllid

Posted on: July 2, 2021 by Erik Wenninger

The University
of Idaho and our crop consultant collaborators across the state are once again monitoring
for potato psyllids, zebra chip disease (ZC), and liberibacter (Lso), the
bacterium associated with ZC. The monitoring program covers commercial potato
fields throughout southern Idaho and is funded in part by the Idaho Potato
Commission and generous in-kind contributions by our cooperators.

Our official monitoring
season began with wide deployment of traps this week and will continue for 10
to 12 weeks. We should have about 76 fields across the state this year, using 4
sticky traps per field at all sites.

In early to mid-June
we began monitoring in three fields at the Kimberly R&E Center (KREC) and in
eight commercial fields in the Treasure Valley (mostly in Canyon County). On
traps retrieved during the weeks of June 14, 21, and 28, we captured a total of
1, 4, and 8 potato psyllids, respectively, among our fields at KREC. Among seven
of the eight fields in the Treasure Valley, we captured an average of about 2
psyllids per field during each of the last two weeks; however, in one Canyon
County field, we captured 19 psyllids this week.

All psyllids
tested so far from the previous weeks have been negative for Lso. We expect to
have more Lso results next week.

More details and
additional information can be found here: http://www.uidaho.edu/cals/potatoes/news

--Click on the
links under “Updated weekly reports” on the right for details on trap captures.

--Click on the
“Psyllid Management” link on the left panel for information on psyllid and
zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

2021 Miller Research Potato Disease Management Seminars

Potato    All Locations

Posted on: January 28, 2021 by Jeff Miller

Due to the COVID-19 pandemic, Miller Research will not be holding its annual Potato Pest Management Meeting. Instead, we will be having four 1-hour virtual seminars where we will discuss four different topics related to potato disease management. One CCA (integrated pest management) credit and one ISDA pesticide recertification credit have been awarded for each session. You will be required to answer some participation questions in order to get the ISDA credit. Each session will run from 12:00 noon to 1:00 pm. Registration is free.

Meetings will be held by Zoom and registration is required separately for each session. To register for each session, click on the link. You will be taken to a page where you need to enter your name and email address. After successfully registering, you will receive a confirmation email that contains the link to log into the session.

» https://millerresearch.com/events/

» MR Potato Disease Management Seminars

Virtual Idaho Potato Conference January 19-21, 2021

Potato    All Locations

Idaho Potato Conference

Posted on: January 4, 2021 by Nora Olsen

Registration is open! Plan to attend the 53rd annual Idaho Potato Conference January 19-21, 2021. Given the unusual times of a global pandemic, the Idaho Potato Conference shifted from the annual in-person conference held in Pocatello to three days of virtual presentations. The 20-minute pre-recorded presentations with an additional 5 minutes of live Q and A will be given throughout the morning of each day (8 am to noon MT). In addition, 5-minute updates by leading potato industry companies will be included each day.
Spanish Language Session will also be offered virtually for 2021. This session will be held from 1 to 3 pm on January 19th. Topics in Spanish will include reducing bruise, grading potatoes, common storage disease and much more. There will be short videos and live discussions led by University of Idaho extension educators Joseph Sagers and Jason Thomas.
Highlights for this year’s three-day virtual conference include:
• The virtual format allows us to invite many of our colleagues from outside of Idaho. We are pleased to have
o Dr. Paul Bethke from USDA-ARS in Wisconsin to discuss “Tuber lenticels”— what is their function and why do they become enlarged?
o Dr. Andy Robinson from North Dakota University/University of Minnesota – to elaborate on the seasonal topic of “Managing brown center and hollow heart”
o Dr. Ken Frost from Oregon State University will provide a much-needed summary on the “Blackleg/soft rot disease in potatoes”
o Dr. Mark Pavek from Washington State University will provide “Cultural management updates on Clearwater Russet and Alturas” and his graduate student Francisco Gonzalez will provide new (and old) information on “Measuring soil moisture in potato fields”
• The remainder of the 20-minute presentations will focus on a wide variety of topics:
o Changes in potato quality during packing and shipping
o Factors that impact development of bruises
o Analyzing the annual Idaho potato price change during crop transition
o What makes new varieties better than Burbank?
o Susceptibility of russet cultivars to common potato diseases
o Learning to use growth regulators
o Managing early die in potatoes
o Best management practices for pink rot and Pythium leak
o Soil-borne diseases – what causes them and what you can do about it
o Potato Mop Top virus (PMTV) and other viruses
o Diagnosing and predicting foliar diseases in Idaho
o What happened to Zebra Chip in ID?
o Variety reaction to Zebra Chip and interaction with PVY
o Volunteer potato control
o Using plant-pest interactions to build resistance
o What does healthy soil look like in Southern Idaho?
o Sustainability and the potato industry: working together to meet customer and consumer demands
o Idaho Potato Commission update

Idaho Pesticide License Recertification credits (3) will be available on January 20th. Attendees are required by ISDA to pass a short on-line quiz to receive credits.
Registration is free, but you must register in advance—including the Spanish language session. Additional details regarding the agenda, topics, and registration can be found at the conference website www.uidaho.edu/cals/potatoes/news/idaho-potato-conference.

» https://www.uidaho.edu/cals/potatoes/news/idaho-potato-conference

Lso results delayed

Potato    All Locations

Potato Psyllid

Posted on: September 17, 2020 by Lucy Standley

Last week’s Lso results are delayed because of the shutdown of main campus buildings due to wildfire smoke. We expect to post the results to our website by the end of next week. Sorry for any inconvenience.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Final psyllid trap capture report for the 2020 season

Potato    All Locations

potato psyllid

Posted on: September 10, 2020 by Erik Wenninger

This week we had traps deployed in 45 of the 65 fields (69%) monitored this year; 20 fields had been vine killed and were not monitored. We found a total of 105 psyllids across 16 (35%) of the 45 fields.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (5 fields), Owyhee (1 field), Elmore (4 fields), Twin Falls (5 fields), and Power (1 field).

From last week’s samples, no psyllids tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease (ZC).

We are not including “heat maps” this week given that they tend to show skewed patterns with smaller sample sizes.

This week concludes our 2020 psyllid monitoring program, following recommendations from our ZC Advisory Committee of shortening the duration. However, we will report on the last set of Lso results next week.

Total psyllid captures are still down from two weeks ago and based on previous years’ observations we would expect their numbers to continue to reduce; however, psyllids likely will continue dispersing among the remaining fields as vine kill continues. Overall captures of psyllids this season were higher than the last two seasons, though still nowhere near as high as the “epic” years of 2016 and 2012. Thus far, we have also seen our lowest incidence of Lso-positive psyllids yet (0.4%). Together, we expect that the modest psyllid abundance and very low Lso incidence this year should result in relatively low incidence of ZC in harvested tubers. But remember that, at least in our experiments with Russet Burbank, some risk of ZC remains if infection occurs within 1-2 weeks before vine kill.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

September 3, 2020 Psyllid Monitoring Update

Potato    All Locations

Potato Psyllid

Posted on: September 3, 2020 by Lucy Standley

This week we had traps deployed in 48 of the 65 fields (73%) monitored this year; 17 fields have been vine killed and will no longer be monitored. We found a total of 92 psyllids across 18 (37%) of the 48 fields.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (7 fields), Owyhee (1 field), Elmore (4 fields), Twin Falls (4 fields), and Power (2 fields).

From last week’s samples, no psyllids tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease (ZC). However, due to shipping delays from last week, a few Lso results will be delayed until next week.

We are not including “heat maps” this week given that they tend to show skewed patterns with smaller sample sizes.

Total psyllid captures were down considerably this week, which was related to fewer fields being monitored but also fewer captures in most of the remaining fields. It appears that we saw peak seasonal captures last week. However, remember that, at least in our experiments with Russet Burbank, some risk of ZC remains if infection occurs within 1-2 weeks before vine kill.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

August 28, 2020 First Lso-positive psyllid found in Canyon County

Potato    All Locations

Potato Psyllid

Posted on: August 28, 2020 by Lucy Standley

This week we had traps deployed in 60 of the 65 fields (92%) monitored this year; five fields have been vine killed and will no longer be monitored. We found a total of 199 psyllids across 35 (58%) of the 60 fields.

Psyllids were collected on sticky traps in potato in the following counties: Payette (1 field), Canyon (12 fields), Owyhee (2 fields), Gem (1 field), Elmore (5 fields), Gooding (1 field), Jerome (4 fields), Twin Falls (6 fields), and Power (3 field).

From last week’s samples, one psyllid (collected in Canyon County) tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease (ZC). However, due to shipping delays from last week, a few Lso results will be delayed until next week.

“Heat maps” of this week’s results are included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. The heat maps graphically reflect the relatively high abundance of psyllids collected in some fields in Canyon and Twin Falls counties.

Total psyllid captures were the highest we have observed this year, which is not surprising given that captures typically increase toward the end of the season, likely in part due to increase dispersal in relation to senescence and vine kill. We continue to urge growers to maintain their IPM programs. Tubers may still be at high risk of ZC if infection occurs 3 or more weeks before vine kill; in our experiments with Russet Burbank, risk diminishes within 1-2 weeks before vine kill but does not disappear.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August27East

» August27West

August 20, 2020 Psyllid Monitoring Update

Potato    All Locations

Potato Psyllid

Posted on: August 20, 2020 by Lucy Standley

This week we had traps deployed in 62 of the 65 fields (95%) monitored this year; three fields have been vine killed and will no longer be monitored. We found a total of 124 psyllids across 26 (41%) of the 62 fields. Of the 124 psyllids captured, 59 (47%) were found across 3 fields at University of Idaho Kimberly Research Center (KREC).

Psyllids were collected on sticky traps in potato in the following counties: Payette (1 field), Canyon (10 fields), Owyhee (1 field), Gem (2 fields), Elmore (5 fields), Jerome (2 fields), Twin Falls (4 fields), and Power (1 field).

From last week’s samples, no psyllids so far have tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease (ZC). However, due to shipping delays from last week, a few Lso results will be delayed until next week.

“Heat maps” of this week’s results are included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. The heat maps graphically reflect the relatively high abundance of psyllids collected in some fields in Twin Falls County.

Total psyllid captures dropped notably relative to last week, though high captures were still observed at KREC. We continue to urge growers to have their IPM programs in place, especially where psyllid numbers have been relatively high. Tubers may still be at high risk of ZC if infection occurs 3 or more weeks before vine kill; in our experiments with Russet Burbank, risk diminishes within 1-2 weeks before vine kill but does not disappear.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August20East

» August20West

August 13, 2020 Psyllid Monitoring Update

Potato    All Locations

Potato Psyllid

Posted on: August 13, 2020 by Lucy Standley

This week we had traps deployed in 64 of the 65 fields (98%) monitored this year; one field has been vine killed and will no longer be monitored. We found a total of 181 psyllids across 25 (39%) of the 64 fields. Of the 181 psyllids captured, 115 psyllids (63%) were found across 3 fields at University of Idaho Kimberly Research Center (KREC). Because this is an unusually high number of psyllids, we will only be testing a subset for Lso at this time.

Psyllids were collected on sticky traps in potato in the following counties: Payette (1 field), Canyon (8 fields), Owyhee (1 field), Gem (1 field), Elmore (2 fields), Gooding (1 field), Jerome (1 field), Twin Falls (8 fields), and Power (2 fields).

From last week’s samples, no psyllids tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease (ZC).

“Heat maps” of this week’s results are included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. The heat maps graphically reflect the relatively high abundance of psyllids collected in some fields in Twin Falls County.

Total psyllid captures were higher this week; however, captures for most fields were lower, and this increase can be attributed to surprisingly high captures at KREC. Captures were relatively high in a few other Magic Valley fields, though not to the extent observed at KREC. The reason for this is not clear. We continue to urge growers to have their IPM programs in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August13East

» August13West

On-line resources to help minimize potato bruise at harvest

Potato    All Locations

Posted on: August 10, 2020 by Nora Olsen

Potato harvest is upon us in Idaho and new on-line resources are available at the University of Idaho to help in bruise and quality management. Written and video resources can be found at www.uidaho.edu/cals/potatoes/bruise-management.
A new bulletin on ‘Monitoring tools for a potato bruise prevention program’ is now posted. This bulletin highlights tools or methods to quickly identify where in harvest and handling operation potatoes may experience physical impacts that cause blackspot and shatter bruises. The bulletin outlines a relatively simple and quick way to detect shatter bruises with the use of an iodine solution. The coloration of the shatter bruises makes it easy to determine the number and severity of the bruises. Although blackspots bruises take time to develop, recent research on Russet Burbank, Ranger Russet and Russet Norkotah indicates the ability to see a majority of the bruises within 3-5 hours after harvest. Peeling potatoes to identify early blackspot bruise symptoms is a useful monitoring tool that can help pinpoint equipment that needs to be adjusted. Another option is to run an instrumented sphere though your operation to measure the acceleration of an impact. The shape and size of the instrumented sphere mimics a potato, making it very useful tool to help identify handling equipment that may be at higher risk for bruising. Monitoring shatter and blackspot bruise levels during harvest and handling operations with the tools outlined in this bulletin provides opportunities to modify equipment and conditions; and also to identify lots or fields that have a greater degree of bruise. Training videos are also available on the website. These 3-minutes videos highlight how to run and operate equipment associated with harvest and handling of potatoes in order to prevent bruising and maximize crop quality. Available videos include:
- Windrower operation (English and Spanish)
- Harvester operation (English and Spanish)
- Moving potatoes from truck to piler (English)
- Best practices for piling potatoes (English and Spanish)
- Unloading potatoes out of storage (English)

Another Lso-positive psyllid

Potato    All Locations

Potato Psyllid

Posted on: July 30, 2020 by Lucy Standley

This week we had traps deployed in 65 of the 65 fields (100%) monitored this year; we found a total of 114 psyllids across 28 (43%) of the 65 fields.

Psyllids were collected on sticky traps in potato in the following counties: Payette (1 field), Canyon (10 fields), Owyhee (1 field), Gem (2 fields), Elmore (2 fields), Gooding (1 field), Jerome (2 fields), Twin Falls (7 fields), Minidoka (1 fields), and Power (1 field).

From last week’s samples, one psyllid (collected in Twin Falls County) tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease (ZC). This is the second observation of an Lso-positive psyllid in our monitoring program in as many weeks. Overall incidence of Lso still remains relatively low (about 1% through last week).

“Heat maps” of this week’s results are included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. The heat maps graphically reflect the relatively high abundance of psyllids collected in the Western Treasure Valley.

Psyllid captures were higher this week, though similar to total captures during late July to early August last year. Given this increase and the additional observation of an Lso-positive psyllid, we continue to urge growers to have their IPM programs in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» July30EastMap

» July30WestMap

First Lso-positive psyllids in 2020 Idaho monitoring

Potato    All Locations

Potato Psyllid

Posted on: July 23, 2020 by Lucy Standley

This week we had traps deployed in 59 of the 65 fields (91%) monitored this year (though we have not yet received traps from 6 of these fields); we found a total of 83 psyllids across 28 (53%) of the 53 fields with data.

Psyllids were collected on sticky traps in potato in the following counties: Canyon (12 fields), Owyhee (2 fields), Gem (2 fields), Elmore (3 fields), Jerome (1 field), Twin Falls (7 fields), Minidoka (2 fields), and Oneida (1 field).

From last week’s samples, two psyllids tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease (ZC). These hot psyllids were collected from two different fields: one in Twin Falls and one in Jerome County. This is the first observation of Lso-positive psyllids in our monitoring program this year. This is about one week and two weeks later than the first observation of Lso-positive psyllids during 2019 and 2018, respectively.

“Heat maps” of this week’s results are included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.

Psyllid captures were a bit higher this week, though similar to total captures during late July to early August last year. Given this increase and the first observation this year of Lso-positive psyllids in Idaho, we urge growers to have their IPM programs in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» July23WestMap

» July23EastMap

2020 Virtual Potato Association of American Annual Meeting - July 20-22

Potato    All Locations

Posted on: July 17, 2020 by Jeff Miller

Due to COVID-19, the Potato Association of America is holding its 2020 annual meeting online. This provides an excellent opportunity for more people to watch the presentations who have not been able to do so in the past.

The Virtual Annual Meeting will take place the afternoons of Monday, July 20th - Wednesday, July 22nd.


You are invited to join us online for educational sessions, poster presentations, and a LIVE Graduate Student Competition, all from the safety and comfort of your own home or office.

Registration is now available online! Limited spots available.

Delegates - $50 registration fee.

Program details and registration can be found at https://amr.swoogo.com/paa2020

As you browse the schedule of events, please note that all times listed are in Eastern Daylight Time (EDT)!

» https://amr.swoogo.com/paa2020

Psyllid Update July 16, 2020

Potato    All Locations

Potato Psyllid

Posted on: July 16, 2020 by Lucy Standley

This week we had traps deployed in 56 of the 65 fields (86%) monitored this year and we found a total of 42 psyllids across 22 (39%) of the 56 fields.

Psyllids were collected on sticky traps in potato in the following counties: Payette (1 field), Canyon (4 fields), Gem (2 fields), Elmore (1 field), Jerome (2 fields), Twin Falls (9 fields), Cassia (1 field), Power (1 field), and Oneida (1 field).

The remaining 9 fields (across Bingham and Power counties) had traps deployed in them this week, and we will report data from them next week.

Lso testing of last week’s psyllids has been delayed. We plan to report Lso results next week.

There was also an issue with the generation of “heat maps” that we expect to have resolved by next week.

Psyllid captures were similar to last week and similar to this time last year, though we urge growers to watch psyllid numbers closely during the coming weeks.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid Update July 9, 2020

Potato    All Locations

Potato Psyllid

Posted on: July 9, 2020 by Lucy Standley

This week we had traps deployed in 56 of the 65 fields (86%) monitored this year and we found a total of 44 psyllids across 22 (39%) of the 56 fields.

Psyllids were collected on sticky traps in potato in the following counties: Payette (1 field), Canyon (6 fields), Gem (2 fields), Elmore (3 fields), Jerome (1 field), Twin Falls (8 fields), and Minidoka (1 field).

From the last two week’s samples, so far 0 psyllids have tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease (ZC). However, we still have one psyllid from last week (collected from Twin Falls county) with pending Lso results.

We apologize for not having “heat maps” yet this week. We expect to have them generated before next week’s update and posted on our website.

Thus far, psyllid captures are similar to this time last year, though we urge growers to watch psyllid numbers closely during the coming weeks.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

2020 Potato psyllid monitoring program in Idaho

Potato    All Locations

Potato Psyllid

Posted on: July 2, 2020 by Lucy Standley

The University of Idaho and our crop consultant collaborators across the state are continuing the monitoring program for potato psyllids, zebra chip disease (ZC), and liberibacter (Lso), the bacterium associated with ZC. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by the Idaho Potato Commission and generous in-kind contributions by our collaborators.

Following guidance from our ZC Advisory Committee, we are running a shortened monitoring season beginning at the end of June and continuing for 10 to 12 weeks, using 4 sticky traps per field at all sites. Complications related to COVID-19 have limited the number of sites being monitored by some of our cooperators, but we expect to still have a total of about 65 fields across the state.

The first set of traps in commercial fields was deployed last week, with quite a few more having been deployed this week. We began monitoring at the Kimberly R&E Center (KREC) during mid-June.

During the week of June 22, we captured a total of 4 potato psyllids among our three monitored fields at KREC. During the week of June 29, we captured 11 psyllids across the same fields as well as 7 psyllids across three commercial fields in Canyon county. Psyllid abundance appears to be fairly low as is typical of June, but we will obtain trap data from many more sites next week.

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.
http://www.uidaho.edu/cals/potatoes/news/psyllid-management

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Additional resources for potato quality improvement are now available on-line

Potato    All Locations

Posted on: June 29, 2020 by Nora Olsen and Mike Thornton

As part of the Idaho Potato Commission-funded quality project we have been working with one of the largest retailers of potatoes to monitor the incidence of defects seen at the consumer level in the 2017, 2018 and 2019 potato crops. The good news is that we have seen an improvement in the quality of potatoes delivered over the three years of the project. We believe that this improvement in quality is due in large part to the emphasis on reducing bruise damage being exhibited at both the grower and shipper levels.
One of the best ways to reduce bruise damage is to focus on training the people that operate every piece of potato handling equipment on their role in the effort to improve quality. To that end, we have developed several training resources on our website under the “Bruise Management” tab. In 2019 we focused on videos that show windrower and harvester operators the key factors in operating that equipment in a way that minimizes bruise. But we realize that bruising can take place any time potatoes are handled, so in 2020 we focused on the equipment that moves potatoes from the truck into storage, the piling operation, and the process of removing the potatoes from storage. The result is three new videos entitled Moving Potatoes from Truck to Piler, Best Practices for Piling Potatoes, and Unloading Potatoes Out of Storage. Each video is only 3 to 4 minutes long, but cover the basic operating principles and show several viewpoints so that equipment operators can see what the machinery should look like when operating properly.
Special thanks go to Jason Thomas (Minidoka County Extension Educator) for the narration, and Bill Schaefer for shooting the video and editing it all into the final product.
The initial videos are available in English. However, we anticipate that a Spanish version of the videos will be posted shortly. All these videos are available at the following website:
https://www.uidaho.edu/cals/potatoes/bruise-management/training-videos

Volunteer potato control recommendations for 2020

Potato    All Locations

volunteer potatoes

Posted on: June 10, 2020 by Jerry Neufeld

The pdf below contains "Volunteer potato control recommendations for 2020." This information is provided by Dr. Pamela J.S. Hutchinson, Potato Cropping Systems Weed Scientist, University of Idaho Aberdeen R&E Center.

» Volunteer_potato_control_recommendations_for_2020_HUTCHINSON_June_02_2016.pdf

New edition of Potato Production Systems

Potato    All Locations

Posted on: June 5, 2020 by Jerry Neufeld

Dr. Mike Thornton, Professor of Plant Sciences, University of Idaho Parma Research and Extension Center is reporting that a new edition of Potato Production Systems was published recently by Springer Publishing. The comprehensive book includes contributions by 39 authors, 22 of whom are current or emeritus U of I faculty. The book, originally published by UI Extension in 2003, functions as a textbook for CALS Potato Science course and as a reference for potato industry professionals. You can find more information about the book on the Springer website by clicking on the link below.

» https://www.springer.com/us/book/9783030391560

Focus on Potato webcasts available at no cost.

Potato    All Locations

Posted on: April 21, 2020 by Jeff Miller

Focus on Potato webcasts (as well as all PMN webcasts) are now available for viewing at no cost. These webcasts are a great learning resource.

» https://www.plantmanagementnetwork.org/infocenter/topic/focusonpotato/

2020 Miller Research Potato Pest Management Seminar Handouts

Potato    All Locations

Posted on: February 6, 2020 by Jeff Miller

Miller Research held its 2020 Potato Pest Management Seminar on January 28, 2020, in Rupert, ID. Handouts from the meeting are available at the accompanying link.

» https://millerresearch.com/2020/01/handouts-from-the-miller-research-potato-pest-management-seminar/

Idaho Potato Conference Technical Room

Potato    All Locations

Potatoes

Posted on: January 7, 2020 by Nora Olsen

2020 Idaho Potato Conference January 22-23, 2020 in Pocatello, ID

New this year: Technical Room

The Clearwater room at the ISU Student Union Building will be transformed into 1-hour opportunities to learn, interact and ask questions with various companies on the technical use of their equipment. This year companies will focus on agronomic software programs, air-separators, and storage panels.

Agrian and Trimble will be available to talk specifics about their agronomic software programs.

Questions about your harvest air-separators/systems? Spudnik and Lockwood will be available to answer your questions.

IVI, Agri-Stor/Gellert and BTU Ventilation will each be available to go over the various options/opportunities with their storage panels and answer any questions you may have.

Schedule for the Technical Room:

Wednesday January 22, 2020
9:15 to 10:15 am – Agrian (agronomic software program)
11:00 am to noon – Spudnik (harvest equipment)
1:30 to 2:30 pm – Trimble (agronomic software program)
3:00 to 4:00 pm – IVI Industrial Ventilation Inc (storage panels)
4:15-5:15 pm – Agri-Stor/Gellert (storage panels)

Thursday January 23, 2020
8:30 to 9:30 am – Lockwood (harvest equipment)
9:45 to 10:45 am – BTU Ventilation (storage panels)

Visit idahopotatoconference.com for more information and to register for the conference.

2020 Miller Research Potato Pest Management Seminar

Potato    All Locations

Posted on: December 14, 2019 by Jeff Miller

Miller Research will hold its annual potato pest management seminar on Tuesday, January 28, 2020, at the Historic Wilson Theater in Rupert, ID (610 Fremont St). Registration is $10 to cover meeting costs with all excess funds being donated to the Minidoka County 4H program. Detailed information can be found on the attached flier and at the Miller Research website linked here.

» https://millerresearch.com/event/2020-miller-research-potato-pest-management-seminar/

» 2020-MillerResearchPotatoPestManagement.pdf

Idaho Potato Conference January 22-23, 2020

Potato    All Locations

Posted on: November 22, 2019 by Nora Olsen

Please mark your calendars for the 52nd annual Idaho Potato Conference and Trade Show presented by the University of Idaho and Spectra Productions to be held in Pocatello, Idaho January 22-23, 2020. Additional details and registration can be found at https://www.uidaho.edu/cals/potatoes/news/idaho-potato-conference
Highlights for this year’s conference include:
- Several seminars and workshops on the impact of the 2019 season including effect of spring rain on weed control, late season bulking and maturity, cold harvest weather and quality, and late season irrigation, disease and weed management.
- Invited speaker Dr. Sastry Jayanty from Colorado State University will present a seminar on How to minimize pressure bruise in long-term storages and a workshop on managing shrinkage in storage. Come listen to these presentations on Wednesday January 22.
- Invited speaker Dr. Carl Rosen from the University of Minnesota will address soil health and crop nutrient management. These presentations are part of a special session with dedicated seminars and workshops specifically focused on soil and crop health on Thursday January 23.
- Variety management and performance of new varieties, irrigation system efficiency, virus, minor insect pests, late blight and other diseases, how potatoes are graded, and much more will be discussed on Wednesday. Including a special panel discussion of industry issues by the Idaho Potato Commission, National Potato Council, and Potatoes USA.
- Optimizing fumigation, soilborne and seedborne diseases, pesticide drift and misapplication, and much more will be presented on Thursday January 23.
- Seminars and workshops in Spanish will be held both days and include a wide variety of topics from farm safety to disease and disorder identification.
- CCA and pesticide recertification credits will be available.
- New this year: a technical room dedicated to learning how various pieces of equipment or technology work. This year will include multiple storage panels, agronomic software and harvest equipment.
- New this year: Come enjoy a free baked potato bar at lunch on Wednesday January 22!

» https://www.uidaho.edu/cals/potatoes/news/idaho-potato-conference

Updated manual and resources now available to help navigate the 2019 Potato Sustainability Initiative (PSI) survey

Potato    All Locations

Potato Sustainability Initiative Survey

Posted on: October 25, 2019 by Nora Olsen

Updated manual and resources now available to help navigate the
2019 Potato Sustainability Initiative (PSI) survey

Potato growers—you will soon be asked to answer the annual Potato Sustainability Initiative (PSI) survey. Most process, and some fresh, growers are requested to participate in the PSI sustainability survey. Please note: there will be no audit for the 2019 survey.
In the past, approximately 20% of the growers who completed the survey were audited each year. The audit involved an interview between the grower and auditor with specific questions and an inspection of documents. A manual was developed to help growers methodically and successfully gather required documents for the audit, with examples of standard operating procedures, and resources to help answer interview questions. Audit information was retained in the manual as a reference and resource for future audits.
The manual is posted at https://www.uidaho.edu/cals/potatoes/food-and-farm-safety
The 2019 survey changed slightly from the 2018 survey.
The manual was developed by University of Idaho, Washington State University and IACI with funding from the NW Potato Research Consortium.

Call for Pink Rot

Potato    All Locations

Pink Rot (Phytophthora erythroseptica)

Posted on: September 6, 2019 by Jeff Miller

Miller Research has received funding to evaluate the pink rot pathogen (Phytophthora erythroseptica) for sensitivity to mefenoxam and phosphorous acid. If you observe pink rot, please send us samples. It is best to send tubers which are only partially decayed and still have some healthy tissue remaining. It is very difficult, if not impossible, to isolate the organism from completely rotted tubers.

Wrap tubers in dry paper towels and send them as quickly as possible to:
Miller Research
426 E 200 N
Rupert, ID 83350

Please contact Cheryn Clayton by phone (208-531-5124) or email (cheryn@millerresearch.com) to notify us that samples are being sent. If you have any questions, please feel free to contact me at 208-431-4420.

Good luck with harvest!

Jeff Miller

Psyllid update September 5 2019

Potato    All Locations

Potato Psyllid

Posted on: September 5, 2019 by Lucy Standley

This week we had traps deployed in 62 of the 79 fields (78.4%) monitored this year, and we found a total of 32 psyllids across 13 (16.4%) of the 79 monitored fields. Many of the 79 total fields that we were sampling have been vine-killed.

Psyllids were collected on sticky traps in potato in the following counties: Payette (1 field), Canyon (6 fields), Owyhee (2 fields), Twin Falls (2 fields), Jerome (1 field), and Power (1 field).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Our research with Russet Burbank in Idaho has shown that plants should be protected from infection with the ZC bacterium at least until one week before vine kill to reduce ZC symptoms. Therefore, we continue to urge growers to maintain their IPM programs.

We are not including “heat maps” this week given that they tend to show skewed patterns with smaller sample sizes.

Following recommendations from our ZC Advisory Committee last year, we shortened the duration of our monitoring program. This week we conclude the official monitoring program, though we will continue monitoring fields at the Kimberly Research & Extension Center as well as grower- and crop consultant-submitted samples. We will post any important updates that develop.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

2019 Vine Kill Recommendations - Late Blight infected and non-infected fields

Potato    All Locations

Vine Kill

Posted on: August 30, 2019 by Pamela Hutchinson

Information about vine kill with little or no mechanical operations (beating/flailing, splitting vines). Late blight spores can spread by mechanical vine kill. Use of only vine-kill chemical products can provide enough reduction of plant material for efficient harvest.

Psyllid abundance remains relatively steady

Potato    All Locations

potato psyllid

Posted on: August 29, 2019 by Erik Wenninger

This week we had traps deployed in 76 of the 79 fields (96.2%) monitored this year, and we found a total of 58 psyllids across 26 (32.9%) of the 79 monitored fields. Three of the 79 total fields that we were sampling have been vine-killed.

Psyllids were collected on sticky traps in potato in the following counties: Payette (3 fields), Canyon (10 fields), Elmore (4 fields), Twin Falls (4 fields), Jerome (2 fields), and Cassia (3 fields).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Overall psyllid captures have remained relatively steady over the last few weeks. However, we continue to urge growers to maintain their IPM programs.

“Heat maps” of this week’s results can be found on the UI and WSU websites linked below. The moderately “hot spot” observed during recent weeks in the western Treasure Valley remains, with another small area of moderate pressure south of Mountain Home.

This was the last sample week for quite a few of our fields, so we likely will not include heat maps next week given that they tend to be skewed with smaller sample sizes.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

Psyllid monitoring update 22 Aug 2019

Potato    All Locations

Potato Psyllid

Posted on: August 22, 2019 by Lucy Standley

This week we had traps deployed in 78 of the 79 fields (98.7%) monitored this year, and we found a total of 52 psyllids across 26 (32.9%) of the 79 monitored fields. One of the 79 total fields that we were sampling has been vine-killed.

Psyllids were collected on sticky traps in potato in the following counties: Payette (3 fields), Canyon (9 fields), Owyhee (2 fields), Elmore (1 field), Twin Falls (6 fields), Jerome (3 fields), Cassia (1 field), and Minidoka (1 field).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Overall psyllid captures have remained relatively steady over the last few weeks. However, we continue to urge growers to maintain their IPM programs.

“Heat maps” of this week’s results can be found on the UI and WSU websites linked below. The “hot spots” observed during recent weeks in the western Treasure Valley have diminished somewhat.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August22EastMap

» August22WestMap

August 2019 Idaho outbreak of potato late blight – further information and recommendations

Potato    All Locations

Late Blight

Posted on: August 22, 2019 by James Woodhall

Please see the attached sheets for more information on the current late blight outbreak in southern Idaho.

» Late_blight_2019_outbreak_info_(1).pdf

» Risk_levels.pdf

First call for topics for the 2020 Idaho Potato Conference

Potato    All Locations

Posted on: August 19, 2019 by Jerry Neufeld

This the first call for topics for the 2020 Idaho Potato Conference that will take place in Pocatello on January 22nd and 23rd. Please provide your ideas for potential workshops and presentations for this year's conference to Kasia Duellman (kduellman@uidaho.edu), Nora Oslen (norao@uidaho.edu) or Mike Thornton (miket@uidaho.edu) by September 16th so that we can put together a preliminary list for a program planning meeting. Please also take the time to survey your stakeholders for any input and indicate whether you would be interested and willing to present a workshop or seminar.

Thank you, and we look forward to seeing your responses.

Sincerely,

Kasia Duellman, Nora Olsen and Mike Thornton
Co-Chairs 2020 UI Potato Conference

August 15, 2019 Psyllid Monitoring Update

Potato    All Locations

Potato Psyllid

Posted on: August 15, 2019 by Lucy Standley

This week we had traps deployed in 76 of the 79 fields (96.2%) monitored this year, and we found a total of 55 psyllids across 24 (30.4%) of the 79 monitored fields. One of the 79 total fields that we were sampling has been vine-killed.

Psyllids were collected on sticky traps in potato in the following counties: Payette (2 fields), Canyon (11 fields), Owyhee (1 field), Elmore (1 field), Gooding (1 field), Twin Falls (5 fields), Jerome (1 field), Cassia (1 field) and, Minidoka (1 field).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Overall psyllid captures have remained relatively steady over the last few weeks. However, we continue to urge growers to maintain their IPM programs.

“Heat maps” of this week’s results can be found on the UI and WSU websites linked below. We continue to observe a “hot spot” in the western Treasure Valley.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August15EastMap

» August15WestMap

August 8, 2019 First psyllid in eastern Idaho this year

Potato    All Locations

Potato Psyllid

Posted on: August 8, 2019 by Lucy Standley

This week we had traps deployed in 78 of the 79 fields (98.7%) monitored this year, and we found a total of 73 psyllids across 27 (34.2%) of the 79 monitored fields. However, we are still waiting to receive traps from 3 sites in the Magic Valley. One of the 79 total fields that we were sampling has been vine-killed.

Psyllids were collected on sticky traps in potato in the following counties: Payette (3 fields), Canyon (9 fields), Elmore (2 fields), Gooding (1 field), Twin Falls (6 fields), Jerome (1 field), Cassia (2 fields), Minidoka (2 fields), and Bingham (1 field). This was our first capture of a potato psyllid this year in eastern Idaho, which consistently has shown later first incidence of psyllids and lower abundance overall.

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Psyllid captures have fluctuated only a bit over the past three weeks, and thankfully we have not observed hot psyllids since mid-July.

“Heat maps” of this week’s results can be found on the UI and WSU websites linked below. “Hot spots” continue to be observed in the western Treasure Valley.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August8EastMap

» August8WestMap

August 1, 2019 Psyllid captures declined a bit this week

Potato    All Locations

Potato Psyllid

Posted on: August 1, 2019 by Lucy Standley

This week we had traps deployed in 81 of the 82 fields (98.7%) monitored this year, and we found a total of 67 psyllids across 27 (32.9%) of the 82 monitored fields. However, we are still waiting to receive traps from 19 sites in eastern Idaho. One of the 82 total fields that we were sampling has been vine-killed.

Psyllids were collected on sticky traps in potato in the following counties: Payette (3 fields), Canyon (12 fields), Owyhee (1 field), Elmore (3 fields), Twin Falls (6 fields), Cassia (1 field), and Minidoka (1 field).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Psyllid captures dropped a bit relative to last week; however, we continue to urge growers to maintain their IPM programs, especially given that we have historically seen an increase in captures during August.

“Heat maps” of this week’s results will soon be included on the UI and WSU websites (see links below), pending resolution of technical difficulties we are currently having with them.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

2019 Miller Research Potato Pest Management Field Day

Potato    All Locations

Posted on: July 22, 2019 by Jeff Miller

Miller Research will be holding their annual potato pest management field day on Thursday, August 15 at the Miller Research facility located near Acequia, ID (426 E 200 N). The event is open to the public and there is no cost to attend.

Topics addressed on the tour will include:
• Susceptibility of varieties to disease with and without fungicide management.
• Fungicides for the control of early blight, brown spot, white mold, and black dot.
• Rhizoctonia management
• Fungicide programs for managing pink rot and Pythium leak
• Spore trapping for managing foliar diseases of potato

The presentations will focus on chemical management of diseases and will highlight research which has been funded by the Pacific Northwest Potato Research Consortium. ISDA pesticide recertification credits (2) and CCA Pest Management credits (2) have been awarded for this meeting.

In order to plan appropriately for lunch, please RSVP to by August 6 to Cheryn Clayton at 208-531-5124 or by email at cheryn@millerresearch.com.

» http://millerresearch.com/event/2019-miller-research-potato-pest-management-field-day/

July 18, 2019 First Lso-positive psyllids found in Idaho

Potato    All Locations

Potato Psyllid

Posted on: July 18, 2019 by Lucy Standley

This week we had traps deployed in 83 of the 83 fields (100%) monitored this year and we found a total of 59 psyllids across 29 (34.9%) of the 83 monitored fields.

Psyllids were collected on sticky traps in potato in the following counties: Payette (1 field), Canyon (11 fields), Elmore (3 fields), Twin Falls (10 fields), Jerome (3 fields), and Cassia (1 field).

From last week’s samples, 5 psyllids tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease (ZC). These hot psyllids were collected from one field in Payette County and two fields in Twin Falls County. In addition, one psyllid collected from a field in Canyon County in mid-June (before our monitoring program had officially started) tested positive for Lso.

Given the incidence of Lso observed in psyllids, we strongly urge growers and crop consultants to maintain their IPM programs.

We apologize for not having “heat maps” yet this week. We hope to have them generated before next week and posted on our website.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid monitoring program underway

Potato    All Locations

Potato Psyllid

Posted on: July 11, 2019 by Lucy Standley

The 2019 University of Idaho monitoring program for potato psyllids and liberibacter (Lso), the bacterium associated with zebra chip disease (ZC), is underway. Following recommendations from our ZC Advisory Committee last year, we shortened the duration of the program. We also plan to post weekly updates by Thursday each week instead of Friday.

This week, we collected 38 psyllids from sticky cards (across 20 sites).

Psyllids were collected on sticky traps in potato in the following counties: Payette (2 fields), Canyon (7 fields), Owyhee (2 fields), Elmore (3 fields), Twin Falls (3 fields), Jerome (2 fields), and Minidoka (1 field).

We had traps deployed in 53 of the 83 fields (63.8%) monitored this year and found psyllids in 19 of the monitored fields (37.7%).

During the previous week (before the monitoring program officially began), we collected 14 psyllids across 7 of 25 fields that were monitored (psyllids were captured in Payette, Canyon, and Owyhee counties).

All psyllids tested so far have been negative for Lso. Nevertheless, we urge growers and crop consultants to maintain their IPM programs.

“Heat maps” of this week’s results will not be made given that a relatively low number of psyllids and sites (traps in several fields were just deployed this week) tends to result in skewed maps.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

2019 Potato psyllid monitoring program in Idaho

Potato    All Locations

potato psyllid

Posted on: June 28, 2019 by Erik Wenninger

The University of Idaho, in collaboration with crop consultants across the state, will continue our monitoring program for potato psyllids, zebra chip disease, and liberibacter (Lso), the bacterium associated with zebra chip. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by the Idaho Potato Commission, USDA, and generous in-kind contributions by our collaborators.

Following recommendations from our ZC Advisory Committee last year, we are shortening the duration of the program. We still plan to monitor about 100 fields across the state, but only with 4 sticky traps per field rather than the more intense sampling that was conducted on some fields in the past.

The first official deployment of sticky traps for the program will occur next week. However, following earlier than usual observation of potato psyllids in Oregon, we began deploying traps on a limited basis over the last three weeks. During the week of June 10, we captured 22 potato psyllids across six fields in Canyon County and one psyllid in a field in Payette County. During the week of June 17, we captured one psyllid in each of two fields in Canyon County and three psyllids across two fields in Payette County. We have yet to observe potato psyllids in Twin Falls County after three weeks of monitoring in a few fields. Over the last two weeks, we found psyllids in 8 of 12 fields (67%) and 4 of 23 fields (17%) being monitored, respectively.

It should be noted that observation of potato psyllids in Idaho during June is not at all unexpected. We typically would find our first psyllids during mid-May.

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://www.uidaho.edu/cals/potatoes/news/psyllid-management

» http://www.uidaho.edu/cals/potatoes/news/psyllid-management

Potato Psyllids in the Treasure Valley

Potato    Treasure Valley

Posted on: June 14, 2019 by Stuart Reitz

Potato psyllids detected in the Treasure Valley.

The potato pest monitoring network in Malheur County found potato psyllids in 45% of checked fields last week (Traps were placed May 31 and collected June 7). A total of 21 psyllids were collected this past week from the 20 fields currently in the monitoring network. The psyllids will be tested for the Zebra Chip bacterium.

For information on psyllid and other pest management in potatoes, please see the 2019 Integrated Pest Management Guidelines for Insects and Mites in Idaho, Oregon and Washington Potatoes, available at http://www.nwpotatoresearch.com/pest-library/pest-management-options/.

» http://www.nwpotatoresearch.com/pest-library/pest-management-options/

Potato herbicide solubility and effects - Spring 2019

Potato    All Locations

Posted on: June 12, 2019 by Pamela Hutchinson

Rainfall across southern Idaho this spring has been unusually high in some areas and potato herbicides may have been or are being affected. Soluble herbicides can move downward in soil profile. Availability of herbicides for uptake can increase. What is happening with your potato herbicides and why? What is happening to your weeds and potatoes and why?

» Potato_herbicide_solubility_and_movement_-_Spring_2019.pdf

Annual University of Idaho Snake River Weed Management Tour - June 25th - Aberdeen R&E Center

Potato    All Locations

Posted on: May 30, 2019 by Pam Hutchinson

Greetings;



Please mark your calendars and plan to attend the UI Snake River Pest Management Tour at the Aberdeen R&E Center on Tuesday June 25th.

Time: 8:30 to noon followed by a sponsored lunch.

Credits: Three Idaho pesticide applicator recertification credits will be offered.



Featured will be several weed control trials in potatoes, including tank mixtures, planned vs. rescue postemergence applications, chemigation vs sprinkler incorporation as well as potato variety herbicide tolerance trials, herbicide mechanism of action plots, and Litchi tomato herbicide management.



We hope to see you there.



Thanks,

Pam

p.s. This tour was originally scheduled for June 18th but due to cold rainy conditions, our potato and weed emergence has been slowed considerably

There will be no Snake River Tour at the Kimberly R&E Center this year – we plan to fire it up again in 2020!

Cull Potato Management

Potato    All Locations

cull potato managment

Posted on: May 13, 2019 by Kasia Duellman

The Idaho State Department of Agriculture requires cull potatoes from all potato operations to be rendered non-viable on a daily basis after April 15th in western Idaho and after May 15th in eastern Idaho. Dr. Kasia Duellman, UI CALS Extension Seed Potato Specialist has provided additional information about cull potato management. Click of the pdf below for additional information.

» Cull_Potato_Management-Pest-Alert_SUBMITTED.pdf

2019 Miller Research Potato Pest Management Meeting Handouts

Potato    All Locations

Posted on: March 11, 2019 by Jeff Miller

Presentation handouts from the 2019 Miller Research Potato Pest Management Meeting Handouts are now available at MillerResearch.com (see the link below.)

» https://millerresearch.com/2018/11/mr-potato-pest-management-workshop-2-2/

2019 Miller Research Potato Pest Management Meeting

Potato    All Locations

Posted on: January 22, 2019 by Jeff Miller

Miller Research LLC will hold its annual potato pest management seminar Thursday, January 31, 2019, at the Historic Wilson Theater in Rupert (610 Fremont St).
Three CCA (Pest Management) credits and three Idaho Pesticide Recertification will be available. Please RSVP to Cheryn Clayton at cheryn@millerresearch.com.

The cost to attend the meeting is $10 and can be paid by check, cash, or credit card. After covering meeting costs, remaining funds will be donated to 4H.

We will provide snacks for the morning, but we are not providing lunch.

More information can be found in the attachment and at MillerResearch.com

» http://millerresearch.com/event/miller-research-potato-pest-management-workshop/

» SeminarFlier2019winter.pdf

Final 2018 psyllid monitoring update

Potato    All Locations

Potato Psyllid

Posted on: October 5, 2018 by Lucy Standley

This week we collected 2 psyllids from sticky traps in one intense field in Twin Falls County. We only had traps deployed in 2 fields given that all of the other fields in the monitoring program had been vine killed or harvested.

One of the psyllids collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. This is only the third psyllid this season to test positive, and this year still has shown the lowest overall incidence in Lso for any season we have been monitoring. Nevertheless, this finding underscores the importance of maintaining an IPM program through the end of the season. We have found that ZC can develop in tubers that were inoculated with Lso-positive psyllids as late as 2 weeks (and in rare cases 1 week) before vine kill.

This week’s report concludes the University of Idaho psyllid/Lso monitoring program. We will only provide an update next Friday if we detect Lso in the psyllids collected this week.

Thanks to all of the growers, crop consultants, and other industry folks who contributed to this work.

A summary of this year’s results is expected to be presented at the Idaho Association of Plant Protection meeting in Twin Falls in November and at the Idaho Potato Conference.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid update 28 September 2018

Potato    All Locations

Potato Psyllid

Posted on: September 28, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (3 fields) and Twin Falls (1 field).

This week, we collected 9 psyllids from sticky cards (across 4 intense sites).

Most of the 95 fields that were in the monitoring program have been vine killed or harvested. We had traps deployed in all 6 of the remaining fields and found psyllids in 4 of them (66.7%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence has been considerably lower than in all previous years. Nevertheless, we urge growers and crop consultants to maintain their IPM programs. We have found that ZC can develop in tubers that were inoculated with Lso-positive psyllids as late as 2 weeks (and in rare cases 1 week) before vine kill.

“Heat maps” of this week’s results will not be made given that the low number of sites remaining tends to result in skewed maps.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid update 21 September 2018

Potato    All Locations

potato psyllids

Posted on: September 21, 2018 by Erik Wenninger

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (4 fields), Jerome (1 field), and Twin Falls (1 field).

This week, we collected 40 psyllids from sticky cards (across 6 intense sites and 0 light sites). We also collected a few eggs and nymphs in leaf samples at two sites in Canyon County; when we have found immature psyllids in the past, they have typically occurred very late in the season as is the case here.

Most of the 95 fields that were in the monitoring program have been vine killed or harvested. We had traps deployed in all 14 of the remaining fields and found psyllids in 6 of them (43%). There are now just a handful of fields being monitored for next week’s report.

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence has been considerably lower than in all previous years. Nevertheless, we urge growers and crop consultants to maintain their IPM programs. We have found that ZC can develop in tubers that were inoculated with Lso-positive psyllids as late as 2 weeks (and in rare cases 1 week) before vine kill.

“Heat maps” of this week’s results will not be made given that the low number of sites remaining tends to result in skewed maps.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Call for Topics for the 2019 Idaho Potato Conference

Potato    All Locations

Posted on: September 17, 2018 by Kasia Duellman

This is the first call for topics for the 2019 Idaho Potato Conference that will take place in Pocatello on January 23 and 24, 2019 (Note: the ICIA Seed Seminar will be held the day before, as usual - January 22, and you are welcome to submit ideas for Seed Seminar as well).

Please provide your ideas for potential workshops and presentations for this year's conference to Kasia Duellman (kduellman@uidaho.edu) or Pam Hutchinson (phutch@uidaho.edu) by September 25th so we can put together a preliminary list for a program planning meeting to be held at a date in early October to be determined.

Psyllid update 14 September 2018

Potato    All Locations

Potato Psyllid

Posted on: September 14, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (4 fields), Twin Falls (2 fields), and Cassia (6 fields).

This week, we collected 84 psyllids from sticky cards (across 7 light sites and 5 intense sites).

Many of the 95 fields that were in the monitoring program are being vine killed or harvested. We had traps deployed in all 26 of the remaining fields and found psyllids in 12 of these 26 fields (46.2%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years. Nevertheless, we urge growers and crop consultants to have an IPM program in place.

“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.

With so few sites still being monitored this late in the season, it is possible that the heat maps may appear a bit skewed.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» Sept14EastMap

» Sept14WestMap

Psyllid update 7 September 2018

Potato    All Locations

Potato Psyllid

Posted on: September 7, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (2 fields), Twin Falls (1 field), and Cassia (4 fields).

This week, we collected 19 psyllids from sticky cards (across 4 light sites and 3 intense sites).

We had traps deployed in all 32 of the 32 fields (100%) monitored and found psyllids in 7 of the monitored fields (21.8%). 63 of the 95 total fields that we were sampling have been vine-killed.

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years. Nevertheless, we urge growers and crop consultants to have an IPM program in place.

“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» Sept7East

» Sept&West

Psyllid update 31 August 2018

Potato    All Locations

Potato Psyllid

Posted on: August 31, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (9 fields), Owyhee (2 fields), Elmore (1 field), Payette (1 field), Jerome (1 field) Twin Falls (2 fields), and Cassia (1 field).

This week, we collected 34 psyllids from sticky cards (across 13 light sites and 4 intense sites).

We had traps deployed in all 89 of the 89 fields (100%) monitored this year and found psyllids in 17 of the monitored fields (19.1%). Six of the 95 total fields that we were sampling have been vine-killed.

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years. Nevertheless, we urge growers and crop consultants to have an IPM program in place.

“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August31EastMap

» August31WestMap

Psyllid update 24 August 2018

Potato    All Locations

Potato Psyllid

Posted on: August 24, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (10 fields), Elmore (1 field), Twin Falls (2 fields), and Cassia (1 field).

This week, we collected 30 psyllids from sticky cards (across 9 light sites and 5 intense sites).

We had traps deployed in all 95 of the 95 fields (100%) monitored this year and found psyllids in 14 of the monitored fields (14.7%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years. Nevertheless, we urge growers and crop consultants to have an IPM program in place.

“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August24EastMap

» August24WestMap

Psyllid update 17 August 2018

Potato    All Locations

Potato Psyllid

Posted on: August 17, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (9 fields), Payette (1 field), Twin Falls (3 fields), Jerome (1 field), Cassia (1 field), and Bannock (1 field).

This week, we collected 36 psyllids from sticky cards (across 12 light sites and 4 intense sites).

We had traps deployed in all 95 of the 95 fields (100%) monitored this year and found psyllids in 16 of the monitored fields (16.8%). However, we are still waiting to receive card data from 4 sites.

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years. Nevertheless, we urge growers and crop consultants to have an IPM program in place.

“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August17EastMap

» August17WestMap

Psyllid update 10 August 2018

Potato    All Locations

Potato Psyllid

Posted on: August 10, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (10 fields), Payette (1 field), Twin Falls (1 field), Jerome (1 field), Cassia (3 fields), Minidoka (1 field), Power (1 field), and Oneida (1 field).

This week, we collected 36 psyllids from sticky cards (across 15 light sites and 4 intense sites).

We had traps deployed in all 95 of the 95 fields (100%) monitored this year and found psyllids in 19 of the monitored fields (20%). However, we are still waiting to receive card data from 3 sites.

This week we also collected one psyllid from vacuum sampling in one Canyon county field.

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Although psyllid numbers continue to be relatively low thus far this year, we are now starting to see a few more captures in eastern Idaho. With only two Lso-positive psyllids found to date, percent incidence is currently considerably lower than in most previous years.

Nevertheless, we urge growers and crop consultants to have an IPM program in place.

“Heat maps” of this week’s results will be included on the UI and WSU websites (see links below). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.
--WSU site: https://potatoes.decisionaid.systems/idaho

» http://www.uidaho.edu/cals/potatoes/news

» https://potatoes.decisionaid.systems/idaho

» August10EastMap

» August10WestMap

Psyllid update 3 August 2018

Potato    All Locations

potato psyllids

Posted on: August 3, 2018 by Erik Wenninger

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (12 fields), Cassia (1 field), Jerome (1 field), Payette (1 field), and Twin Falls (2 fields).

This week, we collected 32 psyllids from sticky cards (across 11 light sites and 6 intense sites).

We had traps deployed in all 96 of the 96 fields (100%) monitored this year and found psyllids in 17 of the monitored fields (17.7%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Psyllid numbers continue to be relatively low thus far this year. With only two Lso-positive psyllids found to date, percent incidence is currently lower than what has typically been found during most previous years.

Nevertheless, we urge growers and crop consultants to have an IPM program in place.

Included on the PNW Pest Alert version of this update (http://www.pnwpestalert.net/) is a “heat map” of this week’s results (only for the western half of the state; we captured only one psyllid in the eastern half this week). “Heat maps” describe predicted psyllid densities across the landscape, based on our trap counts and on predictive models developed over six years of psyllid monitoring in Idaho. These maps, developed in collaboration with WSU, should be used as a guideline, but not a definitive count of the number of insects in any given field at any given point in time. “Low,” “Moderate,” “High,” and “Very High” designations are arbitrary categories that illustrate relative abundance and should not be used as “thresholds.” More details on the “heat maps” can be found in Potato Progress Volume XVII, Number 2, 15 February 2017.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

Psyllid update July 27, 2018

Potato    All Locations

Potato Psyllid

Posted on: July 27, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (11 fields), Cassia (1 field), Minidoka (1 field), Payette (1 field), and Twin Falls (1 field).

This week, we collected 30 psyllids from sticky cards (across 13 light sites and 2 intense sites).

We had traps deployed in 96 of the estimated 96 fields (100%) monitored this year and found psyllids in 15 of the monitored fields (19.8%). However, we are still waiting to receive cards from 13 sites.

Testing of last week’s psyllids for Lso has been delayed due to the Potato Association of America meeting this week.

Psyllid numbers remain relatively low thus far this year. With two Lso-positive psyllids found to date, percent incidence is similar to what has typically been found during most previous years.

Nevertheless, we urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid update July 20, 2018

Potato    All Locations

Potato Psyllid

Posted on: July 20, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (10 fields), Cassia (3 fields), Elmore (1 field), Minidoka (2 fields), Payette (1 field), and Twin Falls (2 fields).

This week, we collected 29 psyllids from sticky cards (20 light sites and 9 intense sites).

We had traps deployed in 93 of the estimated 96 fields (96%) that will be monitored this year and found psyllids in 19 of the monitored fields (20.4%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Psyllid numbers remain relatively low thus far this year. With two Lso-positive psyllids found to date, percent incidence is similar to what has typically been found during most previous years.

Nevertheless, we urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Second Lso-positive potato psyllid this year

Potato    All Locations

Potato Psyllid

Posted on: July 13, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (8 fields), Cassia (3 fields), Owyhee (1 field), Jerome (2 fields), and Twin Falls (3 fields).

This week, we collected 31 psyllids from sticky cards (13 light sites and 4 intense sites).

We had traps deployed in 92 of the estimated 96 fields (96%) that will be monitored this year and found psyllids in 17 of the monitored fields (18.5%).

One psyllid collected last week in Canyon County tested positive for Lso (liberibacter), the bacterium that causes zebra chip.

Psyllid numbers remain relatively low thus far this year. With two Lso-positive psyllids found to date, percent incidence is similar to what has typically been found during most previous years.

Nevertheless, we urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

First Lso-positive potato psyllid

Potato    All Locations

Potato Psyllid

Posted on: July 6, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (4 fields), Owyhee (2 fields), Gooding (1 field), and Twin Falls (1 field).

This week, we collected 13 psyllids from sticky cards (7 light sites and 1 intense site).

We had traps deployed in 93 of the estimated 97 fields (95%) that will be monitored this year and found psyllids in 8 of the monitored fields (8.6%). However, we are still waiting to receive cards from 8 sites.

One psyllid collected last week in Canyon County tested positive for Lso (liberibacter), the bacterium that causes zebra chip.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid abundance remains relatively low

Potato    All Locations

Potato Psyllid

Posted on: June 29, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (6 fields), Owyhee (1 field), and Twin Falls (2 fields).

This week, we collected 16 psyllids from sticky cards (8 light sites and 1 intense site).

We had traps deployed in 85 of the estimated 97 fields (87%) that will be monitored this year and found psyllids in 9 of the monitored fields (10.5%). However, we are still waiting to receive cards from 4 sites.

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Thus far, psyllid abundance has been relatively low this year; however, potato psyllid abundance typically increases during July through August.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

A few more psyllids found in Treasure and Magic Valleys

Potato    All Locations

Potato Psyllid

Posted on: June 22, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (3 fields), Jerome (1 field), and Twin Falls (1 field).

This week, we collected 10 psyllid from sticky cards (3 light sites and 2 intense sites).

We had traps deployed in 85 of the estimated 97 fields (87%) that will be monitored this year and found psyllids in 5 of the monitored fields (5.8%). However, we are still waiting to receive cards from 19 sites.

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

First potato psyllid found in Magic Valley

Potato    All Locations

Potato Psyllid

Posted on: June 15, 2018 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (3 fields), Owyhee (1 field), and Twin Falls (1 field).

This week, we collected 6 psyllid from sticky cards (5 light sites).

We had traps deployed in 75 of the estimated 85 fields (88%) that will be monitored this year and found psyllids in 5 of the monitored fields (5.8%).

The psyllid collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Another psyllid found in Treasure Valley; none in Magic Valley

Potato    All Locations

Potato Psyllid

Posted on: June 8, 2018 by Lucy Standley

One potato psyllid was collected on a sticky trap in potato in the following county: Canyon (1 field).

This week, we collected one psyllid from sticky cards (1 light site).

We had traps deployed in 50 of the estimated 89 fields (56%) that will be monitored this year and found one psyllid in one of the monitored fields (2%).

The psyllid collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

First potato psyllid found in Idaho potato fields this season

Potato    All Locations

Potato Psyllid

Posted on: June 1, 2018 by Lucy Standley

One potato psyllid was collected on a sticky trap in potato in the following county: Canyon (1 field).

This week, we collected one psyllid from sticky cards (1 light site).

We had traps deployed in 50 of the estimated 88 fields (57%) that will be monitored this year and found one psyllid in one of the monitored fields (1.13%).

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

2018 Potato psyllid monitoring program underway in Idaho

Potato    All Locations

Potato Psyllid

Posted on: May 25, 2018 by Lucy Standley

The University of Idaho, in collaboration with Miller Research and several crop consultants across the state will continue our monitoring program for potato psyllids, zebra chip, and liberibacter (Lso), the bacterium that causes zebra chip. The monitoring program covers commercial potato fields throughout southern Idaho and currently is funded in part by USDA and generous in-kind contributions by our collaborators.

The first deployment of sticky cards occurred last week in 17 Treasure Valley sites and 21 Magic Valley sites. Next week we expect to initiate sampling in 8 and 17 additional fields in the Treasure and Magic valleys, respectively.

This week we collected our first sticky cards of the season from potato fields. No potato psyllids were found in potato fields this week.

More details on the program will be forthcoming as we continue to ramp up sampling efforts. We hope to maintain a monitoring program at a level similar to recent years, but the breadth of the program this year will depend on funding that is still pending.

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://www.uidaho.edu/cals/potatoes/news/psyllid-management

» http://www.uidaho.edu/cals/potatoes/news

Potato Virus Detection Training Workshops

Potato    All Locations

Posted on: April 16, 2018 by Nora Olsen

Due to the success of our Potato Virus Detection Training Workshop at Othello WA in 2016, we are hosting another set of workshops in 2018 at three locations: Othello WA, Antigo WI and Presque Isle ME. These workshops will cover field identification of PVY (strains O, N-Wi and NTN), including visual identification of foliar symptoms on 20 cultivars commonly grown in each region. Recent standardization of seed certification programs across the U.S. includes the requirement for documentation of inspector training. However, this training will also be beneficial to growers, people who rogue, and those in the potato industry in general. We expect a high attendance rate so please sign up early! Locations, dates and times are listed below. Additional details can be found on our registration page Potato Virus Detection Training Workshop Registration.

Othello, WA
Date/Time: Thursday June 21, 2018. This workshop will be integrated into the Washington State University Potato Field Day, 8:30 a.m. to 1 p.m.
Location: Washington State University Research Farm, 1471 West Cox Road, Othello, WA
You are also invited to these events held nearby:
• Tuesday June 19, Final WA Commercial Potato Seed Lot Reading for 2018, 1471 West Cox Road, Othello, WA, 8:30 a.m. to 2:30 p.m.
• Wednesday June 20, Oregon State University Potato Field Day, OSU Research and Extension Center, 2121 South 1st Street, Hermiston, OR

Antigo, WI
Date/Time: Thursday July 26, 2018, 9:30 to 11:30 a.m. in advance of the Langlade Ag Research Station County Field Day, 1 to 3:30 p.m.
Location: University of Wisconsin Langlade Agricultural Research Station, Langlade County Airport, N3689 Langlade Road, Antigo, WI

Presque Isle, ME
Date/Time: Tuesday July 10, 2018, 10 a.m. to 12 p.m. for inspectors and 2 to 4 p.m. for growers and field staff, with a rain date on Thursday July 12.
Location: University of Maine Aroostook Farm, 59 Houlton Road, US Route 1, Presque Isle, Maine

University and USDA experts will be available at each location to give you a tour and answer your questions. These workshops are part of a USDA NIFA Specialty Crops Initiative award #2014-51181-22373 titled “Biological and economic impacts of emerging potato tuber necrotic viruses and the development of comprehensive and sustainable management practices”.

To register for the event please visit Potato Virus Detection Training Workshop Registration.
For more information about the workshop please email pbg-potatovirus@cornell.edu.

Updated manual and resources now available to help navigate the Potato Sustainability Initiative (PSI) survey and audit

Potato    All Locations

Posted on: February 23, 2018 by Nora Olsen

Updated manual and resources now available to help navigate the Potato Sustainability Initiative (PSI) survey and audit

Announcements recently went out on whether you will be audited in person for your 2017 responses to the Potato Sustainability Initiative (PSI) survey. Most process growers are requested to participate in the PSI sustainability survey and approximately 20% of the growers who completed the survey will be audited each year. The audit involves an interview between the grower and auditor with specific questions and an inspection of documents. A manual has been developed to help growers methodically and successfully gather required documents for the audit, with examples of standard operating procedures, and resources to help answer interview questions. The manual is posted at http://www.uidaho.edu/cals/potatoes. Changes to this manual will be done periodically to adjust for changes to the PSI survey. Note that the survey and audit changed from the previous year. The manual was developed by University of Idaho, Washington State University and IACI with funding from the NW Potato Research Consortium.

» http://www.uidaho.edu/cals/potatoes

End of psyllid monitoring in Idaho for the 2017 season

Potato    All Locations

Potato Psyllid

Posted on: October 5, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Gooding (1 field), Twin Falls (1 field), Jerome (1 field), and Bannock (1 field).

This week, we collected 22 psyllids from sticky cards (all from Intense sites).

Nearly all of the 95 fields that were in the monitoring program have been harvested. We had traps deployed in the 7 remaining fields and found psyllids in 4 of them.

Thus far, all psyllids collected last week tested negative for Lso (liberibacter), the bacterium associated with zebra chip disease.

This is the last week of psyllid monitoring in potato fields for this season. Thankfully psyllid numbers were far lower than last year, and Lso incidence thus far has been lower than we’ve ever recorded for a season.

We are extremely grateful to all of the growers, crop consultants, and other cooperators who helped with this project.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid monitoring update, 29 September 2017

Potato    All Locations

Potato Psyllid

Posted on: September 29, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (1 field), Gooding (1 field), Jerome (1 field), and Bannock (1 field).

This week, we collected 7 psyllids from sticky cards (1 from Light site and 6 from Intense sites).

Nearly all of the 95 fields that were in the monitoring program have been harvested. We had traps deployed in the 7 remaining fields and found psyllids in 4 of them.

Thus far, all psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. However, with the increased trap captures during recent weeks, some psyllids remain to be tested.

We expect to close out this year’s monitoring program within the next 2-3 weeks.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Temperatures and psyllid abundance decrease

Potato    All Locations

Potato Psyllid

Posted on: September 22, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (3 fields) Gooding (1 field), and Power (1 field).

This week, we collected 50 psyllids from sticky cards (all from Intense sites).

Many of the 95 fields that were in the monitoring program are being vine killed or harvested. We had traps deployed in 19 of the remaining fields and found psyllids in 5 of these 19 fields (26.3%). However, we are waiting to receive cards from an additional 21 Light sites.

Thus far, all psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip. However, with the increased trap captures during the last two weeks, some psyllids remain to be tested.

The dip in psyllid captures is almost certainly related to the cooler, rainy weather (in addition to the fact that fewer fields are still being monitored). Despite the rise in psyllid abundance during the previous 2-3 weeks, Lso incidence remains far lower than we’ve ever recorded for a season. Risk of ZC continues to appear relatively low as the season winds down.

We expect all of the remaining fields being monitored to undergo vine kill within the next two weeks.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid captures continue to rise, but season Lso incidence still remains low

Potato    All Locations

Potato Psyllid

Posted on: September 15, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Payette (1 field), Canyon (9 fields), Elmore (1 field), Gem (1 field), Gooding (1 field), Twin Falls (5 fields), Jerome (2 fields), Minidoka (1 field), Cassia (7 fields), and Power (2 fields).

This week, we collected 243 psyllids from sticky cards (94 from Light sites and 149 from Intense sites).

Many of the 95 fields that were in the monitoring program are being vine killed or harvested. We had traps deployed in all 70 of the remaining fields and found psyllids in 30 of these 70 fields (42.8%).

This week we found 39 nymphs in leaf samples from one site in Canyon county.

Thus far, all psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Although psyllid abundance is rising, Lso incidence remains far lower than we’ve ever recorded for a season.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid captures continue to rise, but season Lso incidence remains low

Potato    All Locations

Potato Psyllid

Posted on: September 8, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Payette (1 field), Canyon (10 fields), Elmore (2 fields), Gem (1 field), Gooding (1 field), Twin Falls (5 fields), Jerome (3 fields), Cassia (3 fields), Power (1 fields), and Bingham (1 field).

This week, we collected 126 psyllids from sticky cards (70 from Light sites and 56 from Intense sites).

Many of the 95 fields that were in the monitoring program are being vine killed or harvested. We had traps deployed in all 67 of the remaining fields and found psyllids in 28 of these 67 fields (41.8%). However, we are still waiting to receive cards from 10 light sites.

This week we found 3 nymphs in leaf samples from Canyon county and 4 adults in vacuum samples from Gooding and Twin Falls counties. This is the first incidence of immature psyllids in our samples this year, which is not surprising at this point in the season.

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

The late-season rise in psyllid captures is consistent with the general pattern we’ve observed for the last five years. However, overall psyllid abundance is still only about 5-10% of what we saw last year at this time, and Lso incidence so far is lower than we’ve ever recorded for a season (1.33%).

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Uptick in psyllid abundance as season winds down

Potato    All Locations

Potato Psyllid

Posted on: September 1, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (9 fields), Gem (1 field), Gooding (1 field), Twin Falls (7 fields), Jerome (2 fields), Cassia (1 field), Power (2 fields), and Bingham (1 field).

This week, we collected 59 psyllids from sticky cards (39 from Light sites and 20 from Intense sites).

As the season winds down, some of the 95 fields that were in the monitoring program are being vine killed or harvested. We had traps deployed in all 88 of the remaining fields and found psyllids in 24 of these 88 fields (27.2%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Typically we see a spike in psyllid abundance during late August to September, which may explain the uptick in psyllid numbers this week. However, overall psyllid abundance is still only about 5-10% of what we saw last year at this time.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid monitoring update, 25 August 2017

Potato    All Locations

Potato Psyllid

Posted on: August 25, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Payette (1 field), Canyon (6 fields), Gem (1 field), Gooding (1 field), Twin Falls (5 fields), Jerome (2 fields), Minidoka (1 field), and Power (1 field).

This week, we collected 32 psyllids from sticky cards (22 from Light sites and 10 from Intense sites).

As the season winds down, some of the 95 fields that were in the monitoring program are being vine killed or harvested. We had traps deployed in 91 of the 92 remaining fields and found psyllids in 18 of these 91 fields (19.8%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Typically we see a spike in psyllid abundance during late August to September, but this continues to be a relatively “quiet” year for potato psyllids. We will have to wait and see what the coming weeks bring.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid monitoring update, 18 August 2017

Potato    All Locations

Potato Psyllid

Posted on: August 18, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Owyhee (1 field), Canyon (5 fields), Gooding (1 field), Twin Falls (5 fields), Jerome (2 fields), Minidoka (1field), Cassia (1 field), and Power (2 fields).

This week, we collected 33 psyllids from sticky cards (23 from Light sites and 10 from Intense sites).

We had traps deployed in 93 of the 95 fields that are being monitored this year and found psyllids in 18 of these 93 fields (19.3%).

Thus far, all psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

This continues to be a relatively “quiet” year for potato psyllids. For perspective, during August last year we were collecting hundreds of psyllids per week with similar sampling effort.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Potato psyllid monitoring update, 11 August 2017

Potato    All Locations

potato psyllids

Posted on: August 11, 2017 by Erik Wenninger

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (9 fields), Elmore (1 field), Twin Falls (2 fields), Jerome (1 field), Minidoka (1field), and Power (1 field).

This week, we collected 26 psyllids from sticky cards (22 from Light sites and 4 from Intense sites).

We had traps deployed in 91 of the 95 fields that are being monitored this year and found psyllids in 15 of these 91 fields (16.5%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

This continues to be a relatively “quiet” year for potato psyllids. For perspective, during August last year we were collecting hundreds of psyllids per week with similar sampling effort.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

First Lso-positive psyllid collected in Treasure Valley this year

Potato    All Locations

Potato Psyllid

Posted on: August 4, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (5 fields), Gem (1 field), Elmore (1 field), Twin Falls (4 fields), Jerome (2 fields), Minidoka (2 fields), Cassia (4 fields), and Bannock (1 field).

This week, we collected 35 psyllids from sticky cards (23 from Light sites and 12 from Intense sites).

We had traps deployed in 92 of the 95 fields that are being monitored this year and found psyllids in 20 of these 92 fields (21.7%).

One psyllid collected last week in Canyon County tested positive for Lso (liberibacter), the bacterium that causes zebra chip. This is our first hot psyllid in the Treasure Valley this year and our fifth hot psyllid collected this year on sticky traps in commercial potato fields. Thus far this year, 2.3% of the psyllids we have collected on sticky traps have tested positive for Lso. This percentage is higher than last year, though the total number of psyllids collected this year has been far lower than last.

We continue to urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid monitoring update, 28 July 2017

Potato    All Locations

Potato Psyllid

Posted on: July 28, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (5 fields), Gem (1 field), Elmore (1 field), Twin Falls (5 fields), Gooding (1 field), Jerome (1 field), Cassia (2 fields), Power (1 field), and Bannock (1 field).

This week, we collected 24 psyllids from sticky cards (19 from Light sites and 5 from Intense sites).

We had traps deployed in 94 of the 95 fields that are being monitored this year and found psyllids in 24 of these 94 fields (25.5%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

We continue to urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Psyllid monitoring update, 21 July 2017

Potato    All Locations

Potato Psyllid

Posted on: July 21, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (4 fields), Gooding (1 field), Jerome (2 fields), Twin Falls (3 fields), Minidoka (1 field), Cassia (4 fields), Bingham (1 field), and Power (6 fields).

This week, we collected 33 psyllids from sticky cards (22 from Light sites and 11 from Intense sites).

We had traps deployed in 94 of the 95 fields that are being monitored this year and found psyllids in 22 of these 94 fields (23.4%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip.

Overall psyllid numbers have been increasing during the past few weeks, which is not surprising given that psyllids tend to become more abundant later during the season. We continue to urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

Lso-positive psyllids in Jerome and Twin Falls counties

Potato    All Locations

Potato Psyllid

Posted on: July 14, 2017 by Lucy Standley

Three psyllid collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Two of these psyllids were found in Jerome County, the other was found in Twin Falls County.

Psyllids were collected this week on sticky traps in potato in the following counties: Canyon (1 field) Elmore (1 field), Gooding (2 fields), Jerome (3 fields), Twin Falls (6 fields), Minidoka (2 fields), Cassia (4 fields), Bingham (1 field), and Power (7 fields).

This week, we collected 58 psyllids from sticky cards (31 from Light sites and 27 from Intense sites).

We had traps deployed in 93 of the 96 fields that are being monitored this year and found psyllids in 27 of these 93 fields (29%).

Overall psyllid numbers have been increasing during the past few weeks, which is not surprising given that psyllids tend to become more abundant later during the season. It is a little unusual that we are finding more psyllids in the Magic Valley than the Treasure Valley, which is opposite of the pattern we have observed over the last four years. Given the slight uptick in psyllid numbers and Lso incidence, we continue to urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

First Lso-positive psyllid found in Power County this year

Potato    All Locations

potato psyllids

Posted on: July 7, 2017 by Erik Wenninger

One psyllid collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. This psyllid was found in a field in Power County.

Psyllids were collected this week on sticky traps in potato in the following counties: Gooding (1 field), Jerome (5 fields), Twin Falls (2 fields), Minidoka (3 fields), Cassia (5 fields), and Power (4 fields).

This week, we collected 31 psyllids from sticky cards (21 from Light sites and 10 from Intense sites).

We had traps deployed in 95 of the 96 fields that are being monitored this year and found psyllids in 20 of these 95 fields (21.1%).

As always, we urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

June 30, 2017 – More psyllids found in Treasure and Magic Valleys

Potato    All Locations

Potato Psyllid

Posted on: June 30, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Jerome (1 field), Cassia (1 field), Canyon (2 fields), and Minidoka (1 field).

This week, we collected 9 psyllids from sticky cards (3 from Light sites and 6 from Intense sites).

We had traps deployed in 93 of the estimated 96 fields (96.8%) that will be monitored this year and found psyllids in 5 of these 93 fields (5.3%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip

As always, we urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

First potato psyllid found in Eastern Idaho during 2017 monitoring

Potato    All Locations

Potato Psyllid

Posted on: June 23, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Twin Falls (2 fields), Cassia (1 field), Power (1 field), and Minidoka (1 field).

This week, we collected 7 psyllids from sticky cards (6 from Light sites and 1 from Intense sites).

We had traps deployed in 93 of the estimated 96 fields (96.8%) that will be monitored this year and found psyllids in 5 of these 93 fields (5.3%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip

As always, we urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

June 16, 2017 – More potato psyllids found in Magic Valley

Potato    All Locations

Potato Psyllid

Posted on: June 16, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Twin Falls (1 field) and Jerome (1 field).

This week, we collected 2 psyllids from sticky cards (1 from Light sites and 1 from Intense sites).

We had traps deployed in 78 of the estimated 96 fields (81.2%) that will be monitored this year and found psyllids in 2 of these 78 fields (2.5%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip

As always, we urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

First potato psyllids found in Treasure Valley

Potato    All Locations

Potato Psyllid

Posted on: June 9, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Cassia (1 field) and Canyon (2 fields).

This week, we collected 3 psyllids from sticky cards (1 from Light sites and 2 from Intense sites).

We had traps deployed in 67 of the estimated 96 fields (69.7%) that will be monitored this year and found psyllids in 3 of these 67 fields (4.4%).

All psyllids collected last week tested negative for Lso (liberibacter), the bacterium that causes zebra chip

As always, we urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

More potato psyllids found in Magic Valley

Potato    All Locations

Potato Psyllid

Posted on: June 2, 2017 by Lucy Standley

Psyllids were collected this week on sticky traps in potato in the following counties: Gooding (1 field), Jerome (1 field), and Minidoka (1 field).

This week, we collected 6 psyllids from sticky cards (2 from Light sites and 4 from Intense sites).

We had traps deployed in 57 of the estimated 83 fields (68.6%) that will be monitored this year and found psyllids in 3 of these 57 fields (5.2%).

As always, we urge growers and crop consultants to have an IPM program in place.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

First Lso-positive potato psyllid found in Idaho this season

Potato    All Locations

potato psyllids

Posted on: June 1, 2017 by Erik Wenninger

One psyllid collected last week from a yellow sticky card deployed at the Kimberly Research & Extension Center tested positive for Lso (liberibacter), the bacterium associated with zebra chip disease. No psyllids collected from commercial fields tested positive.

On Friday we will post details on our monitoring results from this week.

We continue to urge growers and crop consultants to implement IPM programs for zebra chip.

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

May 26, 2017 First potato psyllids found in Idaho potato fields this season

Potato    All Locations

Potato Psyllid

Posted on: May 26, 2017 by Lucy Standley

We retrieved our first set of sticky traps from potato fields this season and found on these cards our first potato psyllids for the 2017 potato season.

Potato psyllids were collected on sticky traps in potato in the following counties: Twin Falls (1 field), Minidoka (2 fields).

This week, we collected 3 psyllids from sticky cards (2 from Light sites and 1 from Intense sites).

We had traps deployed in 17 of the estimated 73 fields (23%) that will be monitored this year and found psyllids in 3 of the monitored fields (17.6%).

More information can be found here: http://www.uidaho.edu/cals/potatoes/news
--Click on the links under “Updated weekly reports” for details on trap captures in Intense and Light sites.
--Click on the “Psyllid Management” link on the left panel for information on psyllid and zebra chip biology and management.

» http://www.uidaho.edu/cals/potatoes/news

2017 Potato psyllid monitoring program underway in Idaho

Potato    All Locations

potato psyllids

Posted on: May 18, 2017 by Erik Wenninger

The University of Idaho, in collaboration with Miller Research and several crop consultants across the state will continue our monitoring program for potato psyllids, zebra chip, and liberibacter (Lso), the bacterium that causes zebra chip. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by IPC, USDA, and generous in-kind contributions by our collaborators.

The first deployment of sticky cards occurred this week in 12 Treasure Valley sites and 21 Magic Valley sites. Next week we expect to initiate sampling in 15 and 20 additional fields in the Treasure and Magic valleys, respectively.

More details on the program will be forthcoming as we continue to ramp up sampling efforts. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://www.uidaho.edu/cals/potatoes/news/psyllid-management

» http://www.uidaho.edu/cals/potatoes/news/psyllid-management

2017 Idaho Potato Conference

Potato    All Locations

Posted on: November 28, 2016 by Jeff Miller

The 49th Idaho Potato Conference and 38th Ag Expo will be held January 17, 18, and 19, 2017 at Idaho State University. An announcement and registration form are attached. Also, the link to the conference web page is included below.

» https://www.uidaho.edu/cals/potatoes/conferences/idaho-potato-conference

» 2017 Idaho Potato Conference registration

Miller Research Potato Pest Management Seminar

Potato    All Locations

Posted on: November 15, 2016 by Jeff Miller

Miller Research LLC will be holding its annual potato pest management seminar on January 10, 11, and 12. The same program will be held each day. Seating in each session is limited to 50. The meetings will be held at the Miller Research facility located near Rupert, ID (426 E 200 N). Lunch will be provided at no cost. See the attached flier for the agenda. Please RSVP as to which session you would like to attend to Jeff Miller at 208-531-5124 or by email at: jeff@millerresearch.com. ISDA pesticide recertification credits and CCA credits (Integrated Pest Management) have been requested. Please share this notice with any interested parties.

» MillerResearchWorkshop.pdf

Potato psyllid monitoring winds down

Potato    All Locations

potato psyllids

Posted on: September 23, 2016 by Erik Wenninger

September 23, 2016 – Potato psyllid monitoring winds down

As many fields have been vine killed and/or harvested, the psyllid sampling season is winding down. Sampling continued in only a handful of fields this week and will all but cease next week.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Gooding (1 field), Twin Falls (1 field), Jerome (2 fields), Minidoka (1 field), and Cassia (4 fields).

This week, we collected 44 psyllids from sticky cards (37 from Light sites and 7 from Intense sites). We found psyllids in 8 of the 10 fields (80%) that were sampled this week. Total captures declined in part because sampling has ceased in most fields and likely also because of cooler weather.

We ran Lso testing on a subset of psyllids collected last week (up to ten psyllids per site). So far, none of the psyllids tested last week was positive for Lso. As always, the online spreadsheets (see below) may be updated at any time during the week as more data are gathered.

As fields are harvested, we urge everyone to familiarize themselves with ZC tuber symptoms. See link below for description and photos of ZC symptoms, and please take suspicious samples to the Kimberly R&E Center or to your local UI Extension Center.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

Psyllid captures continue to decline

Potato    All Locations

potato psyllids

Posted on: September 16, 2016 by Erik Wenninger

Potato psyllids were collected this week on sticky traps in potato in the following counties: Payette (1 field), Owyhee (1 field), Canyon (9 fields), Ada (2 fields), Elmore (1 field), Gooding (2 fields), Twin Falls (8 fields), Jerome (5 fields), Minidoka (2 fields), and Cassia (7 fields). Additionally, from one field in Gooding County, we captured 4 adults in a vacuum sample and 2 nymphs in a leaf sample.

This week, we collected 548 psyllids from sticky cards (254 from Light sites and 294 from Intense sites). Of the total 552 psyllids captured this week, 198 came from the Treasure Valley. We found psyllids in 38 of the 51 fields (75%) that were sampled this week. Total captures are declining in part because sampling has ceased in many fields (due to vine kill or harvest) and likely also because of cooler weather.

We ran Lso testing on a subset of psyllids collected last week (up to ten psyllids per site). So far, none of the psyllids tested last week was positive for Lso. About 50% of samples remain to be tested, and we expect to have those Lso results early next week. As always, the online spreadsheets (see below) may be updated at any time during the week as more data are gathered.

We continue to urge growers to maintain their IPM programs, especially in late-maturing fields, and to be on the lookout for plants exhibiting ZC symptoms. Foliar symptoms need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

Psyllid numbers tick down slightly

Potato    All Locations

potato psyllids

Posted on: September 9, 2016 by Erik Wenninger

Potato psyllids were collected this week on sticky traps in potato in the following counties: Payette (1 field), Owyhee (5 fields), Canyon (9 fields), Ada (2 fields), Elmore (1 field), Gooding (2 fields), Twin Falls (9 fields), Jerome (7 fields), Blaine (1 field), Minidoka (6 fields), Cassia (5 fields), and Bingham (1 field). Additionally, potato psyllid nymphs (37 total) were captured on leaf samples from Canyon County (2 fields) and Ada County (2 fields), and 30 potato psyllid adults were captured in vacuum samples taken from two Intense fields in Canyon counties.

This week, we collected 1,116 psyllids from sticky cards (824 from Light sites and 292 from Intense sites). Of the total 1,116 psyllids captured this week, 674 came from the Treasure Valley. We found psyllids in 40 of the 49 fields (82%) that were sampled this week. To put these numbers into perspective, we captured a total of approximately 1,100 psyllids for the entire year during each of the 2013 and 2015 seasons.

With the recent increase in psyllid numbers and attrition of our summer help, we ran Lso testing on a subset of psyllids collected last week (up to ten psyllids per site). So far, none of the psyllids tested last week was positive for Lso. About 50% of samples remain to be test, and we expect to have those Lso results early next week. As always, the online spreadsheets (see below) may be updated at any time during the week as more data are gathered.

Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following infection, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

September 2, 2016 – Psyllid numbers continue to rise

Potato    All Locations

potato psyllids

Posted on: September 2, 2016 by Amy Carroll

The two fields in western Idaho that were reported two weeks ago to exhibit high incidence of ZC symptoms were found to be negative for ZC after molecular testing. Stem-end discoloration appears to be prevalent this year, and that might explain the misdiagnosis by field personnel. The symptomatic plants observed by Kimberly R&amp;E Center staff did test positive for ZC, so we do have confirmed ZC at least in the Magic Valley.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (1 field), Gooding (2 fields), Twin Falls (8 fields), Jerome (9 fields), Blaine (1 field), Minidoka (3 fields), Cassia (5 fields), and Power (1 field).. Additionally, potato psyllid nymphs (9 total) were captured on leaf samples from Ada County (2 fields) and Jerome County (1 field), and 24 potato psyllid adults were captured in vacuum samples taken from three Intense fields in Canyon and Gooding counties.

This week, we collected 1,539 psyllids from sticky cards (1,138 from Light sites and 401 from Intense sites). Of the total 1,563 psyllids captured this week, 1,382 came from the Treasure Valley. We found psyllids in 54 of the 82 fields (66%) that were sampled this week. To put these numbers into perspective, we captured a total of approximately 1,100 psyllids for the entire year during each of the 2013 and 2015 seasons.

With the recent increase in psyllid numbers and attrition of our summer help, we ran Lso testing on a subset of psyllids collected last week (up to ten psyllids per site). So far, none of the psyllids tested last week was positive for Lso. About 50% of samples remain to be test, and we expect to have those Lso results early next week.

Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following infection, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&amp;E Center or to your local UI Extension Center.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

Harvest and Minimizing Foreign Material in Potatoes: On-line educational videos now available.

Potato    All Locations

Posted on: August 30, 2016 by Nora Olsen

Harvest and Minimizing Foreign Material: On-line educational videos now available.

Foreign material is any material that is not the potato tuber. It is "trash" or "garbage" in potatoes. Many foreign materials originate in the field, but others enter the product stream through equipment and during storage and handling. Whether potatoes are destined for the fresh market or processing, foreign material is a great concern to the Idaho potato industry. By minimizing foreign material in the field, in storage, and in the processing plant, growers and processors help maintain a high-quality product, safe standards, and consumer confidence.

The video “Continuing to Manage Foreign Material for Quality Idaho Potatoes” outlines ways you can reduce unwanted or foreign material in your potatoes. The video (English and Spanish version) are available on-line at:

Spanish edition:
https://vimeo.com/144655993

English edition:
https://vimeo.com/144567198

Additional information “Managing Foreign Material for Quality Idaho Potatoes” is available at http://www.uidaho.edu/cals/potatoes/research/storage/potato-storage-management.

» https://vimeo.com/144567198

» https://vimeo.com/144655993

» http://www.uidaho.edu/cals/potatoes/research/storage/potato-storage-management.

Psyllid numbers remain high

Potato    All Locations

potato psyllids

Posted on: August 26, 2016 by Erik Wenninger

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (1 field), Gooding (2 fields), Twin Falls (7 fields), Jerome (6 fields), Minidoka (2 fields), and Cassia (4 fields). Additionally, potato psyllid nymphs (8 total) were captured on leaf samples from Ada County (2 fields) and Canyon County (1 field), and 42 potato psyllid adults were captured in vacuum samples taken from four Intense fields in Canyon and Ada counties.

This week, we collected 957 psyllids from sticky cards (727 from Light sites and 230 from Intense sites). Of the total 999 psyllids captured this week, 950 came from the Treasure Valley. We found psyllids in 46 of the 99 fields (46%) that were sampled this week. To put these numbers into perspective, we captured a total of approximately 1,100 psyllids for the entire year during each of the 2013 and 2015 seasons.

With the recent increase in psyllid numbers and attrition of our summer help, we ran Lso testing on a subset of psyllids collected last week (up to ten psyllids per site). So far, none of the psyllids tested last week was positive for Lso. About 25% of samples remain to be test, and we expect to have those Lso results early next week.

We scouted a few fields in the Magic Valley that have had Lso-positive psyllids this year and found no evidence of zebra chip in the plants that we sampled. This is encouraging. However, because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following infection, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

ZC found in Magic Valley

Potato    All Locations

Posted on: August 24, 2016 by Erik Wenninger

A potato field in the Magic Valley was found to have potato plants exhibiting classic ZC symptoms in both the tubers and foliage. Tubers are being sent for confirmation by moleculr testing. Given that we have now found ZC in both the Treasure and Magic Valleys and have been capturing relatively high numbers of potato psyllids this season, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms

Photos of typical ZC symptoms exhibited by foliage and tubers may be found in this alert as well as at the link below. Be aware that symptoms in tubers may not be show through the entire tuber or in all tubers under a single plant.
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

» ZC_tubers_and_aerial_tubers.jpg

August 19, 2016 – First incidence of ZC in Idaho during 2016; psyllid numbers still high

Potato    All Locations

potato psyllids

Posted on: August 19, 2016 by Amy Carroll

At least two fields in western Idaho were found to exhibit a high incidence of severe ZC symptoms in tubers. The incidence is estimated to be upwards of 60%. Samples are on their way to campus for confirmation of ZC by molecular testing. Unfortunately, these fields were not part of our psyllid monitoring network; however, this development supports the need to maintain an IPM program targeting psyllids through the end of the season.

Only one potato psyllid collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Payette (1 field).

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (2 fields), Gooding (2 fields), Twin Falls (5 fields), Jerome (3 fields), Minidoka (2 fields), and Cassia (4 fields). Additionally, potato psyllid nymphs (22 total) were captured on leaf samples from Ada County (2 fields) and Canyon County (2 fields), with 38 potato psyllid adults being captured from vacuum samples taken from four Intense fields in the following counties: Canyon, Ada, and Gooding.

We collected 690 psyllids this week from sticky cards (556 from Light sites and 134 from Intense sites). Of the total 728 psyllids captured this week, 643 came from the Treasure Valley. We found psyllids in 43 of the 83 fields (52%) that were sampled this week. We had several cards from sites that did not come in this week, but will be processed when they hopefully arrive next week.

Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

August 12, 2016 – Psyllid numbers fall compared to recent weeks

Potato    All Locations

potato psyllids

Posted on: August 12, 2016 by Amy Carroll

Only three potato psyllids collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Canyon (1 field) and Gooding (1 field). One nymph collected from a leaf sample on an Intense field in Canyon County tested positive.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (1 field), Elmore (2 fields), Gooding (3 fields), Twin Falls (6 fields), Jerome (2 fields), Minidoka (2 fields), and Cassia (1 field). Additionally, potato psyllid nymphs (3 total) were captured on leaf samples from Ada County (1 field) and Jerome County (1 field), with two potato psyllids being captured from a vacuum sample taken from one Intense field in Canyon County.

We collected 260 psyllids this week from sticky cards (190 from Light sites and 70 from Intense sites). Of the total 262 psyllids captured this week, 233 came from the Treasure Valley. We found psyllids in 39 of the 97 fields (40%) that were sampled this week.

Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

August 5, 2016 – Positive psyllids in Payette, Canyon, and Ada counties

Potato    All Locations

potato psyllids

Posted on: August 5, 2016 by Amy Carroll

Several potato psyllids collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Payette (1 field), Canyon (7 fields), and Ada (1 field). This is fewer than the previous two weeks.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (2 fields), Gooding (1 field), Twin Falls (4 fields), Jerome (6 fields), Minidoka (3 fields), Cassia (4 fields), Power (3 fields), and Bingham (1 field). Additionally, potato psyllid nymphs (26 total) were captured on leaf samples from Ada County (2 fields) and Canyon County (2 fields), with three potato psyllids being captured from a vacuum sample taken from one Intense field in Canyon County.

We collected 379 psyllids this week from sticky cards (263 from Light sites and 116 from Intense sites). Of the total 379 psyllids captured this week, 308 came from the Treasure Valley. We found psyllids in 48 of the 101 fields (48%) that were sampled this week.

Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

July 29, 2016 – More Lso-positive psyllids found in Treasure and Magic Valleys

Potato    All Locations

potato psyllids

Posted on: July 29, 2016 by Amy Carroll

Last week we reported on a sharp increase in the prevalence of Lso-positive psyllids relative to the previous weeks this season. Out of an abundance of caution to avoid reporting any false positives, we re-tested a subset of those positive psyllids and we stand by our original results. The sites during Week 9 with putative positive psyllids that we had labelled as “pending” are now labelled as “positive.”

In addition, several potato psyllids collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Payette (1 field), Owyhee (1 field), Canyon (6 fields), Twin Falls (2 fields), Minidoka (2 fields), and Cassia (1 field). Furthermore, two potato psyllid nymphs collected from leaf samples from a field in Ada County tested positive for Lso.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (2 fields), Twin Falls (8 fields), Jerome (2 fields), Cassia (2 fields), and Power (1). Additionally, potato psyllid nymphs were captured on leaf samples from 2 fields in Ada County, and two potato psyllids were captured from vacuum samples taken from Intense fields in Canyon and Ada County.

We collected 361 psyllids this week from sticky cards (246 from Light sites and 115 from Intense sites). Of the total 363 psyllids captured this week, 335 came from the Treasure Valley. We found psyllids in 40 of the 101 fields (40%) that were sampled this week.

Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

Increase in Lso-positive psyllids in Treasure and Magic Valleys

Potato    All Locations

potato psyllids

Posted on: July 22, 2016 by Erik Wenninger

Numerous potato psyllids collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Payette (1 field), Owyhee (1 field), Canyon (4 fields), Twin Falls (3 fields), and Jerome (1 field).

This represents a sharp increase in the prevalence of Lso-positive psyllids relative to the previous weeks this season. We are quite certain that these results are accurate; however, out of an abundance of caution to avoid reporting any false positives, we are in the process of retesting several samples that did not show as strong a positive result as others. Those sites collected during Week 9 that we believe to be positive but are being retested are marked on the spreadsheet (links provided below) as “pending” in the “% Lso+ psyllids” column. We expect to update these data next week when results from the additional tests come in. We collected psyllids that we believe to be positive but that currently have a status of Lso “pending” in the following counties: Payette (2 fields), Owyhee (2 fields), Canyon (2 fields), Ada (1 field), and Jerome (1 field).

Regardless, there clearly has been an increase in the prevalence of Lso-positive psyllids as well as relatively high numbers of psyllids overall. Therefore, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (1 field), Twin Falls (2 fields), Jerome (3 fields), Gooding (1 field), Minidoka (2 fields), and Cassia (6 fields).

We collected 245 psyllids this week from sticky cards (179 from Light sites and 66 from Intense sites). Two potato psyllids were collected in a vacuum sample on an Intense site in Canyon County, and four nymphs were found on leaf samples from an Intense site in Ada County. Of the total 247 psyllids captured this week, 152 came from the Treasure Valley. We found psyllids in 38 of the 103 fields (37%) that were sampled this week.

More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.

http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

July 15, 2016 – First Lso-positive psyllid found in Magic Valley this year

Potato    All Locations

potato psyllids

Posted on: July 15, 2016 by Amy Carroll

One potato psyllid collected last week on a sticky card from a potato field in Jerome County tested positive for Lso (liberibacter), the bacterium that causes zebra chip. All other psyllids collected last week tested negative for Lso.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (3 fields), Canyon (11 fields), Ada (2 fields), Elmore (1 field), Twin Falls (4 fields), Jerome (1 field), and Gooding (1 field). This is the first potato psyllid captured in Gooding County this year.

We collected 100 psyllids this week from sticky cards (69 from Light sites and 30 from Intense sites). One potato psyllid was collected in a vacuum sample on an Intense site in Twin Falls County. Of the total 100 psyllids captured this week, 92 came from the Treasure Valley.

We had traps deployed in 105 of the 107 fields (98%) that will be monitored this year. We found psyllids in 27 of the 105 fields (26%) that were looked at this week.

As always, we urge growers and crop consultants to have an IPM program in place. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the links below.

http://www.uidaho.edu/extension/news/psyllid-management

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

July 8, 2016 – Increasing psyllid numbers in Treasure Valley

Potato    All Locations

potato psyllids

Posted on: July 8, 2016 by Amy Carroll

All of the psyllids collected last week tested negative for Lso, the bacterium that causes zebra chip.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Canyon (12 fields), Ada (2 fields), Elmore (1 field), Twin Falls (1 field), Jerome (1 field), and Power (1 field). We collected 99 psyllids this week from sticky cards (67 from Light sites and 32 from Intense sites).

Of the total 99 psyllids captured this week, 96 came from the Treasure Valley. Two of these psyllids were from vacuum samples taken from an Intense site in Canyon County.

We had traps deployed in 100 of the estimated 107 fields (93%) that will be monitored this year, although we are still waiting for cards from 10 sites to be delivered and processed. We found psyllids in 22 of the 90 fields (24%) that were looked at this week.

As always, we urge growers and crop consultants to have an IPM program in place. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the links below.

http://www.uidaho.edu/extension/news/psyllid-management

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

2016 Miller Research Potato Pest Management Field Day

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Posted on: July 5, 2016 by Jeff Miller

The 2016 Miller Research Potato Pest Management Field Day will be held Wednesday, August 17 from 9:00-10:30 am. Please see the attached page for details.

» 2016 Miller Research Potato Pest Management Field Day

New article on late blight and potato psyllid management

Potato    All Locations

Late blight

Posted on: July 5, 2016 by Jeff Miller

Early season weather and the presence of late blight in 2015 has made the risk of late blight high for 2016. The attached article discusses some considerations for late blight management and also discusses some cautions when simultaneously treating for potato psyllids.

» Preparing for Late Blight in 2016

First psyllids found in Power and Bingham counties

Potato    All Locations

potato psyllids

Posted on: July 1, 2016 by Erik Wenninger

All of the psyllids collected last week tested negative for Lso, the bacterium that causes zebra chip.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (2 fields), Canyon (12 fields), Ada (1 field), Elmore (1 field), Twin Falls (2 fields), Bingham (1 field), and Power (1 field). These are the first psyllid captures this year in Power and Bingham counties. We collected 48 psyllids this week from sticky cards (34 from Light sites and 14 from Intense sites).

We had traps deployed in 97 of the estimated 107 fields (91%) that will be monitored this year and found psyllids in 24 of the 97 fields (25%).

As always, we urge growers and crop consultants to have an IPM program in place. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the links below.

http://www.uidaho.edu/extension/news/psyllid-management

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

June 24, 2016 – First potato psyllid found in Minidoka County

Potato    All Locations

potato psyllid

Posted on: June 24, 2016 by Amy Carroll

All of the psyllids collected last week tested negative for Lso, the bacterium that causes zebra chip.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (2 fields), Owyhee (1 field), Canyon (10 fields), Ada (1 field), Jerome (1 field), Twin Falls (1 field), and Minidoka (1 field). This is the first psyllid captures this year in Minidoka County. We collected 35 psyllids this week from sticky cards (23 from Light sites and 12 from Intense sites).

We had traps deployed in 94 of the estimated 107 fields (88%) that will be monitored this year and found psyllids in 18 of the 94 fields (19%).

As always, we urge growers and crop consultants to have an IPM program in place. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the links below.

http://www.uidaho.edu/extension/news/psyllid-management

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

More psyllids found in Treasure and Magic Valleys

Potato    All Locations

potato psyllids

Posted on: June 17, 2016 by Erik Wenninger

All of the psyllids collected last week tested negative for Lso, the bacterium that causes zebra chip.

Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Canyon (10 fields), Ada (1 field), Gooding (1 field), and Jerome (1 field). These are the first psyllid captures this year in Gooding and Jerome counties. We collected 42 psyllids this week from sticky cards (33 from Light sites and 9 from Intense sites).

We had traps deployed in 88 of the estimated 107 fields (82%) that will be monitored this year and found psyllids in 17 of the 80 fields for which we have had cards returned thus far (21%; we are still waiting to receive cards from 8 fields).

As always, we urge growers and crop consultants to have an IPM program in place. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the links below.

http://www.uidaho.edu/extension/news/psyllid-management

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

More psyllids found in Treasure Valley; none in Magic Valley - June 10, 2016

Potato    All Locations

potato psyllid

Posted on: June 11, 2016 by Amy Carroll

All of the psyllids collected last week tested negative for Lso, the bacterium that causes zebra chip.

Psyllids were collected this week on sticky traps in potato in the following counties: Payette (3 fields), Owyhee (1 field), Canyon (13 fields), Ada (2 fields), and Elmore (1 field).

We had traps deployed in 82 of the estimated 107 fields (76.6%) that will be monitored this year and found psyllids in 20 of these 82 fields (24.3%).

As always, we urge growers and crop consultants to have an IPM program in place. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the links below.

http://www.uidaho.edu/extension/news/psyllid-management

Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

First potato psyllid found in Magic Valley potato field this season

Potato    All Locations

potato psyllids

Posted on: June 3, 2016 by Erik Wenninger

We collected our first potato psyllid from the Magic Valley this year, on a sticky card deployed in potato. In addition, we collected psyllids from several fields in the Treasure Valley. Psyllids were collected this week on sticky traps in potato in the following counties: Malheur (Oregon), Canyon (4 fields), Ada (2 fields), and Twin Falls.

We know from previous years that psyllids tend to occur earlier and in greater numbers in the Treasure Valley, and patterns observed thus far this year are consistent with this.

We had traps deployed in 68 of the estimated 107 fields (63.6%) that will be monitored this year and found psyllids in 4 of these 68 fields (11.8%).

On another note, of five potato psyllids collected in vacuum samples from bittersweet nightshade on May 17 from Shoshone Falls Park, three were positive for liberibacter (Lso), the bacterium that causes zebra chip.

As always, we urge growers and crop consultants to have an IPM program in place. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the links below.

http://www.uidaho.edu/extension/news/psyllid-management

Detailed results from the “Light” sites (from which the two psyllids were found) can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

Volunteer Potato Management

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Volunteer potatoes

Posted on: June 3, 2016 by Pam Hutchinson

Here’s an update to the recent article by Pamela Hutchinson, Potato Cropping Systems Weed Scientist at the University of Idaho Aberdeen R&E Center in SE Idaho, on methods for controlling volunteer potatoes. As previously mentioned, due to the mild winter experienced in the Pacific Northwest, tubers left after the 2015 harvest can and did survive. At this point in time (first week of June), volunteer plants may be past the tuber initiation, which has been shown to be the best stage for application of many herbicides for effective control, and to prevent re-sprouting and tuber production. However, that is not the case for all fields.

In addition, there are reports of newly emerging sprouts/plants after fields appear to have been sprayed. Fields should be monitored closely after an application in order to determine if further actions are needed!

Thanks,

Pam

» Volunteer Control Bulletin

» P. Hutchinson volunteer control recommendations

First Lso-positive potato psyllids found in Idaho potato fields this season

Potato    All Locations

potato psyllids

Posted on: June 2, 2016 by Erik Wenninger

Both of the potato psyllids found last week (one in each of two potato fields in Canyon County) tested positive for liberibacter (Lso; the bacterium that causes zebra chip).

A more detailed update of trapping results from the past week will be posted on Friday.

We continue to urge growers and crop consultants to implement IPM programs for zebra chip. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Potato Psyllids in Malheur County

Potato    All Locations

Potato Psyllid

Posted on: May 29, 2016 by Stuart Reitz

We collected our first potato psyllids of the season from sticky cards in Malheur County potato fields. Two psyllids were found – one in each of two potato fields.

For information and resources on potato psyllids and zebra chip, including management and scouting recommendations, please see the following article: http://www.nwpotatoresearch.com/IPMStuff/PDFs/PotatoPsyllid.pdf.

Additional information on pest management in potatoes in the PNW is available at:
http://www.nwpotatoresearch.com/IPMStuff/PDFs/NorthwestInsectGuidelines.pdf

» http://www.nwpotatoresearch.com/IPMStuff/PDFs/PotatoPsyllid.pdf

» http://www.nwpotatoresearch.com/IPMStuff/PDFs/NorthwestInsectGuidelines.pdf

First potato psyllids found in Idaho potato fields this season

Potato    All Locations

potato psyllids

Posted on: May 27, 2016 by Erik Wenninger

May 27, 2016 – First potato psyllids found in Idaho potato fields this year

We collected our first potato psyllids of the season from sticky cards in Idaho potato fields. Two psyllids were found – one in each of two potato fields in Canyon County. We found our first potato psyllids at a similar time last year.

Sticky cards have now been deployed in 66 of the estimated 97 fields that will be included in the monitoring program this year.

We urge growers and crop consultants to have an IPM program in place. More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://www.uidaho.edu/extension/news/psyllid-management

Detailed results from the "Light" sites (from which the two psyllids were found) can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

Detailed results from the "Intense" sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

» http://www.uidaho.edu/extension/news/psyllid-management

» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0

» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0

2016 Potato psyllid monitoring program underway in Idaho

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potato psyllids

Posted on: May 13, 2016 by Erik Wenninger

The University of Idaho, in collaboration with Miller Research and several crop consultants across the state will continue our monitoring program for potato psyllids, zebra chip, and liberibacter (Lso), the bacterium that causes zebra chip. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by IPC, USDA, and generous in-kind contributions by our collaborators.

The first deployment of sticky cards on several of our sites occurred during the past week. More details on the program will be forthcoming, but it will be similar to what we’ve done over the last three years.

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://www.uidaho.edu/extension/news/psyllid-management

Clarification on seed treatment for late blight

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Late Blight

Posted on: April 1, 2016 by Jeff Miller

A point of clarification on the announcement for using seed piece treatments to manage late blight: State registrations have not yet been granted in ID, OR or WA for the use of Revus at this time. However, it is expected soon. Do not use Revus until the state registrations are in place. If you are going to use a seed treatment for late blight and the state registration is not in place, please choose another fungicide.

Seed treatment for late blight management in potato

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Late Blight

Posted on: March 31, 2016 by Jeff Miller

The widespread presence of late blight in 2015 has created the possibility of late blight coming into commercial potato production through infected seed. If growers suspect their seed may have late blight, they should treat with a seed treatment effective against late blight. Mancozeb dust (6%) is an effective treatment. Some liquid seed treatments are also available and research has shown them to be more effective than just using 6% MZ dust alone. Curzate (cymoxanil), Reason (fenamidone), and now Revus (mandipropamid) are labeled for treatment of seed for the control of late blight.

2015 Miller Research Potato Pest Management Workshop

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Posted on: November 18, 2015 by Jeff Miller

Miller Research LLC will be holding its annual potato pest management seminar on December 8, 14, and 15. The same program will be held on all three days. Please RSVP as seating in each session is limited to 45. The meetings will be held at the Miller Research facility located near Rupert, ID (426 E 200 N). Lunch will be provided. There is no cost to attend the meeting. CCA and ISDA credits have been requested.

More information can be found at the accompanying link and in the attached flier.

» http://www.millerresearch.com/alerts/research-news/item/53-mr-potato-pest-management-workshop

» 2015_MR_Workshop_Flier.pdf

ZC-positive plants found in potato fields in Minidoka and Twin Falls counties

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Potato Psyllid

Posted on: October 2, 2015 by Amy Carroll

Tubers sampled from a potato field in Minidoka County and a field in Twin Falls County tested positive for liberibacter (Lso), the bacterium that causes zebra chip (ZC). So far this season we are aware of four fields in Idaho with confirmed ZC. Earlier this season we reported finding Lso-positive tubers from Ada and Power counties.

As the season winds down, we encourage growers and crop consultants to be on the lookout for symptomatic tubers.

Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

Monitoring of psyllids in Idaho concludes for 2015 growing season

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Potato Psyllid

Posted on: September 25, 2015 by Amy Carroll

Nearly all of our fields have been vine killed and are no longer being monitored. However, we are maintaining sticky cards around the outside of some of our “Intense” sites in order to characterize any off-season psyllid activity. Only two psyllids were found this week from these traps (both from a field in Gooding County).

Trapping ended on all of our “Light” fields as of last week; however, some cards that arrived late last week were read this week. The relevant link below shows this update.

No new psyllids have tested positive for Lso (liberibacter, the bacterium that causes zebra chip). Some psyllids from last week remain to be tested.

Potato psyllid captures from our bittersweet nightshade sites remain relatively low as well, with 10 psyllids collected from among the four Treasure Valley sites and 11 psyllids collected from among the four Magic Valley sites.

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Update of potato psyllid monitoring in Idaho

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potato psyllids

Posted on: September 19, 2015 by Erik Wenninger

Abundance of potato psyllids in potato fields in Idaho appears to be lower than last week, with 85 total psyllids captured on sticky cards and vacuum samples thus far (versus 139 captured last week). Several of our “Intense” cards from the Treasure Valley will be processed Monday next week and updated results will be posted at the links below. Captures came from the following counties: Canyon, Ada, Owyhee, Gooding, Twin Falls, Jerome, Minidoka, and Cassia.

Many of our sites, including nearly all of the “Light” sites have been vine killed or harvested and will no longer be sampled.

None of the psyllids that were captured last week was positive for liberibacter (Lso), the bacterium that causes zebra chip, though a few psyllids remain to be tested.

Potato psyllid captures from our bittersweet nightshade sites in the Treasure Valley that arrived late last week were markedly lower than the previous fortnightly sample, with only 4 psyllids found (this is in contrast with the 54 psyllids that we reported on capturing in the Magic Valley sites).

As always, we encourage growers and crop consultants to scout for symptomatic plants and to consider the risk level this year when making insecticide decisions through the remainder of the season.

Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

ZC-positive plants found in potato field in Power County, Idaho

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zebra chip

Posted on: September 16, 2015 by Erik Wenninger

Tubers sampled from a field in Power County tested positive for liberibacter (Lso), the bacterium that causes zebra chip.

We have found some potato psyllids in our monitoring fields a few miles away from this site, although no psyllids collected from this area have tested positive for Lso so far this year.

As always, we encourage growers and crop consultants to scout for symptomatic plants and to consider the risk level this year when making insecticide decisions through the remainder of the season.

Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

Potato psyllid abundance similar to last week.

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Potato Psyllid

Posted on: September 11, 2015 by Amy Carroll

Abundance of potato psyllids captured on sticky cards in potato fields in Idaho was similar to last week, with 139 total psyllids captured. Captures came from the following counties: Canyon, Ada, Owyhee, Gooding, Twin Falls, Jerome, and Minidoka counties . In addition, we found 8 nymphs and 4 eggs across three fields in Gooding, Jerome, and Twin Falls counties.

Several more fields have undergone vine kill and are no longer being sampled.

None of the psyllids that were captured last week was positive for liberibacter (Lso), the bacterium that causes zebra chip. A few psyllids remain to be tested. None of the psyllids that remained to be tested at this time last week was positive for Lso.

Some sticky cards have yet to come in this week. As these samples are processed, we will post updated results at the links below.

Psyllid abundance from our fortnightly bittersweet nightshade sampling appears to be up this week. We found a total of 54 potato psyllids (48 from vacuum samples and 6 from sticky cards) across three of our four Magic Valley sites (the Twin Falls Park site is temporarily inaccessible due to construction). Samples from our Treasure Valley sites just arrived and are still in process.

We continue to encourage growers and crop consultants to scout for symptomatic plants and to consider the typical late-season surge in psyllid abundance when making insecticide decisions through the remainder of the season.

Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

Potato psyllid abundance increased; a few more Lso-positive psyllids

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potato psyllids

Posted on: September 4, 2015 by Erik Wenninger

Abundance of potato psyllids captured on sticky cards in potato fields in Idaho was about 50% higher this week than last with 149 total psyllids. Captures came from Canyon, Ada, Owyhee, Elmore, Gooding, Twin Falls, Jerome, Blaine, and Cassia counties. Several fields have undergone vine kill and are no longer being sampled.

Four of the psyllids that were captured last week were positive for liberibacter (Lso), the bacterium that causes zebra chip. These were from Canyon (one psyllid from each of three different fields) and Owyhee counties.

With the summer winding down and much of our crew having dispersed back to school, we are running a bit behind on leaf and vacuum samples (last week’s results are posted below; only one psyllid was found in a vacuum sample). We expect to complete these next week at which time we will post at the links below.

From our bittersweet nightshade sampling last week, we found a total of 22 psyllids among Treasure Valley and Magic Valley sites; this is about 50% lower than our previous fortnightly sample.

We continue to encourage growers and crop consultants to scout for symptomatic plants and to consider the late-season increase in psyllid abundance when making insecticide decisions through the remainder of the season.

Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

Potato psyllid abundance similar to last week

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potato psyllids

Posted on: August 29, 2015 by Erik Wenninger

Total abundance of potato psyllids captured in potato fields in Idaho was similar to last week, with the highest overall numerical count we’ve recorded this year from sticky traps: 102 total potato psyllids. Captures came from Canyon, Ada, Owyhee, Elmore, Gooding, Twin Falls, Jerome, Cassia, and Power counties.

Two of the psyllids that were captured last week were positive for liberibacter (Lso), the bacterium that causes zebra chip. These were from Gooding and Minidoka counties.

With the summer winding down and much of our crew having dispersed back to school, we are running a bit behind on leaf and vacuum samples and on samples from bittersweet nightshade. We hope to have these completed early next week. Leaf and vacuum sample results will be posted at the links below when completed.

We regret to report that there was a problem with some of the liberibacter samples that we sent to campus to be tested a few weeks ago. These were rerun, and it turns out that incidence was lower than previously reported. Corrected liberibacter incidence can be found on the spreadsheets linked below. In spite of this, risk of ZC appears to be higher this year than during the previous two, given the higher abundance of potato psyllids and the presence of liberibacter in psyllids earlier in the season. Therefore, we continue to encourage growers and crop consultants to scout for symptomatic plants and to consider this risk level when making insecticide decisions through the remainder of the season.

Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

Liberibacter-positive tuber found in Idaho potato field

Potato    All Locations

zebra chip

Posted on: August 25, 2015 by Erik Wenninger

One of the tubers that was sampled recently from a field in Ada County tested positive for liberibacter (Lso), the bacterium that causes zebra chip (ZC). The sample was taken from one of our “Intense” sites that has seen a relatively large number of liberibacter-positive psyllids. Both foliar and tuber symptoms have been difficult to find in this and other fields that we’ve inspected, so at least in these fields, overall ZC incidence appears to be low.

Nevertheless, risk of ZC appears to be higher this year than during the last two, especially in the Treasure Valley, so we continue to encourage growers and crop consultants to scout for symptomatic plants and to consider this risk level when making insecticide decisions through the remainder of the season.

Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

Potato psyllid abundance increased again this week; a few more Lso-positive psyllids

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potato psyllids

Posted on: August 21, 2015 by Erik Wenninger

Total abundance of potato psyllids captured in potato fields in Idaho increased about 50% relative to last week; most of this increased abundance occurred in the Treasure Valley. We captured 97 psyllids on sticky cards in fields across the Treasure and Magic Valleys, including fields in Canyon, Ada, Owyhee, Elmore, Gooding, Twin Falls, Jerome, and Minidoka counties. We also found a psyllid on a card submitted to our lab from Power County. In addition, we found a total of seven potato psyllid nymphs from leaf samples collected two different fields in Gooding and Jerome counties.

Two of the psyllids collected last week from potato fields tested positive for liberibacter (Lso), the bacterium that causes zebra chip. Also, two psyllids that we collected in vacuum samples from bittersweet nightshade in Shoshone Falls Park in Twin Falls tested positive for liberibacter.

Risk of zebra chip appears to be higher this year than the last two, especially in the Treasure Valley, so we continue to encourage growers and crop consultants to scout for symptomatic plants and to consider this risk level when making insecticide decisions through the remainder of the season.

Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

Handouts from the Late Blight Management Meetings

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Late blight

Posted on: August 20, 2015 by Jeff Miller

Meetings were held in American Falls and Idaho Falls on August 18 focused on providing information on late blight management in potato. PowerPoint handouts from those meetings are attached here. The first reviews management in the field up until harvest. The second discusses storage management. The third discusses vine kill as it relates to late blight management.

» Managing Late Blight Late Season

» Managing Late Blight in Storage

» Vine Kill Considerations for Late Blight Management

Clarification on late blight meeting

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Late blight

Posted on: August 14, 2015 by Jeff Miller

The previous alert did not specify the locations for the late blight management meetings:

American Falls at the American Falls High School Auditorium - Tuesday, August 18 from 10:00 am -12:00 pm

Idaho Falls at the University of Idaho (Tingey Administration Building auditorium) – Tuesday, August 18 from 1:30 pm – 3:30 pm

Managing Late Blight Going into Storage

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Late blight

Posted on: August 14, 2015 by Jeff Miller

Please note that the American Falls meeting outlined below replaces the meeting planned for Aberdeen!

The University of Idaho and Miller Research are sponsoring a meeting on managing late blight going into storage. The meeting agendas are as follows:

American Falls - Tuesday, August 18 from 10:00 am -12:00 pm.

Idaho Falls – Tuesday, August 18 from 1:30 pm – 3:30 pm

Dr. Jeff Miller will speak first and discuss proper disease identification, pathogen life cycle and biology, disease management considerations in the field, and appropriate use of fungicides late season through vine kill.

Dr. Nora OIsen will discuss post –harvest fungicide use and selection and proper storage management considerations.

Two ISDA recertification credits are available.

potato psyllid update

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potato psyllids

Posted on: August 14, 2015 by Erik Wenninger

Abundance of potato psyllids captured in potato fields in Idaho is up slightly from last week. We captured 63 psyllids on sticky cards in fields across the Treasure and Magic Valleys, including fields in Payette, Canyon, Ada, Owyhee, Elmore, Gooding, Twin Falls, Jerome, and Cassia counties. In addition, we found one potato psyllid nymph on a leaf sample from a field in Gooding County.

All of the psyllids collected last week (cards deployed during the week of July 26 and collected during the week of August 2) tested negative for liberibacter (Lso), the bacterium that causes zebra chip.

We captured 43 psyllids from our fortnightly bittersweet nightshade sampling around the Treasure and Magic Valleys. This also is up slightly from the previous samples.

We collected tubers this week and last from several fields that have had the highest incidence of liberibacter-positive psyllids. Foliar symptoms were mostly lacking and, although most tubers examined were clean, a few were found with apparent zebra chip (ZC) symptoms. These samples are being tested for liberibacter, which is the only way to determine with certainty whether or not the plants actually have ZC.

Although all psyllids collected last week were negative for liberibacter and tuber samples that we have examined have been mostly clean, the level of liberibacter found in psyllid samples from Canyon and Ada counties during recent weeks suggests that risk of ZC may be higher in this area. Therefore, we encourage growers and crop consultants to scout for symptomatic plants and to consider this risk level when making insecticide decisions through the remainder of the season.

Photos of typical ZC symptoms exhibited by foliage and tubers may be found here:
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management

» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf

» http://www.uidaho.edu/extension/news/psyllid-management

Late blight management meeting

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Late blight

Posted on: August 14, 2015 by Jeff Miller

A meeting on managing late blight going into storage will be held at the Aberdeen High School on Tuesday, August 18 at 10:00 AM. Speakers will be Dr. Nora Olsen (University of Idaho) and Dr. Jeff Miller (Miller Research). Call Jeff at 208-431-4420 for more information.

Late blight in Cassia, Madison, Fremont, and Jefferson Count

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Late blight

Posted on: August 13, 2015 by Jeff Miller

Late blight had been confirmed in additional counties. Positive samples were confirmed in Madison, Fremont, and Jefferson counties yesterday and this morning. Two samples have also been confirmed in Cassia County - one on the east side an another on the west.

Potato psyllid abundance similar to recent weeks; more Lso-p

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potato psyllids

Posted on: August 7, 2015 by Erik Wenninger

Abundance of potato psyllids in potato fields in Idaho this week was similar to the past two weeks, if not slightly lower. We captured 37 psyllids on sticky cards in fields across the Treasure and Magic Valleys, including fields in Payette, Canyon, Ada, Owyhee, Elmore, Gooding, Twin Falls, Jerome, and Cassia. In addition, we found a potato psyllid on a card from a field in Power County that was collected last week and submitted to our lab this week.

From week 10 of sampling (cards deployed the week of July 12th and collected the week of the 19th), we collected 14 psyllids that tested positive for liberibacter (Lso), the bacterium that causes zebra chip. All were from fields in Canyon or Ada counties.

From week 11 we had several psyllids, mostly in the Treasure Valley, that tested positive for liberibacter (Lso), the bacterium that causes zebra chip. Positive psyllids were found in Payette County, Canyon County (four different fields), Ada County (15 positive psyllids in one field), Owyhee County, and Twin Falls County. In addition, we found positive psyllids at our bittersweet nightshade site in Murtaugh and at Dierkes Lake in Twin Falls (one from each site).

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

More positive psyllids in Ada County; first Payette and Powe

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Potato Psyllid

Posted on: July 31, 2015 by Erik Wenninger

Abundance of potato psyllids in potato fields in Idaho this week slightly increased, with 57 psyllids captured (compared to 43 last week) across the Treasure Valley, Magic Valley, and Upper Snake. Psyllids were captured this week from several fields in Ada and Canyon counties, as well as from sites in Owyhee, Payette, Twin Falls, Jerome, Cassia and Power counties. This represents the first psyllid captured in Payette as well as in Power County.

Last week we were waiting for results from psyllids captured on cards deployed in potato fields July 6th to 13th. Five psyllids from two different fields in Ada County tested positive for liberibacter (Lso), the bacterium that causes zebra chip. We continue to run a little behind receiving results, but they will be posted on the website below as soon as they come in. Please continue checking throughout the week. We are still waiting on results from psyllids captured last week.

We captured 27 psyllids at our bittersweet nightshade sites around the Treasure and Magic Valleys.

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Late blight

Potato    All Locations

Posted on: July 28, 2015 by Jeff Miller

The late blight in Minidoka County has been determined to be the US-23 strain. This strain is sensitive to mefenoxam. As a result, growers can use Ridomil Gold pre-packs (e.g. Ridomil Gold Bravo, Ridomil Gold MZ) to manage late blight. Fields which have been treated with mefenoxam appear to be free of late blight even though they are close to fields with confirmed late blight.

Additional fields in Minidoka County have been confirmed, with the latest finds close to Rupert.

More information on fungicides for managing late blight can be found at the link below.

» http://www.millerresearch.com/agricultural-research/agricultural-research-reports/potato-research-reports/late-blight/item/44-late-blight-fungicide-management

Zero positive potato psyllids from last week

Potato    All Locations

Potato Psyllid

Posted on: July 24, 2015 by Amy Carroll

Overall abundance of potato psyllids in potato fields in Idaho this week continued to decline, with 43 psyllids captured (compared to 71 last week) across the Treasure and Magic Valleys. Psyllids were captured this week from several fields in Ada and Canyon counties, as well as from a few different sites in Elmore and Twin Falls counties. We are still waiting on a shipment of sticky cards from our “Light” sites (approximately 20 fields) in Cassia and Minidoka counties.

Zero psyllids from last week tested positive for liberibacter (Lso), the bacterium that causes zebra chip—one each from Canyon, Ada, and Minidoka counties.

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

More late blight in Minidoka County

Potato    All Locations

Late blight

Posted on: July 22, 2015 by Jeff Miller

Late blight had been confirmed in two additional fields in Minidoka County. It is likely in several others. Pathogen spread is likely with current weather conditions. Growers are encouraged to report additional finds so that the extent of infection and rate of spread can be documented.

Potato Pest Management Field Day

Potato    All Locations

Posted on: July 21, 2015 by Jeff Miller

Miller Research will be holding a pest management field day on Thursday, August 13 at the Miller Research facility located near Acequia, ID (426 E 200 N). A short presentation will be given in the office followed by a tour of the research plots.

The presentations will focus on and chemical management of diseases and will highlight research which has been funded by the Pacific Northwest Potato Research Consortium. We have requested 3 ISDA pesticide recertification credits and 3 CCA (Pest Management) credits for this meeting.

Lunch will be provided. Please RSVP to Jeff Miller by August 10 at 208-531-5124 or by email at: jeff@millerresearch.com so that we can get an accurate count for room preparation purposes.

See the attachment for additional details.

» 2015 Miller Research Potato Pest Management Field Day

Weekly Potato Disease Update

Potato    Eastern Idaho

Late blight

Posted on: July 17, 2015 by Phillip Wharton

Potato diseases are starting to pick up across the state with the recent wet weather. Dr. Mike Thornton reports that in the Treasure Valley area, there were locally heavy rains associated with thunderstorms much of the past week with some hail damage in a few isolated areas. Cooler temperatures, when combined with the rain are favorable for diseases such as late blight, white mold and aerial stem rot (with hail damage). As such field men should be vigilant and fields should be scouted on a regular basis and growers are urged to apply protectant fungicides.

In the Magic valley early blight and white mold is on the increase due to recent rain showers. Again, due to the weather growers should be vigilant for signs of late blight.

In south eastern Idaho there are currently three confirmed fields in Bingham Co. with late blight. Genotyping of isolates have identified the strain as US 23. It is imperative that field men and growers bring in any suspected late blight samples to the university offices at Idaho Falls or Aberdeen for confirmation and so that we can monitor the late blight strains causing the epidemic. A knowledge of the strains involved in the outbreak will allow us to make better fungicide recommendations to growers. All sample origin information will be kept confidential with only the county of origin being reported.

Since the strains from the current outbreak in Bingham county are US 23, we are dealing with a mefenoxam sensitive strain of late blight. The most effect product for the control of mefenoxam sensitive late blight strains is Ridomil Gold Bravo. Ridomil has been shown to have curative properties and may halt a late blight epidemic if it is applied early enough in the outbreak (less than 1% field infection). Do not use Ridomil if you don't know what strain you have in your crop, as most other strains of late blight are resistant to Ridomil.

In fields where only a few random late blight lesions have been found evenly distributed throughout field (0 - 1% foliar infection), an application of Ridomil Gold Bravo should be made followed by a systemic fungicide such as Revus, Forum, Curzate 60DF, Ranman, Tanos, Gavel or Previcur Flex 5 - 7 days after the first application. The field should then be monitored closely until the end of the season and protectant fungicide applications (EBDC or Chlorothalonil products) made every 7 days until harvest. A late season application of Gavel has been shown to provide additional protection from tuber blight.

In infected fields with one or more (up to 5) loci spreading from the edge of the field or from several centers within the field (1% overall field infection but locally heavily infected plants 5 - 10%), infected areas should be destroyed with Reglone or a similar vine killing herbicide. Destruction of infected areas within the crop with late blight should follow the rules that 30 rows either side of the newest lesions at the border of the late blight locus and 100 feet along the row (either side) are killed with Reglone or with Gramoxone. Although harsh, research has shown that the latent period between infection and symptom development is about seven days and although not visible plants within this area are already infected. An application of Ridomil Gold Bravo should then be applied as above and followed by an alternative fungicide 5 days later. Protectant fungicide applications should then be made every 7 days until harvest.

For more detailed information on late blight fungicide recommendations see the attached link (http://bit.ly/1LfZtmW)

For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases

» http://bit.ly/1LfZtmW

» http://www.twitter.com/potatodiseases

Potato psyllid numbers dip; more positive psyllids from last

Potato    All Locations

potato psyllids

Posted on: July 17, 2015 by Erik Wenninger

Overall abundance of potato psyllids in potato fields in Idaho this week generally were considerably lower than the previous week, which may have been due to the cooler temperatures. Psyllids were captured this week in Canyon, Owyhee, and Elmore counties, as well as from several different sites in both Jerome and Twin Falls counties. We are still waiting on a shipment of sticky cards from our “Intense” sites in Canyon and Ada counties.

Three psyllids from last week tested positive for liberibacter (Lso), the bacterium that causes zebra chip—one each from Canyon, Ada, and Minidoka counties.

Psyllid captures also were lower at our bittersweet nightshade sites around the Treasure and Magic valleys.

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Late blight in Bingham County

Potato    All Locations

Late Blight

Posted on: July 10, 2015 by Jeff Miller

Late blight has been positively diagnosed in south central Bingham County. The weather has been very favorable for disease development the past few days and it is likely that the pathogen will spread. Protectant fungicides should be applied now if they are not already in place. A discussion of fungicides for the management of late blight and other information on late blight can be found at the link below.

It is critical to scout fields in all areas of the state, particularly in areas where leaves remain wet longer (i.e. at the pivot point, along mainlines, irrigation overlaps) or in areas where fungicide deposition may be compromised. Please bring in suspect samples to University of Idaho or Miller Research. It is critical for us to understand the distribution and strain of the pathogen.

» http://www.millerresearch.com/alerts/pest-alerts/item/49-late-blight-management-2015

Potato psyllid numbers rising, another positive psyllid, and

Potato    All Locations

Potato Psyllid

Posted on: July 10, 2015 by Amy Carroll

Overall abundance of psyllids in potato fields in Idaho has increased in both the Treasure Valley and Magic Valley. Last week we reported 28 adult potato psyllids captured in potato fields. This week the numbers have jumped considerably to 111 total adults captured. Psyllids were collected this week from the following counties: Canyon, Ada, Owyhee, Elmore, Jerome, Twin Falls, Minidoka, Cassia, and Bingham. This represents the first psyllid capture this year from Elmore and Bingham Counties. In addition, we collected eight psyllids at the Kimberly Research & Extension Center.

One of the psyllids we collected last week from a field in Twin Falls County tested positive for Lso, the bacterium that causes zebra chip. We are still waiting on some results from pyllids captured last week. We also collected our first potato psyllid eggs (two total) this year from an “intense” (10 sticky cards) monitoring field in Twin Falls County. This particular field yielded 17 total adult psyllids from sticky cards.

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

First potato psyllid nymphs found in a potato field in Idaho

Potato    All Locations

potato psyllids

Posted on: July 2, 2015 by Erik Wenninger

Overall abundance of potato psyllids in potato fields was similar this week (28 adults total) compared to last (26 adults total), though numbers were higher this week relative to last in the Treasure Valley. Psyllids were collected this week from the following counties: Canyon, Ada, Owyhee, Gooding, Jerome, Twin Falls, Minidoka, Cassia, and Blaine. We collected one psyllid at the Kimberly Research & Extension Center.

We also collected our first potato psyllid nymphs (three total) this year from a field in Cassia County.

In addition, we collected many potato psyllids from bittersweet nightshade sites in the Magic Valley, including 37 from vacuum samples at Shoshone Falls Park.

None of the potato psyllids that we collected last week tested positive for Lso, the bacterium that causes zebra chip (though three psyllids that arrived at our lab late last week have yet to be tested).

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

First potato psyllid nymphs found in a potato field in Idaho

Potato    All Locations

potato psyllids

Posted on: July 2, 2015 by Erik Wenninger

Overall abundance of potato psyllids in potato fields was similar this week (28 adults total) compared to last (26 adults total), though numbers were higher this week relative to last in the Treasure Valley. Psyllids were collected this week from the following counties: Canyon, Ada, Owyhee, Gooding, Jerome, Twin Falls, Minidoka, Cassia, and Blaine. We collected one psyllid at the Kimberly Research & Extension Center.

We also collected our first potato psyllid nymphs (three total) this year from a field in Cassia County.

In addition, we collected many potato psyllids from bittersweet nightshade sites in the Magic Valley, including 37 from vacuum samples at Shoshone Falls Park.

None of the potato psyllids that we collected last week tested positive for Lso, the bacterium that causes zebra chip (though three psyllids that arrived at our lab late last week have yet to be tested).

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Potato psyllid numbers increasing in Magic Valley potato fie

Potato    All Locations

Potato Psyllid

Posted on: June 26, 2015 by Amy Carroll

June 26, 2015 – Potato psyllid numbers increasing in Magic Valley potato fields

Abundance of potato psyllids appears to be increasing in the Magic Valley. We collected eight psyllids from one site in Jerome County. This week, we also collected potato psyllids from three different Canyon County fields (one psyllid per site), six different fields in Twin Falls County (one psyllid per site), one psyllid from another site in Jerome County, and seven psyllids from five sites (two on one field) in Cassia County. This represents our first psyllid captures this season in Cassia County. In addition, we collected our first psyllid since April at the Kimberly Research & Extension Center.

Aside from the one positive psyllid we reported on last week, none of the other potato psyllids that we collected last week tested positive for Lso, the bacterium that causes zebra chip.

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Potato psyllid numbers increasing in Magic Valley potato fie

Potato    All Locations

Potato Psyllid

Posted on: June 26, 2015 by Amy Carroll

June 26, 2015 – Potato psyllid numbers increasing in Magic Valley potato fields

Abundance of potato psyllids appears to be increasing in the Magic Valley. We collected eight psyllids from one site in Jerome County. This week, we also collected potato psyllids from three different Canyon County fields (one psyllid per site), six different fields in Twin Falls County (one psyllid per site), one psyllid from another site in Jerome County, and seven psyllids from five sites (two on one field) in Cassia County. This represents our first psyllid captures this season in Cassia County. In addition, we collected our first psyllid since April at the Kimberly Research & Extension Center.

Aside from the one positive psyllid we reported on last week, none of the other potato psyllids that we collected last week tested positive for Lso, the bacterium that causes zebra chip.

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Potato Pest Alert for the week ending 6-26-2015

Potato    All Locations

Posted on: June 26, 2015 by Phill Wharton

Dr. Mike Thornton reports that there are not a lot of disease issues coming through the door right now. In the Treasure Valley area, we are seeing a little bit of early blight on lower leaves, especially on plants that are stressed due to virus infection or other issues. Speaking of stress, the hot days and warm nights forecast for the next week or so can be very hard on potato plants. To reduce the incidence of physiological disorders like sugar ends, it is important to adjust irrigation schedules to account for the increase in water demand by the crop. Growers cannot afford to get behind on irrigation under these conditions, as even a single stress event at this critical time of tuber development can cause high levels of malformed tubers and reduce processing quality.

In the Magic Valley area Dr. Nora Olsen reports that the only significant disease issues they are seeing are related to PVY infection of potatoes. The high temperatures in the area also appear to be putting some crops under stress as many which were almost at row closure last week still have not closed rows yet this week.

In east and north eastern part of the state Pocatello up through Tetonia), there have been no disease problems reported apart from some PVY issues. Many crops are at flowering now and should be at row closure in the next week or so. As with other parts of the state hot days and warm nights are forecast for the next couple of days so it is imperative to adjust irrigation schedules to account for the increase in water demand by the crop. Increased stress on the plants can make them more susceptible to disease and insect problems.

For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases

» 1193_1.pdf

Potato Pest Alert for the week ending 6-26-2015

Potato    All Locations

Posted on: June 26, 2015 by Phill Wharton

Dr. Mike Thornton reports that there are not a lot of disease issues coming through the door right now. In the Treasure Valley area, we are seeing a little bit of early blight on lower leaves, especially on plants that are stressed due to virus infection or other issues. Speaking of stress, the hot days and warm nights forecast for the next week or so can be very hard on potato plants. To reduce the incidence of physiological disorders like sugar ends, it is important to adjust irrigation schedules to account for the increase in water demand by the crop. Growers cannot afford to get behind on irrigation under these conditions, as even a single stress event at this critical time of tuber development can cause high levels of malformed tubers and reduce processing quality.

In the Magic Valley area Dr. Nora Olsen reports that the only significant disease issues they are seeing are related to PVY infection of potatoes. The high temperatures in the area also appear to be putting some crops under stress as many which were almost at row closure last week still have not closed rows yet this week.

In east and north eastern part of the state Pocatello up through Tetonia), there have been no disease problems reported apart from some PVY issues. Many crops are at flowering now and should be at row closure in the next week or so. As with other parts of the state hot days and warm nights are forecast for the next couple of days so it is imperative to adjust irrigation schedules to account for the increase in water demand by the crop. Increased stress on the plants can make them more susceptible to disease and insect problems.

For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases

» 1193_1.pdf

Potato Pest Alert for the week ending 6-19-2015

Potato    All Locations

Posted on: June 19, 2015 by Phill Wharton

The weather has finally turned and the sun has come out. In most growing areas this week temperatures have been in the 80’s or higher. With the dry warm weather across the snake river valley the risk of a late blight outbreak is low. However, micro-climates may exist in fields where conditions are conducive for late blight. Areas such as low spots where soil moisture is highest and parts of the field shaded by windbreaks are examples of areas where scouting should be intensified. For information on what fungicides to use for managing late blight see the article recently published by Dr. Jeff Miller of Miller Research and Dr. Phill Wharton from UI (http://bit.ly/1Q4tmty).

In the Treasure Valley area and western Idaho most potato crops are now past row closure and the first reports of early blight are starting to come in. For information on early blight control see (http://bit.ly/1CinqBN). Whatever product you use to control early blight it is always recommended that you tank mix it with a protectant fungicide such as Chlorothalonil or Dithane, unless the product already contains it (e.g. Gavel or Zing!). This reduces the chances of fungicide resistance development.

In the Magic Valley area most crops are just at row closure and it is around this time that growers should be making their first application for early blight/ white mold control. Dr. Jeff Miller reports that in fields that didn't receive an insecticide treatment at planting, Colorado beetles are beginning to appear.

In east and north eastern part of the state (Pocatello up through Tetonia) crops are between the 6-8” stage and touching in the rows. There have not been any reports of disease problems this week. If you are growing a variety which is susceptible to black dot, or have had problems with black dot in the past, the 6-8” plant stage is the optimal timing to apply a black dot control product such as a strobilurin (Quadris Top, Gem, Reason, Headline etc).

For up to date information on potato diseases in Idaho and across the country follow us on
twitter. http://www.twitter.com/potatodiseases

Potato Pest Alert for the week ending 6-19-2015

Potato    All Locations

Posted on: June 19, 2015 by Phill Wharton

The weather has finally turned and the sun has come out. In most growing areas this week temperatures have been in the 80’s or higher. With the dry warm weather across the snake river valley the risk of a late blight outbreak is low. However, micro-climates may exist in fields where conditions are conducive for late blight. Areas such as low spots where soil moisture is highest and parts of the field shaded by windbreaks are examples of areas where scouting should be intensified. For information on what fungicides to use for managing late blight see the article recently published by Dr. Jeff Miller of Miller Research and Dr. Phill Wharton from UI (http://bit.ly/1Q4tmty).

In the Treasure Valley area and western Idaho most potato crops are now past row closure and the first reports of early blight are starting to come in. For information on early blight control see (http://bit.ly/1CinqBN). Whatever product you use to control early blight it is always recommended that you tank mix it with a protectant fungicide such as Chlorothalonil or Dithane, unless the product already contains it (e.g. Gavel or Zing!). This reduces the chances of fungicide resistance development.

In the Magic Valley area most crops are just at row closure and it is around this time that growers should be making their first application for early blight/ white mold control. Dr. Jeff Miller reports that in fields that didn't receive an insecticide treatment at planting, Colorado beetles are beginning to appear.

In east and north eastern part of the state (Pocatello up through Tetonia) crops are between the 6-8” stage and touching in the rows. There have not been any reports of disease problems this week. If you are growing a variety which is susceptible to black dot, or have had problems with black dot in the past, the 6-8” plant stage is the optimal timing to apply a black dot control product such as a strobilurin (Quadris Top, Gem, Reason, Headline etc).

For up to date information on potato diseases in Idaho and across the country follow us on
twitter. http://www.twitter.com/potatodiseases

Another Lso-positive psyllid found in an Idaho potato field

Potato    All Locations

potato psyllids

Posted on: June 19, 2015 by Erik Wenninger

June 19, 2015 – Another Lso-positive psyllid found in a potato field

No psyllids collected last week were positive; however, one of the psyllids collected this week from a Twin Falls County potato field tested positive for Lso, the bacterium that causes zebra chip. A few psyllids collected this week remain to be tested.

Psyllid abundance this week was similar to last week. Potato psyllids were found this week in the following counties: Payette, Canyon, Gooding, Jerome (two fields), and Twin Falls (two fields).

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Another Lso-positive psyllid found in an Idaho potato field

Potato    All Locations

potato psyllids

Posted on: June 19, 2015 by Erik Wenninger

June 19, 2015 – Another Lso-positive psyllid found in a potato field

No psyllids collected last week were positive; however, one of the psyllids collected this week from a Twin Falls County potato field tested positive for Lso, the bacterium that causes zebra chip. A few psyllids collected this week remain to be tested.

Psyllid abundance this week was similar to last week. Potato psyllids were found this week in the following counties: Payette, Canyon, Gooding, Jerome (two fields), and Twin Falls (two fields).

We continue to urge growers and crop consultants to have an IPM program in place and to supplement our monitoring program with their own local monitoring.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Potato Pest Alert for the week ending 6-12-2015

Potato    All Locations

Posted on: June 12, 2015 by Phill Wharton

Pest Alert for the week ending 6-12-2015

Welcome to the new weekly potato disease update for southern Idaho. For the rest of the growing season we will be posting weekly disease updates from around the potato growing regions in southern Idaho.

Dr. Mike Thornton reports that rows are closed/closing in most fields in the Treasure Valley region so growers are focused on late blight/ early blight/ white mold fungicide applications. There have been reports from across the state of some seed lots with relatively high incidences of PVY. With all the excess rain that we had in May, some growers are reporting problems with Fusarium seed piece decay after planting (see http://bit.ly/1FdrZNw for more information).

With the wet May weeds have been more of a problem this spring and are expected to be a problem as the season progresses. Dr. Pam Hutchinson produced a handy article on how to deal with weeds in your potatoes this year (http://bit.ly/1MPv3pq).

The very mild winter we had has also led to a big problem this year with volunteer potatoes showing up across the state (http://bit.ly/1Thgv6p). Volunteer potatoes can harbor diseases such as late blight and increase the risk of a late blight epidemic. For information on what fungicides to use for managing late blight see the article recently published by Dr. Jeff Miller of Miller Research and Dr. Phill Wharton from UI (http://bit.ly/1Q4tmty).

For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases

» http://bit.ly/1FdrZNw

» http://bit.ly/1Thgv6p

» http://bit.ly/1Q4tmty

Potato Pest Alert for the week ending 6-12-2015

Potato    All Locations

Posted on: June 12, 2015 by Phill Wharton

Pest Alert for the week ending 6-12-2015

Welcome to the new weekly potato disease update for southern Idaho. For the rest of the growing season we will be posting weekly disease updates from around the potato growing regions in southern Idaho.

Dr. Mike Thornton reports that rows are closed/closing in most fields in the Treasure Valley region so growers are focused on late blight/ early blight/ white mold fungicide applications. There have been reports from across the state of some seed lots with relatively high incidences of PVY. With all the excess rain that we had in May, some growers are reporting problems with Fusarium seed piece decay after planting (see http://bit.ly/1FdrZNw for more information).

With the wet May weeds have been more of a problem this spring and are expected to be a problem as the season progresses. Dr. Pam Hutchinson produced a handy article on how to deal with weeds in your potatoes this year (http://bit.ly/1MPv3pq).

The very mild winter we had has also led to a big problem this year with volunteer potatoes showing up across the state (http://bit.ly/1Thgv6p). Volunteer potatoes can harbor diseases such as late blight and increase the risk of a late blight epidemic. For information on what fungicides to use for managing late blight see the article recently published by Dr. Jeff Miller of Miller Research and Dr. Phill Wharton from UI (http://bit.ly/1Q4tmty).

For up to date information on potato diseases in Idaho and across the country follow us on twitter. http://www.twitter.com/potatodiseases

» http://bit.ly/1FdrZNw

» http://bit.ly/1Thgv6p

» http://bit.ly/1Q4tmty

First Lso-positive psyllid found in a potato field in Idaho

Potato    All Locations

potato psyllids

Posted on: June 12, 2015 by Erik Wenninger

One of the psyllids (from Ada County) that we found last week in potato fields tested positive for Lso, the bacterium that causes zebra chip. The remaining psyllids that we collected last week tested negative for Lso.

This week we found more psyllids on sticky traps in potato fields in the following counties: Canyon, Ada, Gooding (two different fields), and Twin Falls (two different fields). In addition, suspected potato psyllids from a field in Owyhee County and an additional field in Canyon County are being shipped to us for confirmation, which should occur on Monday.

Last week, in a partnership with ISDA, we inspected for potato psyllids on tomato and pepper plants at four different retail nurseries in the Twin Falls area and found no psyllids. This week we inspected four different retail nurseries in the Burley area and found one tomato plant with many psyllid nymphs. These are being tested for Lso. The importance of retail nurseries in harboring potato psyllids and Lso remains to be clarified, but this is one possible source of the disease.

We continue to urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields, especially near the recent findings of Lso-positive psyllids.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

First Lso-positive psyllid found in a potato field in Idaho

Potato    All Locations

potato psyllids

Posted on: June 12, 2015 by Erik Wenninger

One of the psyllids (from Ada County) that we found last week in potato fields tested positive for Lso, the bacterium that causes zebra chip. The remaining psyllids that we collected last week tested negative for Lso.

This week we found more psyllids on sticky traps in potato fields in the following counties: Canyon, Ada, Gooding (two different fields), and Twin Falls (two different fields). In addition, suspected potato psyllids from a field in Owyhee County and an additional field in Canyon County are being shipped to us for confirmation, which should occur on Monday.

Last week, in a partnership with ISDA, we inspected for potato psyllids on tomato and pepper plants at four different retail nurseries in the Twin Falls area and found no psyllids. This week we inspected four different retail nurseries in the Burley area and found one tomato plant with many psyllid nymphs. These are being tested for Lso. The importance of retail nurseries in harboring potato psyllids and Lso remains to be clarified, but this is one possible source of the disease.

We continue to urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields, especially near the recent findings of Lso-positive psyllids.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as Lso testing results come in.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Potato psyllids found in more potato fields and bittersweet

Potato    All Locations

potato psyllids

Posted on: June 5, 2015 by Erik Wenninger

The one potato psyllid that we found in a potato field last week tested negative for Lso, the bacterium that causes zebra chip.

This week we found more potato psyllids in potato fields, including one psyllid on a sticky trap in each of five different fields (three in Canyon County, one in Ada County, and one in Jerome County). We also found one psyllid in a vacuum sample from a different Jerome County field.

From our bittersweet nightshade sites, we found 25 potato psyllids from among three of our sites in Twin Falls County and one psyllid from one of our Ada county sites.

This week, in a partnership with ISDA, we inspected for potato psyllids on tomato and pepper plants at four different retail nurseries in the Twin Falls area. Although we had found potato psyllids in nurseries in previous years, we were unable to find any during this inspection.

We continue to urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Potato psyllids found in more potato fields and bittersweet

Potato    All Locations

potato psyllids

Posted on: June 5, 2015 by Erik Wenninger

The one potato psyllid that we found in a potato field last week tested negative for Lso, the bacterium that causes zebra chip.

This week we found more potato psyllids in potato fields, including one psyllid on a sticky trap in each of five different fields (three in Canyon County, one in Ada County, and one in Jerome County). We also found one psyllid in a vacuum sample from a different Jerome County field.

From our bittersweet nightshade sites, we found 25 potato psyllids from among three of our sites in Twin Falls County and one psyllid from one of our Ada county sites.

This week, in a partnership with ISDA, we inspected for potato psyllids on tomato and pepper plants at four different retail nurseries in the Twin Falls area. Although we had found potato psyllids in nurseries in previous years, we were unable to find any during this inspection.

We continue to urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Potato Pest Update

Potato    Treasure Valley

Colorado potato beetle & Potato psyllid

Posted on: June 2, 2015 by Stuart Reitz

1) Dr. Mike Thornton reports that adult Colorado potato beetles are being found on volunteer plants in the Treasure Valley. They have not yet been seen in commercial fields, but this is the time of year that growers should be out actively scouting field edges for insects. This is especially true if fields did not receive an at-planting insecticide application.

2) A single potato psyllid adult was captured on a sticky trap in Malheur County. Potato growers in the Treasure Valley are encouraged to closely monitor their fields. For management information, please see: http://www.uidaho.edu/extension/news/psyllid-management/recommendations or contact your local extension office.

First 2015 potato psyllid found in ID potato field & first 2

Potato    All Locations

potato psyllids and ZC

Posted on: May 29, 2015 by Erik Wenninger

We collected our first samples from potato fields this week, and found a potato psyllid on a sticky trap in a field in Twin Falls County. This is the first psyllid we’ve found in a potato field this season and the only one we’ve found in potato so far this week (though we are waiting to receive cards for several sites).

In addition, of the 8 adult psyllids we collected last week from bittersweet nightshade in Twin Falls County, three (one each from three different sites in the canyon) tested positive for Lso, the bacterium that causes zebra chip. This is the first time that we have ever found positive psyllids from our bittersweet nightshade samples.

Given that this is the earliest we have ever found potato psyllids in potato and the first time we have ever found positive psyllids from bittersweet nightshade, we strongly urge growers and crop consultants to have an IPM program in place and to begin local monitoring of fields.

Consult our website for more information, including online spreadsheets that show details of the psyllid captures in potato fields.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

2015 Potato psyllid monitoring program underway

Potato    All Locations

potato psyllids

Posted on: May 22, 2015 by Erik Wenninger

The University of Idaho, in collaboration with Miller Research and several crop consultants across the state is continuing our monitoring program for potato psyllids, zebra chip, and liberibacter (Lso), the bacterium that causes zebra chip.

Monitoring on 17 of our “Light” sites began last week (all in the Treasure Valley) and 4 of our “Intense” sites (all in the Magic Valley) with the deployment of sticky cards. We found no potato psyllids on cards at any of these sites this week. Deployment of sticky cards began on many more sites this week as well. We expect to have a total of around 75 “Light” sites and 13 “Intense” sites across the state; this is similar to last year.

Online spreadsheets showing details of the psyllid captures in potato fields will go live next week.

We have been monitoring for psyllids within presumed overwintering habitat, including bittersweet nightshade and field bindweed sites, and we found 8 adult potato psyllids and many nymphs on bittersweet nightshade this week in Twin Falls County (no psyllids were found in Treasure Valley sites this week). These psyllids are now in transit to Moscow to be tested for Lso.

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://www.uidaho.edu/extension/news/psyllid-management

» http://www.uidaho.edu/extension/news/psyllid-management

Weed management in potatoes

Potato    All Locations

Weeds

Posted on: May 21, 2015 by Pam Hutchinson

I’ve had many calls about weed control in potatoes because of high rainfall amounts, excessive soil moisture this spring.
Please see the attached WORD document for my thoughts on what may happen - what are the possibilities for weed control in potatoes due to these conditions.

» Rain and Weed Control in Potatoes-2015

Update on Idaho Potato Psyllid Monitoring

Potato    All Locations

potato psyllids

Posted on: May 1, 2015 by Erik Wenninger

The University of Idaho, in collaboration with Miller Research and several crop consultants across the state will continue our monitoring program for potato psyllids, zebra chip, and liberibacter (Lso), the bacterium that causes zebra chip. The monitoring program covers commercial potato fields throughout southern Idaho and is funded in part by IPC, ISDA, and USDA. More details on the program will be forthcoming, but it will be similar to what we’ve done over the last two years.

We have been monitoring for psyllids during the off-season within presumed overwintering habitat, including bittersweet nightshade and field bindweed sites, as well as within last year’s potato plots at the Kimberly Research & Extension Center (which have been bare soil all winter). We’ve been finding psyllids in relatively low numbers on bittersweet nightshade and field bindweed intermittently throughout the off-season, but for the first time since last fall we found several potato psyllids on sticky cards within the bare fields at KREC. It is too early to tell what kind of psyllid year we will have, but finding apparently dispersing psyllids this early (during the previous three years psyllids had not appeared until June) suggests that we all should be on the lookout early this year for potato psyllids.

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

» http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

tomato and potato late blight brochure

Potato    Treasure Valley

late blight

Posted on: April 7, 2015 by Jerry Neufeld

Attached is a pdf from Dr. Phill Wharton, U of Idaho Potato Pathologist, with information about Tomato and Potato late blight, and 10 tips to prevent late blight.

» 1158_1.pdf

2014 Miller Research Potato Pest Management Seminar

Potato    All Locations

Posted on: October 29, 2014 by Jeff Miller

The 2014 Miller Research Potato Pest Management Seminar will be held Wednesday, December 10 and Tuesday, December 16. Please see the attached flier for program information. The same program will be held on both days. There is not cost to attend and lunch will be provided. Please RSVP to Jeff Miller (jeff@millerresearch.com or 431-4420) so that we that can plan accordingly. 3 CCA (Integrated Pest Management) and 3 ISDA credits are available.

» 1132_1.pdf

Idaho potato psyllid monitoring update

Potato    All Locations

potato psyllids

Posted on: October 10, 2014 by Erik Wenninger

All of the potato fields we have been monitoring have been vine killed. We are still monitoring a few harvested fields and our overwintering sites. In the coming weeks we will put together a summary of the monitoring results from this year.

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

Idaho Psyllid Monitoring Update

Potato    All Locations

Potato Psyllids

Posted on: October 3, 2014 by Erik Wenninger

Only one potato psyllid was found this week, in Twin Falls County, at one of our “intense” monitoring fields. Very few fields remain as we are nearing the end of the season. None of the psyllids tested from last week was positive for liberibacter (Lso), the bacterium that causes zebra chip.

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

potato psyllid update

Potato    All Locations

potato psyllids

Posted on: September 26, 2014 by Erik Wenninger

Most of our fields have now undergone vine kill and are no longer being monitored. The busy harvest season has delayed delivery to our lab of some cards from this week (including those from a few sites in western Idaho that have been trapping the most potato psyllids); those results will be posted as early as possible next week. Among the few remaining sites still being monitored, we did trap one psyllid in Cassia County (the first capture at that site this year) and a few psyllids at two different sites in Canyon County.

In addition, a psyllid that was collected from a Canyon County field on Sept 8 tested positive for liberibacter, the bacterium that causes zebra chip.

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

potato psyllid and ZC update

Potato    All Locations

potato psyllids

Posted on: September 19, 2014 by Erik Wenninger

Potato psyllids continue to be trapped at relatively high rates in just a few fields in Western Idaho (Canyon, Owyhee, and Elmore counties). We also trapped one psyllid in a field in Jerome County this week. None of the psyllids tested from last week was positive for liberibacter (Lso), the bacterium that causes zebra chip. During this busy harvest season, we are still waiting for some cards to come into our lab, so those results will be posted as early as possible next week.

Many of the fields we are monitoring have undergone vine kill. For those fields that have yet to be vine killed, it is important to consider management options for psyllids and zebra chip in order to keep the crop protected until harvest—especially in western Idaho where psyllid numbers have been higher.

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

One more Lso-positive psyllid found in Idaho

Potato    All Locations

potato psyllids

Posted on: September 12, 2014 by Erik Wenninger

A potato psyllid collected from a grower’s field in Owyhee County last week tested positive for liberibacter (Lso), the bacterium that causes zebra chip disease. This psyllid was collected on a sticky trap in the same field that trapped an Lso-positive psyllid two weeks before. During this week we trapped an additional eight psyllids (average of two per card) in that same field that will be tested for Lso. We also trapped psyllids in a few other sites in Canyon and Elmore Counties this week. Again, psyllid captures were higher this week in western Idaho than central and eastern Idaho; only one psyllid was found on a sticky trap in the Magic Valley this week (Twin Falls County).

Many of the fields we are monitoring have undergone vine kill. For those fields that have yet to be vine killed, it is important to consider management options for psyllids and zebra chip in order to keep the crop protected until harvest—especially in western Idaho where psyllid numbers have been higher.

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

Idaho psyllid monitoring update

Potato    All Locations

potato psyllids

Posted on: September 5, 2014 by Erik Wenninger

Potato psyllid captures in our monitoring program were at similar levels to the previous two weeks (i.e., slightly higher than in previous weeks, though still relatively low compared to previous years). Again, most psyllids—nearly all this week—were found in the Treasure Valley (Canyon and Owyhee Counties) or Elmore County. In addition we captured one psyllid at a site in Twin Falls County. Psyllid numbers were the highest we’ve seen yet this year (1.25 or 1.75 on average per card). This is not surprising given the trend of increasing psyllid numbers toward the end of the season that we have observed during the last two years. It is important to consider management options for psyllids and zebra chip in order to keep the crop protected until harvest.

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

One more Lso-positive psyllid found in Idaho

Potato    All Locations

potato psyllids

Posted on: August 29, 2014 by Erik Wenninger

Potato psyllid captures in our monitoring program slightly increased last week and remained at similar levels this week. Most psyllids during the last two weeks were found in the Treasure Valley (Canyon, Payette, Owyhee Counties) or Elmore County.

In addition, one of the psyllids collected in Owyhee County last week tested positive for Lso (liberibacter; the bacterium that causes zebra chip). This is only the second psyllid that has tested positive so far in the commercial fields we have been monitoring.

We typically observe an increase in psyllid captures at the end of the growing season; however, it is likely that the heavy rains we have experienced recently have affected psyllid numbers. It is important to consider management options for psyllids and zebra chip in order to keep the crop protected until harvest.

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

Idaho Psyllid Monitoring Update

Potato    All Locations

Potato Psyllids

Posted on: August 22, 2014 by Erik Wenninger

Potato psyllid captures in our monitoring program slightly increased this week in terms of numbers (but remain relatively low compared to previous monitoring years) and locations (Magic and Treasure Valleys). Psyllids were found on sticky traps in commercial potato fields in Owyhee, Canyon, Ada, Elmore, and Twin Falls Counties.
None of the psyllids found so far in commercial fields (except for one on Canyon County during mid-July) has tested positive for Lso (liberibacter; the bacterium that causes zebra chip).


Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:


https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0


Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:


https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0



More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.



http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

potato psyllid update

Potato    All Locations

potato psyllids

Posted on: August 15, 2014 by Erik Wenninger

Potato psyllid captures in our monitoring program were similar to recent weeks in terms of numbers (relatively low) and locations (Magic and Treasure Valleys). Psyllids were found on sticky traps in commercial potato fields in Canyon, Ada, Jerome, and Twin Falls Counties. This represents the first potato psyllid captured in Ada County in our monitoring network this year. We also captured four psyllids in vacuum samples at bittersweet nightshade sites in Twin Falls County.

None of the psyllids found so far in commercial fields (except for one on Canyon County during mid-July) has tested positive for Lso (liberibacter; the bacterium that causes zebra chip).

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

Idaho psyllid monitoring update

Potato    All Locations

potato psyllids

Posted on: August 8, 2014 by Erik Wenninger

Relatively few potato psyllids were captured in our monitoring program this week overall, and, similar to recent weeks, most psyllids captured were found in the Magic Valley. Of these, most were found in fields in Twin Falls County, though we did find two psyllids in a field in Minidoka County this week (the first finds this year in this county). In addition, we found a psyllid in Canyon County and, for the first time this year, in Payette County.

None of the psyllids found so far in commercial fields (except for one on Canyon County during mid-July) has tested positive for Lso (liberibacter; the bacterium that causes zebra chip).

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/

potato psyllid update

Potato    All Locations

potato psyllids

Posted on: August 1, 2014 by Erik Wenninger

Few potato psyllids were captured in our monitoring program this week overall, and psyllids were found this week only in Twin Falls County (however, results from several Treasure Valley sites have not yet been returned to us). One of these was a nymph, found in a vacuum sample from a commercial field; this is the first nymph found this summer in our monitoring program. In addition to the few psyllids found in our network of commercial potato fields, we also found four psyllids on yellow sticky cards near bittersweet nightshade sites in Twin Falls County, and several potato psyllids on sticky cards and in vacuum samples taken from insecticide trials at the Kimberly R&E Center. Nearly all of the Idaho Potato Team has been at the Potato Association of America meetings in Spokane this week. We regret the delay this has caused in testing psyllids for Lso (liberibacter; the bacterium that causes zebra chip). Samples are currently being processed and we expect to post results to the spreadsheets below by early next week.

Detailed results for the “intense” fields, which are monitored with 10 sticky traps, vacuum samples, and leaf samples are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdG15WTNRMkEteHRWRGhpM2ltSXBiR3c#gid=0

Detailed results for the “light” fields, which are monitored with 4 sticky traps are here:

https://docs.google.com/spreadsheet/ccc?key=0AuZRwfbNUs2YdGVrX2t2NGs0YzlYYUZaQkNaejhES2c#gid=0

More information and resources on potato psyllids and zebra chip, including management and scouting recommendations, can be found at the link below.

http://extension.uidaho.edu/kimberly/tag/potato-psyllid-and-zebra-chip/