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Potato psyllid abundance similar to recent weeks; more Lso-p
Potato All Locations
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
corn earworm
Corn Treasure Valley
corn earworm
Posted on: August 6, 2015 by Jerry Neufeld
Below are the corn earworm moth counts from this morning, August 6. Corn earworm moths lay eggs in corn with fresh silk. Since silking is done for the year, this will be my last corn earworm count for the growing season.
Melba Area 0
South of Nampa 0
Middleton Area 0
Parma Area 8
Wilder Area 44
Homedale Area 4
Pride Lane 0
Spider Mites
All Crops Treasure Valley
Spider MItes
Posted on: July 31, 2015 by Stuart Reitz
Two-spotted spider mites are being found in bean and mint fields in the Treasure Valley. With the return of very hot weather, spider mite populations may build up rapidly to damaging levels.
Scout bean, mint and other susceptible crops, such as sugar beets, corn, and potato, to determine if action is necessary. For more information on two-spotted spider mites, consult the PNW Insect Handbook at the link below and contact the extension office.
More positive psyllids in Ada County; first Payette and Powe
Potato All Locations
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
Grape Mealybugs
All Crops Treasure Valley
grape mealybugs
Posted on: July 30, 2015 by Jerry Neufeld
Large numbers of male grape mealybugs have been found in two of the pheromone lure traps in the winegrape research vineyard trial plots in Parma between 7/23 and 7/29 . Mealybugs damage grapes by contaminating clusters with cottony egg sacs, larvae, adults, and honeydew. To date, we have not seen any evidence of crawlers, egg sacs or females on any winegrape vines in the vineyard trial plots.
In the winegrape research trial plots we have made 3 pesticide applications for mealybug this season- a late dormant oil, an early season and a July 17 foliar application of Provado (thiacloprid) - so it is likely that we are trapping males from a source outside of the winegrape trial plots. Susceptibility to mealybug damage varies by variety. It is worse on varieties that produce clusters close to the base of the shoot because the fruit often touches old wood. There is also the potential for the grape mealybug to vector leaf roll virus in grapes. For more information on this pest, including photos and management strategies, visit http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug and http://www.ipm.ucdavis.edu/PMG/r302301811.html.
» http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug
Grape Mealybugs
All Crops Treasure Valley
grape mealybugs
Posted on: July 30, 2015 by Jerry Neufeld
Large numbers of male grape mealybugs have been found in two of the pheromone lure traps in the winegrape research vineyard trial plots in Parma between 7/23 and 7/29 . Mealybugs damage grapes by contaminating clusters with cottony egg sacs, larvae, adults, and honeydew. To date, we have not seen any evidence of crawlers, egg sacs or females on any winegrape vines in the vineyard trial plots.
In the winegrape research trial plots we have made 3 pesticide applications for mealybug this season- a late dormant oil, an early season and a July 17 foliar application of Provado (thiacloprid) - so it is likely that we are trapping males from a source outside of the winegrape trial plots. Susceptibility to mealybug damage varies by variety. It is worse on varieties that produce clusters close to the base of the shoot because the fruit often touches old wood. There is also the potential for the grape mealybug to vector leaf roll virus in grapes. For more information on this pest, including photos and management strategies, visit http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug and http://www.ipm.ucdavis.edu/PMG/r302301811.html.
» http://insect.pnwhandbooks.org/tree-fruit/apple/apple-grape-mealybug
Corn Earworm
Corn Treasure Valley
corn earworm
Posted on: July 30, 2015 by Jerry Neufeld
It appears corn earworm moths (adults) are starting to show up in slightly larger numbers, although, my trapping numbers are still fairly low. Below are the moth counts from this morning, July 30.
Melba Area 0
South of Nampa 0
Middleton Area 3
Parma Area 4
Wilder Area 18
Homedale Area 12
Pride Lane 0
I am not aware of Idaho treatment thresholds for this pest, however, the following excerpt was taken from an Extension Publication from Purdue University.
Management Guidelines
Corn Insect Control Recommendations: E-series 219-W (PDF)
For seed production fields, if 10 or more moths are captured in a pheromone trap for several consecutive nights, economic damage is possible. However, only fields silking and/or pollinating during this time are candidates for treatment.
You may want to step up your field scouting and work closely with your crop consultant to determine if a treatment is necessary.
» http://insect.pnwhandbooks.org/vegetable-seed/corn/corn-seed-corn-earworm-sweet-corn-only
» http://insect.pnwhandbooks.org/vegetable/vegetable-pests/hosts-and-pests/corn-sweet-corn-earworm
Pomology Program Annual Fruit Field Day
All Crops Treasure Valley
Posted on: July 29, 2015 by Jerry Neufeld
The University of Idaho Annual Fruit Field Day will be held on Friday August 28, 2015; 8:30 am to 1:00 pm at the U of I Parma Research and Extension Center Pomology Orchard and Vineyard site, about 4 miles north of Parma, Idaho. The registration will start at 8:30 am and program will start at 9:00 am (sharp). Click on the pdf below for more details.
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.
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
Corn Earworm
Corn Treasure Valley
corn earworm
Posted on: July 23, 2015 by Jerry Neufeld
I checked the corn earworm traps today. I found a few, but not too many. Below are the counts.
Location 7/16 7/23
Melba Area 0 0
South of Nampa 0 0
Middleton Area 0 0
Parma Area 0 0
Wilder Area 0 16
Homedale area 0 2
Pride Lane 0 0
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.
Late blight in Minidoka County
Potato All Locations
Late blight
Posted on: July 21, 2015 by Jeff Miller
Late blight has been positively identified in Minidoka County. It appears the infections resulted from a spore shower and it is likely that other fields are also affected. It is critical for growers to scout fields. Affected fields should be sprayed on a 7-day schedule. If thundershowers persist, a 7-day schedule is advised for all in the area. Management guidelines are available at the link below.
» http://www.millerresearch.com/alerts/pest-alerts/item/49-late-blight-management-2015
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
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
Corn Earworm
All Crops Treasure Valley
corn earworm
Posted on: July 17, 2015 by Jerry Neufeld
I checked the corn earworm traps yesterday and did not find any corn earworm adults. Below are the general locations of the traps.
Melba Area
South of Nampa
Middleton Area
Parma Area
Wilder Area
Homedale Area
Pride Lane
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
Corn Earworm
All Crops Treasure Valley
corn earworm
Posted on: July 6, 2015 by Jerry Neufeld
I am once again collaborating with Charter Seed Co. and Crookham Seed Co. on a project to trap corn earworm moths. Traps were set out in corn fields at various locations near Melba, Wilder, Homedale, Middleton and Parma. I will check the traps every few days and post the moth counts to this website.
There are a couple of models that can be used to predict the emergence of the summer generation of corn earworm moths. This is the generation of moths that lay eggs in corn that is silking at the time of their emergence.
One model uses January 1 as a biofix, 55 and 92 as the temperature parameters and predicts the summer moths will appear after 1300 growing degree days (GDD) and begin laying eggs in fresh corn silk. This model also estimates the eggs will hatch and larvae will begin feeding on corn ears 73 GDD later. According to this model, we will reach 1300 GDD in the Parma area on 7/13 and 1300 GDD in the Caldwell area on 7/14. Egg laying in most, if not all, Treasure Valley locations will take place about July 12 through July 15. This is about 10 to 14 days earlier than most years.
The second model simply uses 8/1 as the default date; the date the summer moths will emerge and begin laying eggs in fresh corn silk. I do not think this model will be of value this year. Moth counts from the traps will be posted next week when they are available.
corn earworm
All Crops Treasure Valley
corn earworm
Posted on: July 6, 2015 by Jerry Neufeld
I am once again collaborating with Charter Seed Co. and Crookham Seed Co. on a project to trap corn earworm moths. Traps were set out in corn fields at various locations near Melba, Wilder, Homedale, Middleton and Parma. I will check the traps every few days and post the moth counts to this website.
There are a couple of models that can be used to predict the emergence of the summer generation of corn earworm moths. This is the generation of moths that lay eggs in corn that is silking at the time of their emergence.
One model uses January 1 as a biofix, 55 and 92 as the temperature parameters and predicts the summer moths will appear after 1300 growing degree days (GDD) and begin laying eggs in fresh corn silk. This model also estimates the eggs will hatch and larvae will begin feeding on corn ears 73 GDD later. According to this model, we will reach 1300 GDD in the Parma area on 7/13 and 1300 GDD in the Caldwell area on 7/14. Egg laying in most, if not all, Treasure Valley locations will take place about July 12 through July 15. This is about 10 to 14 days earlier than most years.
The second model simply uses 8/1 as the default date; the date the summer moths will emerge and begin laying eggs in fresh corn silk. I do not think this model will be of value this year. Moth counts from the traps will be posted next week when they are available.
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
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
Small Grains Field Days - Idaho Falls and Aberdeen
Small Grains Eastern Idaho
Variety Trials and Cereal Pests
Posted on: June 30, 2015 by Juliet Marshall
Please join us for these upcoming Cereals Field Days!
Idaho Falls - July 9 starting at 4:00 PM at Marc Thiel’s: across the street from the house 2550 S 45th W, Idaho Falls, ID. Dinner to follow at Sealander Park. Contacts for additional for details: Derek Reed; (208) 390-7191 and derekreed33@gmail.com or Juliet.Marshall@uidaho.edu
Aberdeen - July 15th starting at 8:30 AM at the Aberdeen R&E Center, 1693 S 2700 W, Aberdeen, ID 83210. Contacts for additional details (and see attached flier) Dr. Jianli Chen; (208) 397-4162 or jchen@uidaho.edu and Juliet.Marshall@uidaho.edu
Small Grains Field Days - Idaho Falls and Aberdeen
Small Grains Eastern Idaho
Variety Trials and Cereal Pests
Posted on: June 30, 2015 by Juliet Marshall
Please join us for these upcoming Cereals Field Days!
Idaho Falls - July 9 starting at 4:00 PM at Marc Thiel’s: across the street from the house 2550 S 45th W, Idaho Falls, ID. Dinner to follow at Sealander Park. Contacts for additional for details: Derek Reed; (208) 390-7191 and derekreed33@gmail.com or Juliet.Marshall@uidaho.edu
Aberdeen - July 15th starting at 8:30 AM at the Aberdeen R&E Center, 1693 S 2700 W, Aberdeen, ID 83210. Contacts for additional details (and see attached flier) Dr. Jianli Chen; (208) 397-4162 or jchen@uidaho.edu and Juliet.Marshall@uidaho.edu
