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Psyllid captures dropped this week
Potato All Locations
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/
Psyllid captures per field similar to last week
Potato All Locations
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/
Psyllid captures tick up slightly, but still relatively low
Potato All Locations
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/
Final Ag Talk Tuesday session for 2023 - August 15
All Crops All Locations
General announcement - all crops
Posted on: August 14, 2023 by Kasia Duellman
The final Ag Talk Tuesday session will be held tomorrow, August 15, at 11:00 AM (MT) - via Zoom.
Topics:
- Economics Outlook — Pat Hatzenbuehler
- Crop Insurance 101 — Bryan C. Ayers, Program Analyst, Risk Management Agency Education Division, USDA)
Registration is required. You can register here: https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
More information on Ag Talk Tuesdays can be found on our website: https://www.uidaho.edu/extension/news/ag-talk-tuesday
» https://www.uidaho.edu/extension/news/ag-talk-tuesday
» https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
2023 Idaho Association of Plant Protection
All Crops All Locations
Posted on: August 10, 2023 by Jeff Miller
Anybody interested in learning about plant diseases and pests important in Idaho is invited to the 2023 Idaho Association of Plant Protection annual meeting, November 1-2 in Rupert, ID.
Attached is the first announcement and call for participation in the IAPP. See details on the attached page. If you have any questions, please contact the chairs for this year:
Albert Adjesiwor, aadjesiwor@uidaho.edu
John Snelling, jsnelling@rogueseedproduction.com
Please share with any who may be interested.
Psyllid captures remain low; no new positives
Potato All Locations
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/
IPM Field Days - Aberdeen and Parma
All Crops All Locations
General announcement - all crops
Posted on: August 9, 2023 by Kasia Duellman
Join us at the Aberdeen Research & Extension Center for a Potato IPM Field Day on Wednesday August 16, 2023. Registration begins at 8:30 AM. The tour starts at 9:00 AM and ends at Noon. Attendees are eligible for 1 ISDA pesticide credit and 3 CCA credits. A free lunch will be provided at the tour's conclusion.
Location:
University of Idaho - Aberdeen REC
1693 S 2700 W
Aberdeen, ID 83210
Following the Aberdeen Potato IPM Field Day, head over to Parma and Join University of Idaho Extension Specialists and Researchers on Thursday August 17, 2023 for IPM Field Day at Parma with registration beginning at 7:15 a.m. and Field Tour starting promptly at 8:00 a.m. until 10:30 a.m.
Location:
University of Idaho - Parma REC
29603 U of I Lane
Parma, ID 83660-6699
» https://webpages.uidaho.edu/extension-seed-potato/events.html
Psyllid captures still relatively low
Potato All Locations
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
No new positive psyllids this week
Potato All Locations
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
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
IPM Field Dat at UI Extension Parma Research & Extension Center
All Crops Treasure Valley, Treasure Valley - Idaho, Magic Valley
Posted on: July 18, 2023 by Brad Stokes
Join University of Idaho Extension Specialists and Researchers on Thursday August 17, 2023 for IPM Field Day at Parma with registration beginning at 7:15 a.m. and Field Tour starting promptly at 8:00 a.m. until 10:30 a.m.
Ag Talk Tuesday July 18 "Rocks and Spuds"
All Crops All Locations
Ag Talk Tuesday July 18, 2023
Posted on: July 17, 2023 by Pamela Hutchinson
Featured Topic:
July 18 — Rocks
and Spuds — Kamren
Koompin, Idaho grower/producer — Pamela J.S. Hutchinson (moderator)
Welcome
to the 2023 season of Ag Talk Tuesday, presented by University of
Idaho Extension every first and third Tuesday May-August, 11:00 AM to Noon (via Zoom).
Tomorrow's session will
feature Idaho grower Kamren Koompin's talk "Rocks and Spuds" following the usual crop updates.
Registration is required. For
more information and the registration link, please check out the Ag Talk Tuesday website:
https://www.uidaho.edu/extension/news/ag-talk-tuesday
You can also register for Ag Talk Tuesday by following this link:
https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
If you miss the live sessions, videos are available on the University of Idaho College of Ag/Life Sciences YouTube channel: https://www.youtube.com/playlist?list=PL6g6ZYcM47s85ASnhBlMHbFMD-x-zAGt6
Remaining
Session Featured Topics and dates:
Aug. 1 — CALS Update
(speaker: Dean Michael Parrella)
Aug. 15 — Economics
Outlook (speaker: Pat Hatzenbuehler)
Hope you can attend
these live, online sessions (via Zoom).
» https://www.uidaho.edu/extension/news/ag-talk-tuesday
» https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
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
2023 Miller Research Potato Pest Management Field Day
Potato All Locations
Posted on: July 11, 2023 by Jeff Miller
» https://millerresearch.com/event/2023-miller-research-potato-pest-management-field-day/
Want Pesticide Credits?
All Crops All Locations
Pesticide Credits
Posted on: July 10, 2023 by Kimberly Tate
Enroll in the University of Idaho (UI) Extension Pesticide Safety Education Program (PSEP) for the 2023 Summer Series Webinars (via Zoom; no camera/no account required). Each webinar is $10 per applicator. Completed webinar(s) receive multi-state pesticide credit(s). ISDA, ODA & WSDA credits available for completed webinar*. Note: ALL webinars are held at Mountain Daylight Time (MDT).
- Aug. 8 at 2 p.m. to 3 p.m. (MDT) — Desireè Wickwar: Turf insect management
- Aug. 15 at 2 p.m. to 3 p.m. (MDT) — Doug Finkelnburg: Seed bank dynamics for grassy weed control in agricultural systems
- Aug. 22 at 2 p.m. to 3 p.m. (MDT) — Dr. Pam Hutchinson & Dr. Albert Adjesiwor: Weather conditions and herbicide performance
*For pesticide credit: Pesticide applicators must answer questions within the webinar session. This requires individual computer and internet access for each user. Answers will be collected to confirm attendance was maintained for the entire webinar. Idaho State Department of Agriculture (ISDA), Oregon Department of Agriculture (ODA) and Washington State Department of Agriculture (WSDA) credits approved. Please register with your state license number(s).
Register Today: https://marketplace.uidaho.edu/C20272_ustores/web/store_main.jsp?STOREID=53&SINGLESTORE=true
Need more information? Contact Kimberly Tate, University of Idaho Extension PSEP Sr. Instructor by phone (208) 364-4581 or email ktate@uidaho.edu.
» UI Extension Pesticide Safety Education Summer Series Poster
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.
Southern / Southeastern Cereals Field Days coming up!
All Crops Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley
CEREALS ARE NOT A PEST!
Posted on: July 7, 2023 by Juliet Marshall
That's the name of our field days this year? Yes, it's true - come learn about the wheat and barley varieties that available to our area producers, cropping systems, fertility management and yes, those dang pests! What can be more fun that talking about smut? (Dwarf, loose, flag and cover your smut!) Scalds? Head blight?
Representatives from private industry, commissions and University of Idaho will be there, so hope to see you at one of the events!
» https://www.uidaho.edu/extension/cereals/scseidaho
Western Cherry Fruit Fly (Rhagoletis indifferens) Detected In Canyon and Gem Counties
Cherry Treasure Valley, Treasure Valley - Idaho
Western Cherry Fruit Fly (Rhagoletis indifferens)
Posted on: June 23, 2023 by Brad Stokes
Tree Fruits Treasure Valley
Western Cherry Fruit Fly (Rhagoletis indifferens)
Idaho State Department of Agriculture
On June 21st the first 2023 Western Cherry Fruit Fly was captured in an Idaho State Department of Agriculture WCFF trap was reported from Canyon and Gem County. With traps being placed in north Marsing and south Emmett cherry trees.
Historically we expect to find WCFF in Gem County traps about a week after the first one is found in Canyon County, this year they arrived on the same week.
» https://extension.usu.edu/pests/research/western-cherry-fruit-fly
» https://treefruit.wsu.edu/crop-protection/opm/western-cherry-fruit-fly/
Thinning Fruits - Cultural Practices
Tree Fruits Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley
Posted on: June 21, 2023 by Brad Stokes
2023 Fruit Thinning – June 21, 2023
Cultural Alert
Fruits which are crowded on limbs should be thinned. Apples, pears, Asian pears, apricots, plums, and peaches all respond positively to thinning. Cherries and nut trees are usually not thinned. Thinning fruit will 1) increase fruit size, 2) improve the trees productivity in the year to come, and 3) reduce limb breakage as fruits begin to size. Too many fruits on a tree translates into small fruit that is often of poor quality.
General rules for thinning: 1) the earlier the better, 2) remove smaller fruits and leave the larger ones, 3) remove fruits with disease spots, hail damage, or other defects, 4) aim for even spacing.
General guidelines by fruit – see links below for additional detail.
Apples & pears: Almost always need thinning. Should be thinned to one fruit per spur with a good spacing of one fruit per 6” of branch. Asian pears spaced at one fruit per 6-8” of branch. Be careful not to break off spurs while thinning – spurs produce flowers and fruit for many years if not broken. Recommend to thin apples within 40 days of full bloom and pears within 60 days of full bloom.
Peaches & nectarines: Should be spaced at one fruit per 6-8” of branch. Fruits that are joined should be removed. Recommend to thin peaches about 70 days past full bloom.
Plums: Should be thinned to have spacing at 6” between fruit along the branch.
Apricots: If tree experiences heavy fruit set thin fruit spaced to 3” along branch.
Trees will exhibit “June Drop” which is when the tree will naturally drop fruit. Some prefer to wait until this event happens to thin, however there are great advantages to thinning early. More details can be found in the links below.
https://extension.wsu.edu/maritimefruit/fruit-thinning-for-high-quality/
http://homeorchard.ucdavis.edu/8047.pdf or attach as PDF from complete reference library
Other reference:
https://extension.oregonstate.edu/gardening/berries-fruit/fruit-thinning
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 67oF 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 3rd.
Master Gardeners Confirm Squash Bugs are Active!
General Landscape and Garden Treasure Valley, Treasure Valley - Idaho
Squash Bug (Anasa tristis)
Posted on: June 20, 2023 by Brad Stokes
2023 Squash Bug – June 20, 2023
Squash Bug (Anasa tristis)
Squash bugs have been reported in Canyon County by an Idaho Master Gardener. It is time to check the underside of cucurbit (pumpkins and squash are the most attractive) leaves for the bronze-colored egg clusters. In addition, monitor plants for nymphs, adults and plants wilting due to feeding injury.
MANAGEMENT
Wooden boards, shingles, or heavy cardboard can be placed on the ground next to the host plant. Squash bugs tend to move under the board/object at night. In the morning, turn the object over and destroy the pest.
Hand-pick and destroy adults, nymphs or egg clusters. Other options include rolled duct tape around fingers to pull off egg clusters, cutting off the egg part of the leaf or applying petroleum jelly directly to the eggs. Increased success is achieved when started early in the season and done every 2 to 3 days to keep numbers low.
Cultural methods include sanitation, plating squash varieties that are more tolerant of squash bug feeding, crop rotation and time of planting.
Additional control methods can be found in the linked publications:
https://pnwhandbooks.org/insect/vegetable/vegetable-pests/common-vegetable/vegetable-crop-squash-bug
https://extension.usu.edu/pests/ipm/notes_ag/veg-squashbug
http://ipm.ucanr.edu/PMG/PESTNOTES/pn74144.html
Ag Talk Tuesday - June 20, 2023 session
All Crops All Locations
General announcment - all crops
Posted on: June 19, 2023 by Juliet Marshall
The ATT is very pleased to announce that tomorrow’s special guests include commission members of the Idaho Wine Commission! Join us for Mark Pasculli and Jake Cragin’s perspective on grape production in Idaho and the role the Idaho Wine Commission plays in the grape and wine industries!
The Ag Talk Tuesday format starts with crop updates from extension specialists and industry partners at 11 AM Mountain (10 AM Pacific) lasting 20-30 minutes, followed by an introduction to our highlighted speakers. By that time, the irrigation pipes should have been moved, the cows fed, and morning chores complete - perfect timing to jump online prior to lunch!
More information can be found on the Ag Talk Tuesday website: https://www.uidaho.edu/extension/news/ag-talk-tuesday
Registration is required. To register, copy and paste this link in your web browser: https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
See you June 20 - 11:00 AM!
Courtesy of your Ag Talk Tuesday coordinators:
Juliet Marshall
Kasia Duellman
Doug Finkelnburg
Pamela J.S. Hutchinson
Olga Walsh
» https://www.uidaho.edu/extension/news/ag-talk-tuesday
» https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
UI Extension Parma Field Day Tour
All Crops Treasure Valley, Treasure Valley - Idaho, Magic Valley
Field Tour - Parma
Posted on: June 13, 2023 by Brad Stokes
UI Extension Parma Research and Extension Center Agricultural Field Day is next Wednesday June 21st 2023 beginning at 8:00 a.m. with registration of participants. The Field tour located at the UI Parma Research & Extension Center (29603 U of I Ln, Parma, ID 83660) will last until 11:15 a.m. with 2 CEU credits from Oregon Department of Agriculture and Certified Crop Assistants, 1 CEU credit from Idaho State Department of Agriculture. No need to pre-register and this is a FREE event. For further information contact James Woodhall, Olga Walsh or Brad Stokes.
2023 Peach Tree Borer
All Crops Treasure Valley, Treasure Valley - Idaho
Posted on: June 7, 2023 by Ruth Givens
Peachtree bores are predicted to emerge between June 15 and July 18. This pest is a concern for stone fruits: Peach, nectarine, apricot, cherry, and plum. Key symptoms of peachtree borer infestation is the presence of sawdust and frass mixed with the gummy substance near the base of the trunk. Prevention is the best method of control.
Larvae injure the fruit tree primarily by burrowing into the tree trunks just at or below the soil line but may enter trunk up to 12” above the soil line. Larvae feed in the cambium beneath the bark girdling the tree.
Chemical Control, Home Use: For orchards less than 1 acre, or for home yard trees, preventative trunk sprays are the primary control. Apply the first application immediately after first trap catch and repeat application based on product label guidelines. Follow the required pre-harvest interval (time between last application and allowed harvest of fruit) of insecticide product. Apply insecticide as a bark drench at a rate of 1⁄2 to 1 gallon of spray mix per tree. Thoroughly cover the lower 12 inches of trunk and soak the ground at the base of tree. Do not allow the sprays to contact fruit. For chemical option review the PNW handbook link below.
Chemical Control, Commercial: Reference the PNW handbook link below to see spring and summer application recommendations.
Cultural Control: Larvae inside the trunks can be killed by inserting a wire into entry holes. Kill larvae in the late summer and fall before they spend the winter and inflict their most extensive feeding damage the following spring. Keep base of tree free of vegetation – heat and dryness reduce the survival of eggs and larvae.
The following links have information about the life cycle of peachtree borer and control methods.
https://pnwhandbooks.org/insect/tree-fruit/peach-nectarine/peach-nectarine-peachtree-borer
https://extension.colostate.edu/topic-areas/insects/peach-tree-borer-5-566/
https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1651&context=extension_curall
UI Extension 2023 Cereals Field Days (Southern/Eastern Idaho)
All Crops Eastern Idaho, Magic Valley
Posted on: June 6, 2023 by Brad Stokes
UI Extension Cereals Field Days Schedule for 2023 (Southern/Eastern Idaho).
Psyllid captures dropped this week
Potato All Locations
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
Potato All Locations
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
Potato All Locations
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/
Final Ag Talk Tuesday session for 2023 - August 15
All Crops All Locations
General announcement - all crops
Posted on: August 14, 2023 by Kasia Duellman
The final Ag Talk Tuesday session will be held tomorrow, August 15, at 11:00 AM (MT) - via Zoom.
Topics:
- Economics Outlook — Pat Hatzenbuehler
- Crop Insurance 101 — Bryan C. Ayers, Program Analyst, Risk Management Agency Education Division, USDA)
Registration is required. You can register here: https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
More information on Ag Talk Tuesdays can be found on our website: https://www.uidaho.edu/extension/news/ag-talk-tuesday
» https://www.uidaho.edu/extension/news/ag-talk-tuesday
» https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
2023 Idaho Association of Plant Protection
All Crops All Locations
Posted on: August 10, 2023 by Jeff Miller
Anybody interested in learning about plant diseases and pests important in Idaho is invited to the 2023 Idaho Association of Plant Protection annual meeting, November 1-2 in Rupert, ID.
Attached is the first announcement and call for participation in the IAPP. See details on the attached page. If you have any questions, please contact the chairs for this year:
Albert Adjesiwor, aadjesiwor@uidaho.edu
John Snelling, jsnelling@rogueseedproduction.com
Please share with any who may be interested.
» IAPP_2023_Meeting_Invitation.pdf
Psyllid captures remain low; no new positives
Potato All Locations
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/
IPM Field Days - Aberdeen and Parma
All Crops All Locations
General announcement - all crops
Posted on: August 9, 2023 by Kasia Duellman
Join us at the Aberdeen Research & Extension Center for a Potato IPM Field Day on Wednesday August 16, 2023. Registration begins at 8:30 AM. The tour starts at 9:00 AM and ends at Noon. Attendees are eligible for 1 ISDA pesticide credit and 3 CCA credits. A free lunch will be provided at the tour's conclusion.
Location:
University of Idaho - Aberdeen REC
1693 S 2700 W
Aberdeen, ID 83210
Following the Aberdeen Potato IPM Field Day, head over to Parma and Join University of Idaho Extension Specialists and Researchers on Thursday August 17, 2023 for IPM Field Day at Parma with registration beginning at 7:15 a.m. and Field Tour starting promptly at 8:00 a.m. until 10:30 a.m.
Location:
University of Idaho - Parma REC
29603 U of I Lane
Parma, ID 83660-6699
» https://webpages.uidaho.edu/extension-seed-potato/events.html
Psyllid captures still relatively low
Potato All Locations
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
Potato All Locations
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/
IPM Field Dat at UI Extension Parma Research & Extension Center
All Crops Treasure Valley, Treasure Valley - Idaho, Magic Valley
Posted on: July 18, 2023 by Brad Stokes
Join University of Idaho Extension Specialists and Researchers on Thursday August 17, 2023 for IPM Field Day at Parma with registration beginning at 7:15 a.m. and Field Tour starting promptly at 8:00 a.m. until 10:30 a.m.
» IPM Field Day At Parma Flyer
Ag Talk Tuesday July 18 "Rocks and Spuds"
All Crops All Locations
Ag Talk Tuesday July 18, 2023
Posted on: July 17, 2023 by Pamela Hutchinson
Featured Topic:
July 18 — Rocks
and Spuds — Kamren
Koompin, Idaho grower/producer — Pamela J.S. Hutchinson (moderator)
Welcome
to the 2023 season of Ag Talk Tuesday, presented by University of
Idaho Extension every first and third Tuesday May-August, 11:00 AM to Noon (via Zoom).
Tomorrow's session will
feature Idaho grower Kamren Koompin's talk "Rocks and Spuds" following the usual crop updates.
Registration is required. For
more information and the registration link, please check out the Ag Talk Tuesday website:
https://www.uidaho.edu/extension/news/ag-talk-tuesday
You can also register for Ag Talk Tuesday by following this link:
https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
If you miss the live sessions, videos are available on the University of Idaho College of Ag/Life Sciences YouTube channel: https://www.youtube.com/playlist?list=PL6g6ZYcM47s85ASnhBlMHbFMD-x-zAGt6
Remaining
Session Featured Topics and dates:
Aug. 1 — CALS Update
(speaker: Dean Michael Parrella)
Aug. 15 — Economics
Outlook (speaker: Pat Hatzenbuehler)
Hope you can attend
these live, online sessions (via Zoom).
» https://www.uidaho.edu/extension/news/ag-talk-tuesday
» https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
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
» https://millerresearch.com/event/2023-miller-research-potato-pest-management-field-day/
» 2023_MR_Field_Day_Announcement.pdf
Want Pesticide Credits?
All Crops All Locations
Pesticide Credits
Posted on: July 10, 2023 by Kimberly Tate
Enroll in the University of Idaho (UI) Extension Pesticide Safety Education Program (PSEP) for the 2023 Summer Series Webinars (via Zoom; no camera/no account required). Each webinar is $10 per applicator. Completed webinar(s) receive multi-state pesticide credit(s). ISDA, ODA & WSDA credits available for completed webinar*. Note: ALL webinars are held at Mountain Daylight Time (MDT).
- Aug. 8 at 2 p.m. to 3 p.m. (MDT) — Desireè Wickwar: Turf insect management
- Aug. 15 at 2 p.m. to 3 p.m. (MDT) — Doug Finkelnburg: Seed bank dynamics for grassy weed control in agricultural systems
- Aug. 22 at 2 p.m. to 3 p.m. (MDT) — Dr. Pam Hutchinson & Dr. Albert Adjesiwor: Weather conditions and herbicide performance
*For pesticide credit: Pesticide applicators must answer questions within the webinar session. This requires individual computer and internet access for each user. Answers will be collected to confirm attendance was maintained for the entire webinar. Idaho State Department of Agriculture (ISDA), Oregon Department of Agriculture (ODA) and Washington State Department of Agriculture (WSDA) credits approved. Please register with your state license number(s).
Register Today: https://marketplace.uidaho.edu/C20272_ustores/web/store_main.jsp?STOREID=53&SINGLESTORE=true
Need more information? Contact Kimberly Tate, University of Idaho Extension PSEP Sr. Instructor by phone (208) 364-4581 or email ktate@uidaho.edu.
» UI Extension Pesticide Safety Education Summer Series Poster
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/
Southern / Southeastern Cereals Field Days coming up!
All Crops Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley
CEREALS ARE NOT A PEST!
Posted on: July 7, 2023 by Juliet Marshall
That's the name of our field days this year? Yes, it's true - come learn about the wheat and barley varieties that available to our area producers, cropping systems, fertility management and yes, those dang pests! What can be more fun that talking about smut? (Dwarf, loose, flag and cover your smut!) Scalds? Head blight?
Representatives from private industry, commissions and University of Idaho will be there, so hope to see you at one of the events!
» https://www.uidaho.edu/extension/cereals/scseidaho
» Schedule for Extension Variety Trials
Western Cherry Fruit Fly (Rhagoletis indifferens) Detected In Canyon and Gem Counties
Cherry Treasure Valley, Treasure Valley - Idaho
Western Cherry Fruit Fly (Rhagoletis indifferens)
Posted on: June 23, 2023 by Brad Stokes
Tree Fruits Treasure Valley
Western Cherry Fruit Fly (Rhagoletis indifferens)
Idaho State Department of Agriculture
On June 21st the first 2023 Western Cherry Fruit Fly was captured in an Idaho State Department of Agriculture WCFF trap was reported from Canyon and Gem County. With traps being placed in north Marsing and south Emmett cherry trees.
Historically we expect to find WCFF in Gem County traps about a week after the first one is found in Canyon County, this year they arrived on the same week.
» https://extension.usu.edu/pests/research/western-cherry-fruit-fly
» https://treefruit.wsu.edu/crop-protection/opm/western-cherry-fruit-fly/
Thinning Fruits - Cultural Practices
Tree Fruits Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley
Posted on: June 21, 2023 by Brad Stokes
2023 Fruit Thinning – June 21, 2023
Cultural Alert
Fruits which are crowded on limbs should be thinned. Apples, pears, Asian pears, apricots, plums, and peaches all respond positively to thinning. Cherries and nut trees are usually not thinned. Thinning fruit will 1) increase fruit size, 2) improve the trees productivity in the year to come, and 3) reduce limb breakage as fruits begin to size. Too many fruits on a tree translates into small fruit that is often of poor quality.
General rules for thinning: 1) the earlier the better, 2) remove smaller fruits and leave the larger ones, 3) remove fruits with disease spots, hail damage, or other defects, 4) aim for even spacing.
General guidelines by fruit – see links below for additional detail.
Apples & pears: Almost always need thinning. Should be thinned to one fruit per spur with a good spacing of one fruit per 6” of branch. Asian pears spaced at one fruit per 6-8” of branch. Be careful not to break off spurs while thinning – spurs produce flowers and fruit for many years if not broken. Recommend to thin apples within 40 days of full bloom and pears within 60 days of full bloom.
Peaches & nectarines: Should be spaced at one fruit per 6-8” of branch. Fruits that are joined should be removed. Recommend to thin peaches about 70 days past full bloom.
Plums: Should be thinned to have spacing at 6” between fruit along the branch.
Apricots: If tree experiences heavy fruit set thin fruit spaced to 3” along branch.
Trees will exhibit “June Drop” which is when the tree will naturally drop fruit. Some prefer to wait until this event happens to thin, however there are great advantages to thinning early. More details can be found in the links below.
https://extension.wsu.edu/maritimefruit/fruit-thinning-for-high-quality/
http://homeorchard.ucdavis.edu/8047.pdf or attach as PDF from complete reference library
Other reference:
https://extension.oregonstate.edu/gardening/berries-fruit/fruit-thinning
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 67oF 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 3rd.
Master Gardeners Confirm Squash Bugs are Active!
General Landscape and Garden Treasure Valley, Treasure Valley - Idaho
Squash Bug (Anasa tristis)
Posted on: June 20, 2023 by Brad Stokes
2023 Squash Bug – June 20, 2023
Squash Bug (Anasa tristis)
Squash bugs have been reported in Canyon County by an Idaho Master Gardener. It is time to check the underside of cucurbit (pumpkins and squash are the most attractive) leaves for the bronze-colored egg clusters. In addition, monitor plants for nymphs, adults and plants wilting due to feeding injury.
MANAGEMENT
Wooden boards, shingles, or heavy cardboard can be placed on the ground next to the host plant. Squash bugs tend to move under the board/object at night. In the morning, turn the object over and destroy the pest.
Hand-pick and destroy adults, nymphs or egg clusters. Other options include rolled duct tape around fingers to pull off egg clusters, cutting off the egg part of the leaf or applying petroleum jelly directly to the eggs. Increased success is achieved when started early in the season and done every 2 to 3 days to keep numbers low.
Cultural methods include sanitation, plating squash varieties that are more tolerant of squash bug feeding, crop rotation and time of planting.
Additional control methods can be found in the linked publications:
https://pnwhandbooks.org/insect/vegetable/vegetable-pests/common-vegetable/vegetable-crop-squash-bug
https://extension.usu.edu/pests/ipm/notes_ag/veg-squashbug
http://ipm.ucanr.edu/PMG/PESTNOTES/pn74144.html
» Squash Bug Eggs (Photo by: Hai Longworth)
» Squash Bug Adult (Photo by: Hai Longworth)
Ag Talk Tuesday - June 20, 2023 session
All Crops All Locations
General announcment - all crops
Posted on: June 19, 2023 by Juliet Marshall
The ATT is very pleased to announce that tomorrow’s special guests include commission members of the Idaho Wine Commission! Join us for Mark Pasculli and Jake Cragin’s perspective on grape production in Idaho and the role the Idaho Wine Commission plays in the grape and wine industries!
The Ag Talk Tuesday format starts with crop updates from extension specialists and industry partners at 11 AM Mountain (10 AM Pacific) lasting 20-30 minutes, followed by an introduction to our highlighted speakers. By that time, the irrigation pipes should have been moved, the cows fed, and morning chores complete - perfect timing to jump online prior to lunch!
More information can be found on the Ag Talk Tuesday website: https://www.uidaho.edu/extension/news/ag-talk-tuesday
Registration is required. To register, copy and paste this link in your web browser: https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
See you June 20 - 11:00 AM!
Courtesy of your Ag Talk Tuesday coordinators:
Juliet Marshall
Kasia Duellman
Doug Finkelnburg
Pamela J.S. Hutchinson
Olga Walsh
» https://www.uidaho.edu/extension/news/ag-talk-tuesday
» https://uidaho.zoom.us/meeting/register/tZwoceuqpzgrHtcuo-JwYrywKfEBP_jNgMcE#/registration
UI Extension Parma Field Day Tour
All Crops Treasure Valley, Treasure Valley - Idaho, Magic Valley
Field Tour - Parma
Posted on: June 13, 2023 by Brad Stokes
UI Extension Parma Research and Extension Center Agricultural Field Day is next Wednesday June 21st 2023 beginning at 8:00 a.m. with registration of participants. The Field tour located at the UI Parma Research & Extension Center (29603 U of I Ln, Parma, ID 83660) will last until 11:15 a.m. with 2 CEU credits from Oregon Department of Agriculture and Certified Crop Assistants, 1 CEU credit from Idaho State Department of Agriculture. No need to pre-register and this is a FREE event. For further information contact James Woodhall, Olga Walsh or Brad Stokes.
2023 Peach Tree Borer
All Crops Treasure Valley, Treasure Valley - Idaho
Posted on: June 7, 2023 by Ruth Givens
Peachtree bores are predicted to emerge between June 15 and July 18. This pest is a concern for stone fruits: Peach, nectarine, apricot, cherry, and plum. Key symptoms of peachtree borer infestation is the presence of sawdust and frass mixed with the gummy substance near the base of the trunk. Prevention is the best method of control.
Larvae injure the fruit tree primarily by burrowing into the tree trunks just at or below the soil line but may enter trunk up to 12” above the soil line. Larvae feed in the cambium beneath the bark girdling the tree.
Chemical Control, Home Use: For orchards less than 1 acre, or for home yard trees, preventative trunk sprays are the primary control. Apply the first application immediately after first trap catch and repeat application based on product label guidelines. Follow the required pre-harvest interval (time between last application and allowed harvest of fruit) of insecticide product. Apply insecticide as a bark drench at a rate of 1⁄2 to 1 gallon of spray mix per tree. Thoroughly cover the lower 12 inches of trunk and soak the ground at the base of tree. Do not allow the sprays to contact fruit. For chemical option review the PNW handbook link below.
Chemical Control, Commercial: Reference the PNW handbook link below to see spring and summer application recommendations.
Cultural Control: Larvae inside the trunks can be killed by inserting a wire into entry holes. Kill larvae in the late summer and fall before they spend the winter and inflict their most extensive feeding damage the following spring. Keep base of tree free of vegetation – heat and dryness reduce the survival of eggs and larvae.
The following links have information about the life cycle of peachtree borer and control methods.
https://pnwhandbooks.org/insect/tree-fruit/peach-nectarine/peach-nectarine-peachtree-borer
https://extension.colostate.edu/topic-areas/insects/peach-tree-borer-5-566/
https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1651&context=extension_curall
UI Extension 2023 Cereals Field Days (Southern/Eastern Idaho)
All Crops Eastern Idaho, Magic Valley
Posted on: June 6, 2023 by Brad Stokes
UI Extension Cereals Field Days Schedule for 2023 (Southern/Eastern Idaho).
» https://www.uidaho.edu/extension/cereals/scseidaho
» 2023 Cereal Schools Field Days Flyer (Schedule)
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