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Small Grains Facing Big Issues

All Crops Eastern Idaho, Magic Valley

BYD< eyepsot, dorught and freezes

Posted on: May 11, 2026 by Juliet Marshall

There are many issues facing small
grains production this year beyond input costs and ROI. This is yet another
unique weather year with significant impacts on cereal crops. Starting in
October, temperatures were often above long-term averages, and fall planted
wheat and barley thrived. Aphids were abundant long into November. Early
planted crops were well-established and lush, and there were hopes for high
yields. Low temperatures over the fall and winter months were not low enough to
arrest plant growth.

My initial concerns
were that conditions favored aphids and spread of BYDV (barley yellow dwarf
virus), a plant virus transmitted by aphids. The other concern was that
conditions were optimal for plant infections of the fungi causing eyespot, favored
by short crop rotations, early seeding, high fall biomass, high seeding rates
and cool wet fall weather followed by a mild winter.

Growing Degree Days
(GDD) were high throughout winter resulting in crop growth advancing about a
month earlier than usual. Warm conditions resulted in continued water usage by
the crop leading to drought stress. The earliest irrigations could not start
until water was in the canals or ground water pumping was permitted. Consistent
high winds increased evapotranspiration and physical stress.

Mites also thrived
with high populations causing extensive plant damage in several areas.

While March was warm,
April became cold. Temperatures dove to the teens and twenties several nights,
and for several weeks in a row temperatures were consistently below freezing. Successive
freezes are damaging to winter grain in these advanced stages and also resulted
in delayed herbicide applications.

Taken individually,
let’s review possible management strategies.

1)
Aphid transmission of BYDV.

a.
Delayed fall planting to avoid high aphid
populations migrating in from other crops. Populations can build on corn, then
migrate to newly planted winter cereals. Barley yellow dwarf viruses, triticum
mosaic viruses and high plains viruses migrate with aphids, reducing plant growth
and yields. Cons: delayed planting reduces plant size going into the
winter and may reduce winter survival and subsequent yields. Larger plants have
larger more established crowns that survive cold temperatures and snow mold
infection (should there be a good snow year…)

b.
Insecticidal seed treatments reduce aphid
populations and limit the spread of viruses. Cons: Seed applied
insecticides are recommended for early plantings but are effective for limited
time after plant emergence. Seed treatment costs increase with added
insecticides and viruses may still be transmitted before insects are killed. As
plants continue to grow, the effectiveness of the insecticide is reduced over
time. There also is limited effectiveness in long, warm falls when no killing
frosts reduce aphid populations.

c.
Insecticide applications after crop
emergence directly kill aphids and prevent further colonization, also reducing
virus transmission. Cons: increased production / application costs, and potential
impacts on beneficial insects.

2)
Eyespot management.

a.
Increase crop rotation to promote soil
and plant health, reducing insect, nematode and fungal pathogen build up while
promoting sustainable ag ecosystems. Cons: are there any? Well yes,
environmental, economic and market forces may restrict rotational crop options.

b.
Reduce seeding rates to reduce the
environmental conditions that allow the fungal pathogens to proliferate (lush
fall growth). Winter cereals are effective at tillering to meet environmental
constraints. If there is plenty of space, plants will tiller more. Crowded
plants compete more with each other, resulting in weaker stems and taller plants
that lodge more. Crowded conditions also reduce airflow, increase moisture in
the lower canopy and promote stem-based infections of fungal pathogens. Cons:
fewer plants per acre may result in thin plant stands when conditions favor
winter kill.

c.
Delay fall planting, especially as
the growing seasons lengthen; to increase the chance that heavy frosts or
freezes kill aphids. Cons: planting of fall grains may conflict with
late harvests of potatoes and sugar beets. When there are limited planters and
large acreage to cover, getting everything planted in a timely fashion is
difficult.

d.
Apply triazole-based fungicides at herbicide
timing, before stem elongation to reduce impacts from fungal infection. Cons:
Timing of herbicide applications may be too late for optimum control of fungal
infections. Timely application of fungicides may require an additional field
operation that can add to input costs.

3)
Excessive fall growth due to favorable
weather conditions.

a.
Reduce seeding rates to prevent high plant
populations. Winter cereals compensate and tiller well to fit the environment. Cons:
It is hard to predict the fall and winter environment and the impact on grain
growth.

b.
Excessive growth can be managed with grazing to
reduce plant biomass and conditions that favor soil-borne fungi. Cons:
Accessibility of cattle to graze and fencing.

4)
Drought stress increases with warm
winters while plants continue to grow.

a.
Delay planting date to reduce excessive fall
growth and soil water usage. Cons: Long-term weather forecasts are
difficult, and conditions are more favorable for certain soilborne diseases.

b.
Minimize working the soil to reduce water loss. Cons:
poor seedbed preparation reduces uniform plant stand, especially following
harvest of root crops. No- or minimum-till practices are not possible with
potato and sugar beet crops.

5)
Freezing and Frost damage in spring.

a.
Delay fall planting. Early planting leads to
abundant plant growth. Cons: Warm winter conditions cannot be accurately
predicted.

b.
Irrigate well prior to winter to replenish soil
moisture. Drought conditions increase winter kill and advance plant growth
stages, leading to early heading. Cons: availability of irrigation for
winter cereals prior to winter.

6)
Mite damage in fall and spring

a.
Delay fall planting to reduce green bridge. Cons:
It is difficult to delay fall planting in dryland production which depends
foremost on soil moisture conditions.

b.
Insecticidal treatment to reduce mite
populations in the spring. Cons: Cost of application.

All of these issues
seem to be occurring simultaneously this year. Many winter cereal fields are
experiencing aphid-transmitted viral infections (BYDV-PAV, BYDV-MAV, CYDV,
triticum mosaic virus). Many winter barley fields are advanced in plant growth
stage, heading out early due to warm, dry conditions. Plants are stressed due
to drought. On top of very short plants, weeks of freezes in April have caused
extensive damage. Options include abandoning the crop, grazing or green-chop
remaining foliage or salvaging whatever remains, which won’t be much. Winter
barley has been the most affected by these conditions. After the freezes, about
50% of the heads are frozen and dead. Many stems of winter wheat and barley are
frozen at the base, collapsing stems, freezing heads in the boot, and resulting
in blackened lesions about an inch above the soil line.

Another option would
be to mow affected fields, allowing plants to tiller again from the base of the
plant. Roots are established and plants will develop new tillers. We do not
have data on yield potential under these circumstances, but it would produce
grazable forage or a minimum grain yield.

Contact your insurance
agent to have a loss adjuster estimate damage. You may be required to maintain
a representative strip. (Unfortunately, irrigating anything under current water
restrictions seems of limited value.) Be prompt in filing a notice of loss, as
it may take some time for an adjuster to survey the damage. Do not abandon or
destroy the crop until the crop (or field) is released by the adjuster.
(Disclaimer: I am not an insurance expert.)

This current situation
places us in an unenviable position of having greater spring yields than winter
grain yields. All of the suggestions discussed have economic factors that must
be weighed. And of course, some fields are more affected than others, even
within the same area. Please don’t hesitate to reach out for support, including
to the University of Idaho Farm Stress Team - Bracken Henderson (brackenh@uidaho.edu),
Lance Hanson (lancehansen@uidaho.edu), and David Callister (dcallister@uidaho.edu).

First codling moth flight of 2026 detected in Latah County

General Landscape and Garden Northern Idaho

Codling Moth

Posted on: May 8, 2026 by Samuel DeGrey

Multiple codling moths were captured in a monitoring trap in Moscow, Latah County, Idaho on May 6th, 2026.

The first detected flight date of May 6^th will serve as the biofix, or the date where we begin accumulating degree days, for Moscow, Idaho. Degree days provide an estimate for life cycle stages of insect pests, and can be a tool to better time management decisions for farmers, horticultural professionals, and gardeners.

Please visit our degree day dashboard to track degree days for codling moth in Moscow - https://pnwpestalert.net/gdd/index

Please consult the Pacific Northwest Pest Management handbook for degree-day based management recommendations for codling moth - https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth .

First apple codling moth flight of 2026 detected in Ada County

All Crops Eastern Idaho, Magic Valley, Treasure Valley, Treasure Valley - Idaho, Northern Idaho, Treasure Valley Oregon

Codling Moth

Posted on: May 8, 2026 by Sierra Laverty

First apple codling moth flight of 2026 detected in Ada County

Multiple codling moths were captured in a monitoring trap at Spaulding Ranch in Boise, Ada County, Idaho on May 1st, 2026.

May 1st will serve as the biofix for codling moth at the trapping site. Biofix is a specific, biological event used as a starting date for estimating the timeline of an insect’s lifecycle. An insect’s lifecycle is estimated using degree days (DD), which are units that measure how cold or warm an area is over time, based on if the average temperature is one degree above or below a specific base temperature. Adult codling moths were detected at 170 DD in Ada County. Please note that microclimates in the Treasure Valley are highly variable and your particular site may be colder or warmer than the monitoring site at Spaulding Ranch.

Management actions:

Thin fruit clusters to one fruit to reduce contact points between fruits now
Apply coverage insecticide sprays at 250 accumulated DD since May 1st or 420 total DD since January 1st. Another alert will be posted through PNW Pest Alert Network at that time.

To track degree days in the Treasure Valley, visit our website: https://pnwpestalert.net/gdd/index

Please consult the Pacific Northwest Pest Management Handbook for degree-day based management recommendations for codling moth: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

What is codling moth? Codling moth is a key insect pest of apples and pears in Idaho. Left unmanaged, it can cause "wormy" fruit and significant crop loss.

Identification – Know the Signs & Symptoms

Stage	Identification
Adult Moth	Grayish-brown, 1/2 inch long, with a coppery-brown band at wing tips.
Egg	Tiny, flat, and translucent – laid singly on fruit or leaves.
Larva	Creamy white to pink caterpillar with a dark brown head – this is the “worm.”
Pupa	Formed in bark crevices or leaf litter in silken cocoons.

Symptoms on Fruit:

Small, dark entry holes ("sting") on the apple surface.
Frass (sawdust-like excrement) near the hole.
Tunnels inside the fruit leading to the core.
Premature fruit drop in severe infestations.

Current Monitoring & Degree Days:

Biofix (first moths detected): May 1
Current Degree Days (base 50°F): 262 DD as of May 8
Egg hatch begins: 220-250 DD

Management Options

Non-Chemical Options

Fruit thinning: Thin clusters to one fruit to reduce contact points between fruits.
Fruit Bagging: Bag individual fruits to block larvae entry.
Sanitation: Remove dropped fruit and prune trees to reduce overwintering sites.

Coverage Insecticide Sprays

When: Apply at 250 DD after biofix (420 DD total since January 1st, based on 2026 monitoring)
Action: Apply insecticides to kill newly hatched larvae before they burrow into fruit.

For insecticide options: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

All pesticides, including least-toxic alternatives, have benefits and potential hazards. You must read and follow the pesticide label for specific directions, paying close attention to the directions for use and application rates. Inconsistent use of a product or disregarding the label is a violation of both state and federal laws.

For season-long control: Codling moth has multiple generations per season. Continue monitoring traps and tracking degree days to time follow-up sprays and other control measures.

For more assistance, contact your local University of Idaho Extension office: https://www.uidaho.edu/extension/directory/counties

» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

» https://climate.usu.edu/includes/pestFactSheets/Codling-Moth.pdf

» https://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/

Codling Moth Detected in Traps in Boise

General Landscape and Garden Treasure Valley, Treasure Valley - Idaho

Codling Moth

Posted on: May 8, 2026 by Sierra Laverty

First apple codling moth flight of 2026 detected in Ada County

Multiple codling moths were captured in a monitoring trap at Spaulding Ranch in Boise, Ada County, Idaho on May 1st, 2026.

Management actions:

Thin fruit clusters to one fruit to reduce contact points between fruits now
Apply coverage insecticide sprays at 250 accumulated DD since May 1st or 420 total DD since January 1st. Another alert will be posted through PNW Pest Alert Network at that time.

To track degree days in the Treasure Valley, visit our website: https://pnwpestalert.net/gdd/index

Please consult the Pacific Northwest Pest Management Handbook for degree-day based management recommendations for codling moth: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

What is codling moth? Codling moth is a key insect pest of apples and pears in Idaho. Left unmanaged, it can cause "wormy" fruit and significant crop loss.

Identification – Know the Signs & Symptoms

Stage	Identification
Adult Moth	Grayish-brown, 1/2 inch long, with a coppery-brown band at wing tips.
Egg	Tiny, flat, and translucent – laid singly on fruit or leaves.
Larva	Creamy white to pink caterpillar with a dark brown head – this is the “worm.”
Pupa	Formed in bark crevices or leaf litter in silken cocoons.

Symptoms on Fruit:

Small, dark entry holes ("sting") on the apple surface.
Frass (sawdust-like excrement) near the hole.
Tunnels inside the fruit leading to the core.
Premature fruit drop in severe infestations.

Current Monitoring & Degree Days:

Biofix (first moths detected): May 1
Current Degree Days (base 50°F): 262 DD as of May 8
Egg hatch begins: 220-250 DD

Management Options

Non-Chemical Options

Fruit thinning: Thin clusters to one fruit to reduce contact points between fruits.
Fruit Bagging: Bag individual fruits to block larvae entry.
Sanitation: Remove dropped fruit and prune trees to reduce overwintering sites.

Coverage Insecticide Sprays

When: Apply at 250 DD after biofix (420 DD total since January 1st, based on 2026 monitoring)
Action: Apply insecticides to kill newly hatched larvae before they burrow into fruit.

For insecticide options: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

For season-long control: Codling moth has multiple generations per season. Continue monitoring traps and tracking degree days to time follow-up sprays and other control measures.

For more assistance, contact your local University of Idaho Extension office: https://www.uidaho.edu/extension/directory/counties

» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

» https://climate.usu.edu/includes/pestFactSheets/Codling-Moth.pdf

» https://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/

2026 Snake River Weed Management Field Tour

All Crops All Locations

Posted on: May 6, 2026 by Russel Smith-Ollivierre

Mark your calendar for Thursday, June 11, 2026, and join us
at the Malheur Experiment Station for the first stop of the Snake River Weed
Research Tour.

This annual Field Day highlights ongoing weed management
research across the Treasure Valley of eastern Oregon and southwestern Idaho,
with a focus on key crops such as onion and sugar beet. This year’s program
also includes biofumigation cover crop trials. Walk the fields, see results
firsthand, and connect with OSU scientists and staff.

Attendees may receive up to three pesticide credits for
Oregon and Idaho.

Event Schedule

Location: Malheur Experiment Station, 595 Onion Ave,
Ontario, OR

Registration: 8:00–9:00 AM

Tour: 9:00 AM–12:00 PM

Lunch: Provided at noon

The event is free and open to all, but please RSVP to ensure
adequate lunch.

RSVP & Information

Jan Jones

541-889-2174

janet.jones@oregonstate.edu

Western Conifer Seed Bug capable of damaging PEX plumbing lines

General Landscape and Garden Northern Idaho

Western Conifer Seed Bug

Posted on: May 1, 2026 by Samuel DeGrey

Western Conifer Seed Bugs (Leptoglossus occidentalis,
often incorrectly referred to as "stink bugs" or "pine
beetles") are one of the west's most commonly encountered insect species.
While generally considered a mere nuisance due to the species' habit of
overwintering in human structures, western conifer seed bugs are actually
capable of damaging cross-linked polyethylene tubing (PEX) used in indoor
plumbing in many homes. When overwintering seed bugs are trapped indoors for
long periods of time during the colder months, they may attempt to
"taste" random objects with their piercing-sucking mouthparts, which
can cause leaks in the soft plastic when they pierce through the PEX line. See linked publication for further information, including on how to distinguish
western conifer seed bug damage from other forms of damage to plumbing lines.
Plastic outdoor irrigation line is unlikely to be at risk from seed bug
damage.

Homeowners have confirmed Western Conifer Seed Bug damage to
PEX plumbing line in Bonner County, Idaho in 2026. Years with increased seed
bug populations may represent higher risk of damage to pipelines. The end of
the colder months may represent a good time to inspect any indoor PEX line for
seed bug damage.

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/5D1C0B6A542A427186A697E39B9C92D0/S0008347X00002807a.pdf/damage-to-common-plumbing-materials-caused-by-overwintering-leptoglossus-occidentalis-hemiptera-coreidae.pdf

» https://www.cambridge.org/core/journals/canadian-entomologist/article/damage-to-common-plumbing-materials-caused-by-overwintering-leptoglossus-occidentalis-hemiptera-coreidae/5D1C0B6A542A427186A697E39B9C92D0

» Western Conifer Seed Bug (L. occidentalis)

Ag Talk Tuesday resumes for the 2026 season

All Crops All Locations

Posted on: May 1, 2026 by Kasia Duellman

Save the Date: Ag Talk Tuesday – 2026 Season

Please mark your calendars for the 2026 season of Ag Talk Tuesday, hosted by the University of Idaho Extension. Sessions will be held from 11:00 AM to Noon (MDT) on the first and third Tuesdays of each month, May through August.

We’ll kick off the season on May 5 with a water update.

Each Ag Talk Tuesday session begins with approximately 30 minutes of informal crop reports led by UI Extension personnel. All attendees are encouraged to participate and share observations or updates. The second half of the session features a more structured presentation on a timely agricultural topic, delivered by a guest speaker. An Ag Talk Tuesday organizer facilitates each session to guide discussion, gather crop updates, and moderate questions for the featured presentation.

Registration is free but required.
To register, please visit the Ag Talk Tuesday website:
https://www.uidaho.edu/extension/events/ag-talk

Or register directly using this link:
https://uidaho.zoom.us/meeting/register/xJRvquC7T66Czb_qpW0A_A#/registration

We hope you can join us for a productive and informative season of Ag Talk Tuesday!

Sincerely,
Your Ag Talk Tuesday Organizers

Emily Bedwell (ebedwell@uidaho.edu)
Kasia Duellman (kduellman@uidaho.edu)
Doug Finkelnburg (dougf@uidaho.edu)
Juliet Marshall (jmarshall@uidaho.edu)

» https://www.uidaho.edu/extension/events/ag-talk

Stripe Rust Observed on Cheatgrass – Vigilance Advised for Wheat Fields

All Crops Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Stripe Rust

Posted on: March 27, 2026 by Jemila Chellappa

» Strip_rust_on_cheat_1.jpg

Annual Survey

All Crops    Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Posted on: March 26, 2026 by Jemila Chellappa

We Didn’t Forget… We’re Getting Ready to Celebrate!
As we prepare to celebrate 25 years of the PNW Pest Alert Network, we want to hear from the people who made this journey possible — you!
Our Annual Survey is still open, and your feedback plays a critical role in shaping the future of pest alerts, GDD tools, and decision-support resources across Idaho and the Pacific Northwest.
Haven’t taken the survey yet? There’s still time!
Your input helps us:
Improve real-time pest alerts
Enhance GDD-based decision tools
Deliver more region-specific, actionable insights
Bonus!
Everyone who completes the survey will be entered into a Lucky Draw, and winners will be announced during our 25-Year Celebration on May 20th!
Don’t miss out:
✔ Share your feedback
✔ Enter the lucky draw
✔ Be part of our milestone celebration
Take the survey today!
*Crop Subscribers - https://uidaho.co1.qualtrics.com/jfe/form/SV_0BQQgjBpDHFSVNk
*Garden and Landscape Subscribers - https://uidaho.co1.qualtrics.com/jfe/form/SV_cUXPcTHHBz4qQsK
Thanks for your time taking the survey!

Early Pest Detections - Codling Moth & Peach Twig Borer

Apple    Treasure Valley, Treasure Valley - Idaho, Treasure Valley Oregon

Codling Moth & Peach Twig Borer

Posted on: March 24, 2026 by Jemila Chellappa

Pest Alert: Early Detection of Codling Moth & Peach Twig Borer
Location: Farmway & Karcher area, Treasure Valley, Idaho
Date: March 24, 2026
Backyard growers in the Farmway and Karcher area have reported early captures of key orchard pests in delta traps:
Codling moth (Cydia pomonella) – 1 adult captured
Peach twig borer (Anarsia lineatella) – 1 adult captured
These detections are earlier than typically expected, signaling that pest activity has begun in localized areas.
What This Means
This may represent early flight initiation (biofix approaching or beginning) for both pests.
Even low trap counts are important—they indicate the start of adult emergence.
Warmer early-season conditions may be accelerating development.
Recommended Actions for Growers
Deploy traps immediately if not already in place (especially in apples, pears, peaches, nectarines).
Check traps regularly (2–3 times per week) to monitor trends.
Record first consistent captures to establish a reliable biofix.
Begin tracking Growing Degree Days (GDD) for precise timing of:
Egg hatch (Codling moth)
Larval emergence (Peach twig borer)Why It Matters
Why It Matters
Accurate timing based on trap data + GDD allows for:
Improved spray timing
Reduced unnecessary pesticide applications
Better pest control and fruit protection
Stay Connected
Continue monitoring updates through the PNW Pest Alert Network for region-specific guidance and GDD-based recommendations.

Onion Growers Alert

All Crops    Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Cull Onion Disposal

Posted on: March 4, 2026 by Jemila Chellappa

Growers are reminded that the deadline to dispose of existing cull onion piles is March 15 to help prevent the buildup of onion pests such as onion maggot.
Key Requirements
All existing cull onion piles must be disposed of by March 15.
From March 15 to July 1, any new cull piles must be disposed of within one week of creation.
Proper disposal is essential to reduce pest development and protect nearby onion fields.
Management Options
If cull onions cannot be buried in a timely manner, piles may be treated with an approved insecticide labeled for cull piles or non-crop areas.
Approved options previously identified include:
Malathion products
Gowan Malathion 8 Flowable – EPA Reg. No. 10163-21
Malathion 5 EC – EPA Reg. No. 66330-220
(Malathion is generally the most economical option.)
Azadirachtin products
AzaGuard – EPA Reg. No. 70299-17
Ecozin Plus 1.2% ME – EPA Reg. No. 5481-559
Gowan Aza-Direct – EPA Reg. No. 71908-1-10163
Always read and follow pesticide label instructions before application.
Additional Regulations
In Malheur County, Oregon, no more than 80 tons of onion debris may be buried per acre.
State regulations related to onion maggot management and cull disposal can be found in the links below.
Additional Resources
Oregon rule: https://secure.sos.state.or.us/oard/viewSingleRule.action
Idaho rule (onion maggot section begins on page 8): https://adminrules.idaho.gov/rules/current/02/020605.pdf

» ODA Onion Maggot Cull Letter

» Pesticide Advisory Notice

» ISDA Cull Onion Brochure

2026 Miller Research Potato Pest Management Seminar

Potato    All Locations

Posted on: January 16, 2026 by Jeff Miller

The 2026 Miller Research Potato Pest Management Seminar will be Thursday, February 26 at the Historic Wilson Theater in Rupert. Cost is $30. ISDA and CCA credits have been requested. More details can be found on the attached page and link.

» https://millerresearch.com/event/2026-miller-research-potato-pest-management-seminar/

» 2026_Seminar_Announcement.pdf

Treasure Valley Onion School

All Crops    Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Posted on: December 19, 2025 by Jemila Chellappa

» Treasure_Valley_Onion_Workshop_Revised.pdf

2025 Idaho Association of Plant Protection - Nov. 5-6

All Crops    All Locations

Posted on: October 9, 2025 by Jeff Miller

The agenda for the 2025 Idaho Association of Plant Protection is attached. The cost to attend is $30 for standard registration and $20 for students. The fee is the same whether you attend one or both days. Payment can be made at the door and credit cards are accepted.
Attendees can earn 2 ISDA credits and 4 CCA Pest Management credits on Wednesday and 3 ISDA credits and 4 CCA Pest Management credits on Thursday.

» https://millerresearch.com/event/2025-idaho-association-of-plant-protection/

» IAPP_2025_Program.pdf

Pesticide Recertification Seminars

All Crops    Treasure Valley, Treasure Valley - Idaho, Treasure Valley Oregon

Posted on: October 6, 2025 by Jemila Chellappa

Upcoming Treasure Valley Cropping Systems Seminars: Pests and Pesticides
When: Monday, October 20 & Thursday, October 23, 2025
Where: 1904 E Chicago Street, Caldwell Research and Extension Centre, University of Idaho Extension, Caldwell, Idaho
Time: 10:00 AM – 12:00 PM both days
The Treasure Valley Cropping Systems Pests and Pesticide Seminars bring together Extension specialists and regulatory experts to provide the latest updates on insect pests and pesticide regulations for Idaho growers, applicators, and agricultural professionals. Each day features two focused, one-hour sessions followed by Q&A, offering practical, research-based information to strengthen IPM practices, improve decision-making, and ensure compliance.
Cost is free/ Registration required https://forms.office.com/r/B6wWQ6Q0x8?origin=lprLink
Pesticide Credits: 4 (2 for each day)
Monday, October 20, 2025 – Insect Pests of Treasure Valley Crops
10:00–11:00 AM – Insect Pests and Their Management in Treasure Valley Crops
Speaker: Dr. Armando Falcon-Brindis, University of Idaho Extension
→ Focus on key insect pests, thresholds, and integrated management strategies.
11:00 AM–12:00 PM – Classical and Emerging Horticulture Insects & Pathogens in Idaho
Speaker: Bradley Stokes, University of Idaho Extension
→ Highlights on invasive and established pests, safe pesticide use, and IPM in home and commercial horticulture.
Thursday, October 23, 2025 – Pesticides & Regulations
10:00–11:00 AM – Understanding Pesticide Chemistry: From Mode of Action to Resistance Management
Speaker: Dr. Marcelo Dimase, University of Idaho Extension
→ Learn how pesticide chemistry connects with field management and resistance prevention.
11:00 AM–12:00 PM – Navigating Pesticide Regulations and Compliance in Idaho
Speaker: Blaine Sterling, Idaho State Department of Agriculture (ISDA)
→ Review Idaho licensing, record-keeping, label interpretation, and compliance requirements.
Why Attend
Strengthen your IPM knowledge
Stay compliant with Idaho pesticide laws
Connect with Extension and ISDA experts
For more information or registration details, contact:
Jemila Chellappa, Ph.D.
Assistant Professor & Area Extension Educator – Cropping Systems
University of Idaho Extension, Southern Districts

» Oct 20 Seminar Flyer

» Oct 23 Seminar Flyer

Final potato psyllid monitoring update of 2025 season

Potato    All Locations

potato psyllid

Posted on: September 19, 2025 by Tasha Stanzak

This is the final report of the 2025 potato psyllid / Lso monitoring season.
Among the 11 psyllids captured last week, two tested positive for Lso, the bacterium associated with zebra chip disease (ZC).
Overall captures have been remarkably similar for the last three years. About 10% of all psyllids tested positive for Lso this year compared to about 4% last year and 6% the year before. The risk of ZC may have been slightly elevated this year by the prevalence of Los, but mitigated somewhat by relatively low psyllid captures. It is worth noting that nearly all of the Lso-positive psyllids were captured in the Magic Valley, with a few in the Treasure Valley, and none in the Upper Snake region.
Please remember that our research with Russet Burbank shows that ZC can develop during storage if infection occurs as late as two weeks before vine kill.
Thanks again to all of our cooperators who helped to deploy and retrieve so very many yellow sticky traps! And thanks to the growers who let us use their fields for this work!
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures decline overall, one new Lso-positive – 11 September 2025 update

Potato    All Locations

Posted on: September 11, 2025 by Tasha Stanzak

• This week we received traps from 21 fields that we are monitoring. Most fields have undergone vine kill and/or monitoring on them has otherwise ceased.
• We captured a total of 11 psyllids across 3 fields.
• Captures were from Canyon and Twin Falls counties.
• Among the 17 psyllids captured last week, one tested positive for Lso.
This is our last week reporting psyllid captures. Next week we will report on Lso incidence in psyllids captured this week. Psyllid captures from this week were relatively low overall. One of the psyllids from last week tested positive for Lso; this was the first Lso-positive psyllid since early August. Lso incidence this year has been relatively high, but thankfully the relatively low abundance of psyllids should mitigate risk of ZC somewhat. Nevertheless, we encourage you to maintain your IPM programs, especially in areas that have had higher captures of Lso-positive psyllids earlier this season. Next week we will post an end-of-season wrap up.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures still moderate, no new Lso – 4 September 2025 update

Potato    All Locations

potato psyllid

Posted on: September 4, 2025 by Erik Wenninger

• This week we received traps from 17 fields that we are monitoring. Many fields have undergone vine kill and/or monitoring on them has otherwise ceased.
• We captured a total of 17 psyllids across 6 fields.
• Captures were from Gooding, Jerome, and Twin Falls counties.
• Among the 43 psyllids captured last week, none tested positive for Lso.
Psyllid captures were on par with the low-to-moderate numbers that we saw during the past few years at this time. Thankfully all the psyllids from last week again tested negative for Lso; we haven’t had any Lso-positive psyllids since early August. This should have been the last week of reporting on psyllid captures, but the busy season delayed retrieval of traps from some fields, so we hope to have those numbers next week. In the meantime, we encourage you to maintain your IPM programs, especially in areas that have had higher captures of Lso-positive psyllids this season.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures tick up, no new Lso – 28 August 2025 update

Potato    All Locations

potato psyllid

Posted on: August 28, 2025 by Tasha Stanzak

• This week we received traps from 31 fields that we are monitoring.
• We captured a total of 43 psyllids across 14 fields.
• Captures were from Canyon, Gooding, and Twin Falls counties.
• Among the 14 psyllids captured last week, none tested positive for Lso.
Psyllid captures ticked up this week in both the Magic and Treasure valleys. This is not entirely surprising given that psyllid abundance very often spikes during August, though captures had been tracking much lower over the past several weeks. Thankfully all the psyllids from last week tested negative for Lso. Some fields have undergone vine kill and will no longer be monitored. Early harvest also limited person-power for trap retrieval from some sites, so those traps will be retrieved next week. We encourage you to maintain your IPM programs, especially in areas that have had higher captures of Lso-positive psyllids this season.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures still low, Lso still present – 21 August 2025 update

Potato    All Locations

potato psyllid

Posted on: August 21, 2025 by Tasha Stanzak

• This week we received traps from all 48 fields that we are monitoring.
• We captured a total of 14 psyllids across 8 fields.
• Captures were from Owyhee, Canyon, Gooding, Jerome, and Twin Falls counties.
• Among the 12 psyllids captured last week, 1 tested positive for Lso.
Psyllid captures this week remained quite low, and one more Lso-positive psyllid was captured last week. Overall captures this year have been low to modest with relatively high prevalence of Lso. Thankfully the low captures should help to mitigate the potential risk of ZC that may come with high prevalence of Lso. Interestingly, we still have yet to capture a potato psyllid in the Upper Snake region this year. Please maintain your IPM programs, especially in areas with higher captures of Lso-positive psyllids.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures lessen slightly, Lso is still present– 14 August 2025 update

Potato    All Locations

potato psyllid

Posted on: August 14, 2025 by Tasha Stanzak

• This week we received traps from all 48 fields that we are monitoring.
• We captured a total of 12 psyllids across 5 fields.
• Captures were from Payette, Canyon, Twin Falls, and Minidoka counties.
• Among the 24 psyllids captured last week, 2 tested positive for Lso.
Psyllid captures this week ticked down a bit from last week, and two more Lso-positive psyllids were captured last week. Overall captures this year have been modest with relatively high prevalence of Lso. Interestingly, we still have yet to capture a potato psyllid in the Upper Snake region this year. Please maintain your IPM programs, especially in areas with higher captures of Lso-positive psyllids.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Eastern Idaho Pest Alert

All Crops    Eastern Idaho

Posted on: August 13, 2025 by Jemila Chellappa

EASTERN IDAHO PEST ALERT
Serving Counties: Bannock, Bingham, Bonneville, Cassia, Fremont, Jefferson, Madison, Power, and Teton
Date: August 8, 2025 | Volume 6, Issue 13
Disease Spotlight: Fusarium Wilt
Cause: Soil-borne fungus Fusarium oxysporum
Crops Affected: Tomatoes, peppers, cucumbers, melons
Symptoms: Yellowing leaves, wilting, stunted growth, brown vascular tissue
Management: Resistant varieties, crop rotation, soil health, sanitation, biological controls, solarization, and avoiding overwatering.
Fall Tree & Shrub Planting Tips
Why Fall is Ideal: Cooler temps, more rain, and still-warm soil encourage root growth.
Key Practice: Root washing helps correct root deformities in container plants.
Tips: Dig wide (not deep), use native soil, water wisely, mulch properly, stake only if necessary.
Codling Moth Management
Timing: 2nd generation egg hatch in most areas has begun or passed. Continue protection through Sept. 15.
Spray Schedules: Vary by location and fruit damage history (see region-specific table on page 5).
Product Guidance:
Conventional options: Spectracide, Sevin, Malathion, Bonide, etc.
Organic options: Neem oil, Cyd-X, Spinosad, pyrethrin products.
Choose different products for each generation to prevent resistance.
Fireblight Control
When: Monitor symptoms ~2 weeks after full bloom; prune infected wood during dry weather.
Chemical Controls: Copper, lime sulfur, oxytetracycline, Actigard, etc.
Biological Controls: Include Streptomycin, Blossom Protect, Serenade Optimum, Regalia, and others.
Pruning Reminder: Always disinfect tools between cuts.
Upcoming Events
IDAHO HOME GARDEN TIPS:
Aug 12: Deer Proofing Your Yard – Sara Mahdavi @ 7 PM
Aug 19: Late Season Flowers – Andy West @ 7 PM
Aug 26: Dehydrating Your Harvest
Sept 9: Understanding Manures
Sept 23: Freeze Drying Your Harvest
PLANT TALK Q&A:
Ron Patterson & Reed Findlay – Aug 12 & Aug 19 @ 7:30 PM
Contact Info:
University of Idaho Extension – Bonneville County

» AUGUST 8, 2025| VOL. 6 ISS. 13

Position Announcement: Director, Foundation Seed and Parma Station

All Crops    All Locations

Foundation Seed Director

Posted on: August 12, 2025 by Juliet Marshall

We have a new position posted for the Foundation Seed Director and invite applicants to http://uidaho.peopleadmin.com/hr/postings/49200 for more information.

Title: Director, Foundation Seed and Parma Station
Department: Idaho Agricultural Experiment Station
Posting Number: SP004976P
Open until filled with a first consideration of 9/14.

» https://urldefense.com/v3/__https:/uidaho.peopleadmin.com/hr/shibboleth__;!!JYXjzlvb!nawX9EjbZ-Fdb81d3qsne_k7bA5n7m33rKZAg242sT7wRH1ip8hyPEjObujnqQCPgYS5LlbpAavdehyOZdTtaImN$

Reminder - Miller Research Potato Pest Management Field Day - August 20

Potato    All Locations

Posted on: August 12, 2025 by Jeff Miller

Come to the Miller Research Potato Pest Management Field Day on Wednesday, August 20. Registration begins at 8:30 with the field tour going from 9:00 AM to 12:00 PM.
Three ISDA pesticide recertification credits and three CCA IPM credits are available.
The cost to attend is $20 and lunch will be provided.

2025 marks our 50th anniversary! Come celebrate with us at the field day!

» https://millerresearch.com/event/2025-miller-research-potato-pest-management-field-day/

Reminder: Parma Field Day

All Crops    Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Posted on: August 11, 2025 by Jemila Chellappa

2025 Field Day at Parma

Small Grains Facing Big Issues

All Crops    Eastern Idaho, Magic Valley

BYD< eyepsot, dorught and freezes

Posted on: May 11, 2026 by Juliet Marshall

There are many issues facing small
grains production this year beyond input costs and ROI. This is yet another
unique weather year with significant impacts on cereal crops. Starting in
October, temperatures were often above long-term averages, and fall planted
wheat and barley thrived. Aphids were abundant long into November. Early
planted crops were well-established and lush, and there were hopes for high
yields. Low temperatures over the fall and winter months were not low enough to
arrest plant growth.

My initial concerns
were that conditions favored aphids and spread of BYDV (barley yellow dwarf
virus), a plant virus transmitted by aphids. The other concern was that
conditions were optimal for plant infections of the fungi causing eyespot, favored
by short crop rotations, early seeding, high fall biomass, high seeding rates
and cool wet fall weather followed by a mild winter.

Growing Degree Days
(GDD) were high throughout winter resulting in crop growth advancing about a
month earlier than usual. Warm conditions resulted in continued water usage by
the crop leading to drought stress. The earliest irrigations could not start
until water was in the canals or ground water pumping was permitted. Consistent
high winds increased evapotranspiration and physical stress.

Mites also thrived
with high populations causing extensive plant damage in several areas.

While March was warm,
April became cold. Temperatures dove to the teens and twenties several nights,
and for several weeks in a row temperatures were consistently below freezing. Successive
freezes are damaging to winter grain in these advanced stages and also resulted
in delayed herbicide applications.

Taken individually,
let’s review possible management strategies.

1)
Aphid transmission of BYDV.

a.
Delayed fall planting to avoid high aphid
populations migrating in from other crops. Populations can build on corn, then
migrate to newly planted winter cereals. Barley yellow dwarf viruses, triticum
mosaic viruses and high plains viruses migrate with aphids, reducing plant growth
and yields. Cons: delayed planting reduces plant size going into the
winter and may reduce winter survival and subsequent yields. Larger plants have
larger more established crowns that survive cold temperatures and snow mold
infection (should there be a good snow year…)

b.
Insecticidal seed treatments reduce aphid
populations and limit the spread of viruses. Cons: Seed applied
insecticides are recommended for early plantings but are effective for limited
time after plant emergence. Seed treatment costs increase with added
insecticides and viruses may still be transmitted before insects are killed. As
plants continue to grow, the effectiveness of the insecticide is reduced over
time. There also is limited effectiveness in long, warm falls when no killing
frosts reduce aphid populations.

c.
Insecticide applications after crop
emergence directly kill aphids and prevent further colonization, also reducing
virus transmission. Cons: increased production / application costs, and potential
impacts on beneficial insects.

2)
Eyespot management.

a.
Increase crop rotation to promote soil
and plant health, reducing insect, nematode and fungal pathogen build up while
promoting sustainable ag ecosystems. Cons: are there any? Well yes,
environmental, economic and market forces may restrict rotational crop options.

b.
Reduce seeding rates to reduce the
environmental conditions that allow the fungal pathogens to proliferate (lush
fall growth). Winter cereals are effective at tillering to meet environmental
constraints. If there is plenty of space, plants will tiller more. Crowded
plants compete more with each other, resulting in weaker stems and taller plants
that lodge more. Crowded conditions also reduce airflow, increase moisture in
the lower canopy and promote stem-based infections of fungal pathogens. Cons:
fewer plants per acre may result in thin plant stands when conditions favor
winter kill.

c.
Delay fall planting, especially as
the growing seasons lengthen; to increase the chance that heavy frosts or
freezes kill aphids. Cons: planting of fall grains may conflict with
late harvests of potatoes and sugar beets. When there are limited planters and
large acreage to cover, getting everything planted in a timely fashion is
difficult.

d.
Apply triazole-based fungicides at herbicide
timing, before stem elongation to reduce impacts from fungal infection. Cons:
Timing of herbicide applications may be too late for optimum control of fungal
infections. Timely application of fungicides may require an additional field
operation that can add to input costs.

3)
Excessive fall growth due to favorable
weather conditions.

a.
Reduce seeding rates to prevent high plant
populations. Winter cereals compensate and tiller well to fit the environment. Cons:
It is hard to predict the fall and winter environment and the impact on grain
growth.

b.
Excessive growth can be managed with grazing to
reduce plant biomass and conditions that favor soil-borne fungi. Cons:
Accessibility of cattle to graze and fencing.

4)
Drought stress increases with warm
winters while plants continue to grow.

a.
Delay planting date to reduce excessive fall
growth and soil water usage. Cons: Long-term weather forecasts are
difficult, and conditions are more favorable for certain soilborne diseases.

b.
Minimize working the soil to reduce water loss. Cons:
poor seedbed preparation reduces uniform plant stand, especially following
harvest of root crops. No- or minimum-till practices are not possible with
potato and sugar beet crops.

5)
Freezing and Frost damage in spring.

a.
Delay fall planting. Early planting leads to
abundant plant growth. Cons: Warm winter conditions cannot be accurately
predicted.

b.
Irrigate well prior to winter to replenish soil
moisture. Drought conditions increase winter kill and advance plant growth
stages, leading to early heading. Cons: availability of irrigation for
winter cereals prior to winter.

6)
Mite damage in fall and spring

a.
Delay fall planting to reduce green bridge. Cons:
It is difficult to delay fall planting in dryland production which depends
foremost on soil moisture conditions.

b.
Insecticidal treatment to reduce mite
populations in the spring. Cons: Cost of application.

All of these issues
seem to be occurring simultaneously this year. Many winter cereal fields are
experiencing aphid-transmitted viral infections (BYDV-PAV, BYDV-MAV, CYDV,
triticum mosaic virus). Many winter barley fields are advanced in plant growth
stage, heading out early due to warm, dry conditions. Plants are stressed due
to drought. On top of very short plants, weeks of freezes in April have caused
extensive damage. Options include abandoning the crop, grazing or green-chop
remaining foliage or salvaging whatever remains, which won’t be much. Winter
barley has been the most affected by these conditions. After the freezes, about
50% of the heads are frozen and dead. Many stems of winter wheat and barley are
frozen at the base, collapsing stems, freezing heads in the boot, and resulting
in blackened lesions about an inch above the soil line.

Another option would
be to mow affected fields, allowing plants to tiller again from the base of the
plant. Roots are established and plants will develop new tillers. We do not
have data on yield potential under these circumstances, but it would produce
grazable forage or a minimum grain yield.

Contact your insurance
agent to have a loss adjuster estimate damage. You may be required to maintain
a representative strip. (Unfortunately, irrigating anything under current water
restrictions seems of limited value.) Be prompt in filing a notice of loss, as
it may take some time for an adjuster to survey the damage. Do not abandon or
destroy the crop until the crop (or field) is released by the adjuster.
(Disclaimer: I am not an insurance expert.)

This current situation
places us in an unenviable position of having greater spring yields than winter
grain yields. All of the suggestions discussed have economic factors that must
be weighed. And of course, some fields are more affected than others, even
within the same area. Please don’t hesitate to reach out for support, including
to the University of Idaho Farm Stress Team - Bracken Henderson (brackenh@uidaho.edu),
Lance Hanson (lancehansen@uidaho.edu), and David Callister (dcallister@uidaho.edu).

First codling moth flight of 2026 detected in Latah County

General Landscape and Garden    Northern Idaho

Codling Moth

Posted on: May 8, 2026 by Samuel DeGrey

Multiple codling moths were captured in a monitoring trap in Moscow, Latah County, Idaho on May 6th, 2026.

The first detected flight date of May 6^th will serve as the biofix, or the date where we begin accumulating degree days, for Moscow, Idaho. Degree days provide an estimate for life cycle stages of insect pests, and can be a tool to better time management decisions for farmers, horticultural professionals, and gardeners.

Please visit our degree day dashboard to track degree days for codling moth in Moscow - https://pnwpestalert.net/gdd/index

Please consult the Pacific Northwest Pest Management handbook for degree-day based management recommendations for codling moth - https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth .

First apple codling moth flight of 2026 detected in Ada County

All Crops    Eastern Idaho, Magic Valley, Treasure Valley, Treasure Valley - Idaho, Northern Idaho, Treasure Valley Oregon

Codling Moth

Posted on: May 8, 2026 by Sierra Laverty

First apple codling moth flight of 2026 detected in Ada County
Multiple codling moths were captured in a monitoring trap at Spaulding Ranch in Boise, Ada County, Idaho on May 1st, 2026.

May 1st will serve as the biofix for codling moth at the trapping site. Biofix is a specific, biological event used as a starting date for estimating the timeline of an insect’s lifecycle. An insect’s lifecycle is estimated using degree days (DD), which are units that measure how cold or warm an area is over time, based on if the average temperature is one degree above or below a specific base temperature. Adult codling moths were detected at 170 DD in Ada County. Please note that microclimates in the Treasure Valley are highly variable and your particular site may be colder or warmer than the monitoring site at Spaulding Ranch.

Management actions:
Thin fruit clusters to one fruit to reduce contact points between fruits now
Apply coverage insecticide sprays at 250 accumulated DD since May 1st or 420 total DD since January 1st. Another alert will be posted through PNW Pest Alert Network at that time.

To track degree days in the Treasure Valley, visit our website: https://pnwpestalert.net/gdd/index
Please consult the Pacific Northwest Pest Management Handbook for degree-day based management recommendations for codling moth: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

What is codling moth? Codling moth is a key insect pest of apples and pears in Idaho. Left unmanaged, it can cause "wormy" fruit and significant crop loss.
Identification – Know the Signs & Symptoms
Stage
Identification
Adult Moth
Grayish-brown, 1/2 inch long, with a coppery-brown band at wing tips.
Egg
Tiny, flat, and translucent – laid singly on fruit or leaves.
Larva
Creamy white to pink caterpillar with a dark brown head – this is the “worm.”
Pupa
Formed in bark crevices or leaf litter in silken cocoons.
Symptoms on Fruit:
Small, dark entry holes ("sting") on the apple surface.
Frass (sawdust-like excrement) near the hole.
Tunnels inside the fruit leading to the core.
Premature fruit drop in severe infestations.

Current Monitoring & Degree Days:
Biofix (first moths detected): May 1
Current Degree Days (base 50°F): 262 DD as of May 8
Egg hatch begins: 220-250 DD

Management Options
Non-Chemical Options
Fruit thinning: Thin clusters to one fruit to reduce contact points between fruits.
Fruit Bagging: Bag individual fruits to block larvae entry.
Sanitation: Remove dropped fruit and prune trees to reduce overwintering sites.

Coverage Insecticide Sprays
When: Apply at 250 DD after biofix (420 DD total since January 1st, based on 2026 monitoring)
Action: Apply insecticides to kill newly hatched larvae before they burrow into fruit.

For insecticide options: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

All pesticides, including least-toxic alternatives, have benefits and potential hazards. You must read and follow the pesticide label for specific directions, paying close attention to the directions for use and application rates. Inconsistent use of a product or disregarding the label is a violation of both state and federal laws.

For season-long control: Codling moth has multiple generations per season. Continue monitoring traps and tracking degree days to time follow-up sprays and other control measures.
For more assistance, contact your local University of Idaho Extension office: https://www.uidaho.edu/extension/directory/counties

» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

» https://climate.usu.edu/includes/pestFactSheets/Codling-Moth.pdf

» https://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/

Codling Moth Detected in Traps in Boise

General Landscape and Garden    Treasure Valley, Treasure Valley - Idaho

Codling Moth

Posted on: May 8, 2026 by Sierra Laverty

First apple codling moth flight of 2026 detected in Ada County

Multiple codling moths were captured in a monitoring trap at Spaulding Ranch in Boise, Ada County, Idaho on May 1st, 2026.

May 1st will serve as the biofix for codling moth at the trapping site. Biofix is a specific, biological event used as a starting date for estimating the timeline of an insect’s lifecycle. An insect’s lifecycle is estimated using degree days (DD), which are units that measure how cold or warm an area is over time, based on if the average temperature is one degree above or below a specific base temperature. Adult codling moths were detected at 170 DD in Ada County. Please note that microclimates in the Treasure Valley are highly variable and your particular site may be colder or warmer than the monitoring site at Spaulding Ranch.

Management actions:
Thin fruit clusters to one fruit to reduce contact points between fruits now
Apply coverage insecticide sprays at 250 accumulated DD since May 1st or 420 total DD since January 1st. Another alert will be posted through PNW Pest Alert Network at that time.

To track degree days in the Treasure Valley, visit our website: https://pnwpestalert.net/gdd/index

Please consult the Pacific Northwest Pest Management Handbook for degree-day based management recommendations for codling moth: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

What is codling moth? Codling moth is a key insect pest of apples and pears in Idaho. Left unmanaged, it can cause "wormy" fruit and significant crop loss.
Identification – Know the Signs & Symptoms
Stage
Identification
Adult Moth
Grayish-brown, 1/2 inch long, with a coppery-brown band at wing tips.
Egg
Tiny, flat, and translucent – laid singly on fruit or leaves.
Larva
Creamy white to pink caterpillar with a dark brown head – this is the “worm.”
Pupa
Formed in bark crevices or leaf litter in silken cocoons.
Symptoms on Fruit:
Small, dark entry holes ("sting") on the apple surface.
Frass (sawdust-like excrement) near the hole.
Tunnels inside the fruit leading to the core.
Premature fruit drop in severe infestations.
Current Monitoring & Degree Days:
Biofix (first moths detected): May 1
Current Degree Days (base 50°F): 262 DD as of May 8
Egg hatch begins: 220-250 DD
Management Options
Non-Chemical Options
Fruit thinning: Thin clusters to one fruit to reduce contact points between fruits.
Fruit Bagging: Bag individual fruits to block larvae entry.
Sanitation: Remove dropped fruit and prune trees to reduce overwintering sites.
Coverage Insecticide Sprays
When: Apply at 250 DD after biofix (420 DD total since January 1st, based on 2026 monitoring)
Action: Apply insecticides to kill newly hatched larvae before they burrow into fruit.
For insecticide options: https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth
All pesticides, including least-toxic alternatives, have benefits and potential hazards. You must read and follow the pesticide label for specific directions, paying close attention to the directions for use and application rates. Inconsistent use of a product or disregarding the label is a violation of both state and federal laws.
For season-long control: Codling moth has multiple generations per season. Continue monitoring traps and tracking degree days to time follow-up sprays and other control measures.
For more assistance, contact your local University of Idaho Extension office: https://www.uidaho.edu/extension/directory/counties

» https://pnwhandbooks.org/insect/tree-fruit/apple/apple-codling-moth

» https://climate.usu.edu/includes/pestFactSheets/Codling-Moth.pdf

» https://extension.colostate.edu/topic-areas/insects/codling-moth-control-in-home-plantings-5-613/

2026 Snake River Weed Management Field Tour

All Crops    All Locations

Posted on: May 6, 2026 by Russel Smith-Ollivierre

Mark your calendar for Thursday, June 11, 2026, and join us
at the Malheur Experiment Station for the first stop of the Snake River Weed
Research Tour.
This annual Field Day highlights ongoing weed management
research across the Treasure Valley of eastern Oregon and southwestern Idaho,
with a focus on key crops such as onion and sugar beet. This year’s program
also includes biofumigation cover crop trials. Walk the fields, see results
firsthand, and connect with OSU scientists and staff.
Attendees may receive up to three pesticide credits for
Oregon and Idaho.
Event Schedule
Location: Malheur Experiment Station, 595 Onion Ave,
Ontario, OR
Registration: 8:00–9:00 AM
Tour: 9:00 AM–12:00 PM
Lunch: Provided at noon
The event is free and open to all, but please RSVP to ensure
adequate lunch.
RSVP & Information
Jan Jones
541-889-2174
janet.jones@oregonstate.edu

Western Conifer Seed Bug capable of damaging PEX plumbing lines

General Landscape and Garden    Northern Idaho

Western Conifer Seed Bug

Posted on: May 1, 2026 by Samuel DeGrey

Western Conifer Seed Bugs (Leptoglossus occidentalis,
often incorrectly referred to as "stink bugs" or "pine
beetles") are one of the west's most commonly encountered insect species.
While generally considered a mere nuisance due to the species' habit of
overwintering in human structures, western conifer seed bugs are actually
capable of damaging cross-linked polyethylene tubing (PEX) used in indoor
plumbing in many homes. When overwintering seed bugs are trapped indoors for
long periods of time during the colder months, they may attempt to
"taste" random objects with their piercing-sucking mouthparts, which
can cause leaks in the soft plastic when they pierce through the PEX line. See linked publication for further information, including on how to distinguish
western conifer seed bug damage from other forms of damage to plumbing lines.
Plastic outdoor irrigation line is unlikely to be at risk from seed bug
damage.

Homeowners have confirmed Western Conifer Seed Bug damage to
PEX plumbing line in Bonner County, Idaho in 2026. Years with increased seed
bug populations may represent higher risk of damage to pipelines. The end of
the colder months may represent a good time to inspect any indoor PEX line for
seed bug damage.
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/5D1C0B6A542A427186A697E39B9C92D0/S0008347X00002807a.pdf/damage-to-common-plumbing-materials-caused-by-overwintering-leptoglossus-occidentalis-hemiptera-coreidae.pdf

» https://www.cambridge.org/core/journals/canadian-entomologist/article/damage-to-common-plumbing-materials-caused-by-overwintering-leptoglossus-occidentalis-hemiptera-coreidae/5D1C0B6A542A427186A697E39B9C92D0

» Western Conifer Seed Bug (L. occidentalis)

Ag Talk Tuesday resumes for the 2026 season

All Crops    All Locations

Posted on: May 1, 2026 by Kasia Duellman

Save the Date: Ag Talk Tuesday – 2026 Season
Please mark your calendars for the 2026 season of Ag Talk Tuesday, hosted by the University of Idaho Extension. Sessions will be held from 11:00 AM to Noon (MDT) on the first and third Tuesdays of each month, May through August.
We’ll kick off the season on May 5 with a water update.
Each Ag Talk Tuesday session begins with approximately 30 minutes of informal crop reports led by UI Extension personnel. All attendees are encouraged to participate and share observations or updates. The second half of the session features a more structured presentation on a timely agricultural topic, delivered by a guest speaker. An Ag Talk Tuesday organizer facilitates each session to guide discussion, gather crop updates, and moderate questions for the featured presentation.
Registration is free but required.
To register, please visit the Ag Talk Tuesday website:
https://www.uidaho.edu/extension/events/ag-talk
Or register directly using this link:
https://uidaho.zoom.us/meeting/register/xJRvquC7T66Czb_qpW0A_A#/registration
We hope you can join us for a productive and informative season of Ag Talk Tuesday!
Sincerely,
Your Ag Talk Tuesday Organizers
Emily Bedwell (ebedwell@uidaho.edu)
Kasia Duellman (kduellman@uidaho.edu)
Doug Finkelnburg (dougf@uidaho.edu)
Juliet Marshall (jmarshall@uidaho.edu)

» https://www.uidaho.edu/extension/events/ag-talk

Stripe Rust Observed on Cheatgrass – Vigilance Advised for Wheat Fields

All Crops    Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Stripe Rust

Posted on: March 27, 2026 by Jemila Chellappa

» Strip_rust_on_cheat_1.jpg

Annual Survey

All Crops    Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Posted on: March 26, 2026 by Jemila Chellappa

We Didn’t Forget… We’re Getting Ready to Celebrate!
As we prepare to celebrate 25 years of the PNW Pest Alert Network, we want to hear from the people who made this journey possible — you!
Our Annual Survey is still open, and your feedback plays a critical role in shaping the future of pest alerts, GDD tools, and decision-support resources across Idaho and the Pacific Northwest.
Haven’t taken the survey yet? There’s still time!
Your input helps us:
Improve real-time pest alerts
Enhance GDD-based decision tools
Deliver more region-specific, actionable insights
Bonus!
Everyone who completes the survey will be entered into a Lucky Draw, and winners will be announced during our 25-Year Celebration on May 20th!
Don’t miss out:
✔ Share your feedback
✔ Enter the lucky draw
✔ Be part of our milestone celebration
Take the survey today!
*Crop Subscribers - https://uidaho.co1.qualtrics.com/jfe/form/SV_0BQQgjBpDHFSVNk
*Garden and Landscape Subscribers - https://uidaho.co1.qualtrics.com/jfe/form/SV_cUXPcTHHBz4qQsK
Thanks for your time taking the survey!

Early Pest Detections - Codling Moth & Peach Twig Borer

Apple    Treasure Valley, Treasure Valley - Idaho, Treasure Valley Oregon

Codling Moth & Peach Twig Borer

Posted on: March 24, 2026 by Jemila Chellappa

Pest Alert: Early Detection of Codling Moth & Peach Twig Borer
Location: Farmway & Karcher area, Treasure Valley, Idaho
Date: March 24, 2026
Backyard growers in the Farmway and Karcher area have reported early captures of key orchard pests in delta traps:
Codling moth (Cydia pomonella) – 1 adult captured
Peach twig borer (Anarsia lineatella) – 1 adult captured
These detections are earlier than typically expected, signaling that pest activity has begun in localized areas.
What This Means
This may represent early flight initiation (biofix approaching or beginning) for both pests.
Even low trap counts are important—they indicate the start of adult emergence.
Warmer early-season conditions may be accelerating development.
Recommended Actions for Growers
Deploy traps immediately if not already in place (especially in apples, pears, peaches, nectarines).
Check traps regularly (2–3 times per week) to monitor trends.
Record first consistent captures to establish a reliable biofix.
Begin tracking Growing Degree Days (GDD) for precise timing of:
Egg hatch (Codling moth)
Larval emergence (Peach twig borer)Why It Matters
Why It Matters
Accurate timing based on trap data + GDD allows for:
Improved spray timing
Reduced unnecessary pesticide applications
Better pest control and fruit protection
Stay Connected
Continue monitoring updates through the PNW Pest Alert Network for region-specific guidance and GDD-based recommendations.

Onion Growers Alert

All Crops    Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Cull Onion Disposal

Posted on: March 4, 2026 by Jemila Chellappa

Growers are reminded that the deadline to dispose of existing cull onion piles is March 15 to help prevent the buildup of onion pests such as onion maggot.
Key Requirements
All existing cull onion piles must be disposed of by March 15.
From March 15 to July 1, any new cull piles must be disposed of within one week of creation.
Proper disposal is essential to reduce pest development and protect nearby onion fields.
Management Options
If cull onions cannot be buried in a timely manner, piles may be treated with an approved insecticide labeled for cull piles or non-crop areas.
Approved options previously identified include:
Malathion products
Gowan Malathion 8 Flowable – EPA Reg. No. 10163-21
Malathion 5 EC – EPA Reg. No. 66330-220
(Malathion is generally the most economical option.)
Azadirachtin products
AzaGuard – EPA Reg. No. 70299-17
Ecozin Plus 1.2% ME – EPA Reg. No. 5481-559
Gowan Aza-Direct – EPA Reg. No. 71908-1-10163
Always read and follow pesticide label instructions before application.
Additional Regulations
In Malheur County, Oregon, no more than 80 tons of onion debris may be buried per acre.
State regulations related to onion maggot management and cull disposal can be found in the links below.
Additional Resources
Oregon rule: https://secure.sos.state.or.us/oard/viewSingleRule.action
Idaho rule (onion maggot section begins on page 8): https://adminrules.idaho.gov/rules/current/02/020605.pdf

» ODA Onion Maggot Cull Letter

» Pesticide Advisory Notice

» ISDA Cull Onion Brochure

2026 Miller Research Potato Pest Management Seminar

Potato    All Locations

Posted on: January 16, 2026 by Jeff Miller

The 2026 Miller Research Potato Pest Management Seminar will be Thursday, February 26 at the Historic Wilson Theater in Rupert. Cost is $30. ISDA and CCA credits have been requested. More details can be found on the attached page and link.

» https://millerresearch.com/event/2026-miller-research-potato-pest-management-seminar/

» 2026_Seminar_Announcement.pdf

Treasure Valley Onion School

All Crops    Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Posted on: December 19, 2025 by Jemila Chellappa

» Treasure_Valley_Onion_Workshop_Revised.pdf

2025 Idaho Association of Plant Protection - Nov. 5-6

All Crops    All Locations

Posted on: October 9, 2025 by Jeff Miller

The agenda for the 2025 Idaho Association of Plant Protection is attached. The cost to attend is $30 for standard registration and $20 for students. The fee is the same whether you attend one or both days. Payment can be made at the door and credit cards are accepted.
Attendees can earn 2 ISDA credits and 4 CCA Pest Management credits on Wednesday and 3 ISDA credits and 4 CCA Pest Management credits on Thursday.

» https://millerresearch.com/event/2025-idaho-association-of-plant-protection/

» IAPP_2025_Program.pdf

Pesticide Recertification Seminars

All Crops    Treasure Valley, Treasure Valley - Idaho, Treasure Valley Oregon

Posted on: October 6, 2025 by Jemila Chellappa

Upcoming Treasure Valley Cropping Systems Seminars: Pests and Pesticides
When: Monday, October 20 & Thursday, October 23, 2025
Where: 1904 E Chicago Street, Caldwell Research and Extension Centre, University of Idaho Extension, Caldwell, Idaho
Time: 10:00 AM – 12:00 PM both days
The Treasure Valley Cropping Systems Pests and Pesticide Seminars bring together Extension specialists and regulatory experts to provide the latest updates on insect pests and pesticide regulations for Idaho growers, applicators, and agricultural professionals. Each day features two focused, one-hour sessions followed by Q&A, offering practical, research-based information to strengthen IPM practices, improve decision-making, and ensure compliance.
Cost is free/ Registration required https://forms.office.com/r/B6wWQ6Q0x8?origin=lprLink
Pesticide Credits: 4 (2 for each day)
Monday, October 20, 2025 – Insect Pests of Treasure Valley Crops
10:00–11:00 AM – Insect Pests and Their Management in Treasure Valley Crops
Speaker: Dr. Armando Falcon-Brindis, University of Idaho Extension
→ Focus on key insect pests, thresholds, and integrated management strategies.
11:00 AM–12:00 PM – Classical and Emerging Horticulture Insects & Pathogens in Idaho
Speaker: Bradley Stokes, University of Idaho Extension
→ Highlights on invasive and established pests, safe pesticide use, and IPM in home and commercial horticulture.
Thursday, October 23, 2025 – Pesticides & Regulations
10:00–11:00 AM – Understanding Pesticide Chemistry: From Mode of Action to Resistance Management
Speaker: Dr. Marcelo Dimase, University of Idaho Extension
→ Learn how pesticide chemistry connects with field management and resistance prevention.
11:00 AM–12:00 PM – Navigating Pesticide Regulations and Compliance in Idaho
Speaker: Blaine Sterling, Idaho State Department of Agriculture (ISDA)
→ Review Idaho licensing, record-keeping, label interpretation, and compliance requirements.
Why Attend
Strengthen your IPM knowledge
Stay compliant with Idaho pesticide laws
Connect with Extension and ISDA experts
For more information or registration details, contact:
Jemila Chellappa, Ph.D.
Assistant Professor & Area Extension Educator – Cropping Systems
University of Idaho Extension, Southern Districts

» Oct 20 Seminar Flyer

» Oct 23 Seminar Flyer

Final potato psyllid monitoring update of 2025 season

Potato    All Locations

potato psyllid

Posted on: September 19, 2025 by Tasha Stanzak

This is the final report of the 2025 potato psyllid / Lso monitoring season.
Among the 11 psyllids captured last week, two tested positive for Lso, the bacterium associated with zebra chip disease (ZC).
Overall captures have been remarkably similar for the last three years. About 10% of all psyllids tested positive for Lso this year compared to about 4% last year and 6% the year before. The risk of ZC may have been slightly elevated this year by the prevalence of Los, but mitigated somewhat by relatively low psyllid captures. It is worth noting that nearly all of the Lso-positive psyllids were captured in the Magic Valley, with a few in the Treasure Valley, and none in the Upper Snake region.
Please remember that our research with Russet Burbank shows that ZC can develop during storage if infection occurs as late as two weeks before vine kill.
Thanks again to all of our cooperators who helped to deploy and retrieve so very many yellow sticky traps! And thanks to the growers who let us use their fields for this work!
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures decline overall, one new Lso-positive – 11 September 2025 update

Potato    All Locations

Posted on: September 11, 2025 by Tasha Stanzak

• This week we received traps from 21 fields that we are monitoring. Most fields have undergone vine kill and/or monitoring on them has otherwise ceased.
• We captured a total of 11 psyllids across 3 fields.
• Captures were from Canyon and Twin Falls counties.
• Among the 17 psyllids captured last week, one tested positive for Lso.
This is our last week reporting psyllid captures. Next week we will report on Lso incidence in psyllids captured this week. Psyllid captures from this week were relatively low overall. One of the psyllids from last week tested positive for Lso; this was the first Lso-positive psyllid since early August. Lso incidence this year has been relatively high, but thankfully the relatively low abundance of psyllids should mitigate risk of ZC somewhat. Nevertheless, we encourage you to maintain your IPM programs, especially in areas that have had higher captures of Lso-positive psyllids earlier this season. Next week we will post an end-of-season wrap up.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures still moderate, no new Lso – 4 September 2025 update

Potato    All Locations

potato psyllid

Posted on: September 4, 2025 by Erik Wenninger

• This week we received traps from 17 fields that we are monitoring. Many fields have undergone vine kill and/or monitoring on them has otherwise ceased.
• We captured a total of 17 psyllids across 6 fields.
• Captures were from Gooding, Jerome, and Twin Falls counties.
• Among the 43 psyllids captured last week, none tested positive for Lso.
Psyllid captures were on par with the low-to-moderate numbers that we saw during the past few years at this time. Thankfully all the psyllids from last week again tested negative for Lso; we haven’t had any Lso-positive psyllids since early August. This should have been the last week of reporting on psyllid captures, but the busy season delayed retrieval of traps from some fields, so we hope to have those numbers next week. In the meantime, we encourage you to maintain your IPM programs, especially in areas that have had higher captures of Lso-positive psyllids this season.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures tick up, no new Lso – 28 August 2025 update

Potato    All Locations

potato psyllid

Posted on: August 28, 2025 by Tasha Stanzak

• This week we received traps from 31 fields that we are monitoring.
• We captured a total of 43 psyllids across 14 fields.
• Captures were from Canyon, Gooding, and Twin Falls counties.
• Among the 14 psyllids captured last week, none tested positive for Lso.
Psyllid captures ticked up this week in both the Magic and Treasure valleys. This is not entirely surprising given that psyllid abundance very often spikes during August, though captures had been tracking much lower over the past several weeks. Thankfully all the psyllids from last week tested negative for Lso. Some fields have undergone vine kill and will no longer be monitored. Early harvest also limited person-power for trap retrieval from some sites, so those traps will be retrieved next week. We encourage you to maintain your IPM programs, especially in areas that have had higher captures of Lso-positive psyllids this season.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures still low, Lso still present – 21 August 2025 update

Potato    All Locations

potato psyllid

Posted on: August 21, 2025 by Tasha Stanzak

• This week we received traps from all 48 fields that we are monitoring.
• We captured a total of 14 psyllids across 8 fields.
• Captures were from Owyhee, Canyon, Gooding, Jerome, and Twin Falls counties.
• Among the 12 psyllids captured last week, 1 tested positive for Lso.
Psyllid captures this week remained quite low, and one more Lso-positive psyllid was captured last week. Overall captures this year have been low to modest with relatively high prevalence of Lso. Thankfully the low captures should help to mitigate the potential risk of ZC that may come with high prevalence of Lso. Interestingly, we still have yet to capture a potato psyllid in the Upper Snake region this year. Please maintain your IPM programs, especially in areas with higher captures of Lso-positive psyllids.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Psyllid captures lessen slightly, Lso is still present– 14 August 2025 update

Potato    All Locations

potato psyllid

Posted on: August 14, 2025 by Tasha Stanzak

• This week we received traps from all 48 fields that we are monitoring.
• We captured a total of 12 psyllids across 5 fields.
• Captures were from Payette, Canyon, Twin Falls, and Minidoka counties.
• Among the 24 psyllids captured last week, 2 tested positive for Lso.
Psyllid captures this week ticked down a bit from last week, and two more Lso-positive psyllids were captured last week. Overall captures this year have been modest with relatively high prevalence of Lso. Interestingly, we still have yet to capture a potato psyllid in the Upper Snake region this year. Please maintain your IPM programs, especially in areas with higher captures of Lso-positive psyllids.
More information on management of potato psyllids and ZC can be found here:
https://www.uidaho.edu/cals/potatoes/pest-management/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 from 2020 through 2025 and an archive of this year’s weekly updates as the season progresses: https://idahopestmonitoring.org/

» https://idahopestmonitoring.org/

Eastern Idaho Pest Alert

All Crops    Eastern Idaho

Posted on: August 13, 2025 by Jemila Chellappa

EASTERN IDAHO PEST ALERT
Serving Counties: Bannock, Bingham, Bonneville, Cassia, Fremont, Jefferson, Madison, Power, and Teton
Date: August 8, 2025 | Volume 6, Issue 13
Disease Spotlight: Fusarium Wilt
Cause: Soil-borne fungus Fusarium oxysporum
Crops Affected: Tomatoes, peppers, cucumbers, melons
Symptoms: Yellowing leaves, wilting, stunted growth, brown vascular tissue
Management: Resistant varieties, crop rotation, soil health, sanitation, biological controls, solarization, and avoiding overwatering.
Fall Tree & Shrub Planting Tips
Why Fall is Ideal: Cooler temps, more rain, and still-warm soil encourage root growth.
Key Practice: Root washing helps correct root deformities in container plants.
Tips: Dig wide (not deep), use native soil, water wisely, mulch properly, stake only if necessary.
Codling Moth Management
Timing: 2nd generation egg hatch in most areas has begun or passed. Continue protection through Sept. 15.
Spray Schedules: Vary by location and fruit damage history (see region-specific table on page 5).
Product Guidance:
Conventional options: Spectracide, Sevin, Malathion, Bonide, etc.
Organic options: Neem oil, Cyd-X, Spinosad, pyrethrin products.
Choose different products for each generation to prevent resistance.
Fireblight Control
When: Monitor symptoms ~2 weeks after full bloom; prune infected wood during dry weather.
Chemical Controls: Copper, lime sulfur, oxytetracycline, Actigard, etc.
Biological Controls: Include Streptomycin, Blossom Protect, Serenade Optimum, Regalia, and others.
Pruning Reminder: Always disinfect tools between cuts.
Upcoming Events
IDAHO HOME GARDEN TIPS:
Aug 12: Deer Proofing Your Yard – Sara Mahdavi @ 7 PM
Aug 19: Late Season Flowers – Andy West @ 7 PM
Aug 26: Dehydrating Your Harvest
Sept 9: Understanding Manures
Sept 23: Freeze Drying Your Harvest
PLANT TALK Q&A:
Ron Patterson & Reed Findlay – Aug 12 & Aug 19 @ 7:30 PM
Contact Info:
University of Idaho Extension – Bonneville County

» AUGUST 8, 2025| VOL. 6 ISS. 13

Position Announcement: Director, Foundation Seed and Parma Station

All Crops    All Locations

Foundation Seed Director

Posted on: August 12, 2025 by Juliet Marshall

We have a new position posted for the Foundation Seed Director and invite applicants to http://uidaho.peopleadmin.com/hr/postings/49200 for more information.

Title: Director, Foundation Seed and Parma Station
Department: Idaho Agricultural Experiment Station
Posting Number: SP004976P
Open until filled with a first consideration of 9/14.

» https://urldefense.com/v3/__https:/uidaho.peopleadmin.com/hr/shibboleth__;!!JYXjzlvb!nawX9EjbZ-Fdb81d3qsne_k7bA5n7m33rKZAg242sT7wRH1ip8hyPEjObujnqQCPgYS5LlbpAavdehyOZdTtaImN$

Reminder - Miller Research Potato Pest Management Field Day - August 20

Potato    All Locations

Posted on: August 12, 2025 by Jeff Miller

Come to the Miller Research Potato Pest Management Field Day on Wednesday, August 20. Registration begins at 8:30 with the field tour going from 9:00 AM to 12:00 PM.
Three ISDA pesticide recertification credits and three CCA IPM credits are available.
The cost to attend is $20 and lunch will be provided.

2025 marks our 50th anniversary! Come celebrate with us at the field day!

» https://millerresearch.com/event/2025-miller-research-potato-pest-management-field-day/

Reminder: Parma Field Day

All Crops    Treasure Valley, Treasure Valley - Idaho, Eastern Idaho, Magic Valley, Northern Idaho, Treasure Valley Oregon

Posted on: August 11, 2025 by Jemila Chellappa

2025 Field Day at Parma

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