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Stripe Rust Alert (Wheat) and Spot Form of Net Blotch (Barle

Small Grains     
Ada county, Idaho
May 27, 2015 by Juliet Marshall

Spring and Winter Wheat

1) Stripe rust

Stripe rust is being reported from a widespread area, including northern Utah, western Idaho, southern Idaho (Twin Falls and Burley / Rupert area) and now eastern Idaho (Newdale and Blackfoot).

All reports so far have been in Brundage soft white winter wheat.

Brundage is very susceptible. If you have not be applying fungicides to this variety up to now, I would consider it infected and treat with a triazole fungicide which has some curative activity.

Strobilurin products may have reduced efficacy on stripe rust if the plants are already infected.

The Pre-Harvest Interval (PHI) has been reached in some winter wheat production at which time it is too late to apply fungicides. Always follow label directions.

Spray appropriate fungicides on susceptible spring wheat varieties at herbicide application.

2) BYD
Barley yellow dwarf symptoms are re-occurring in infected fields. Expect to see flag leaves with the typical yellow and red “flags”. For more information, see and click on publications to download the BYD bulletin published by the UI. The heavy rains have really helped to mitigate the damage.

3) RWA
Russian Wheat Aphids are damaging wheat in several areas - look for white (bleached) stripes on tightly curled leaves, and trapped heads which appear similar to frost damaged heads. We are seeing frost damage (which is the likely cause in the picture below) and RWA damage in wheat. RWA will colonize both wheat and barley.

Winter and Spring barley
1) BYD problems may resurface as plants begin to head. Expect to see flag leaves with the typical yellow and red “flags”. For more information, see and click on publications to download the BYD bulletin published by the UI. The heavy rains have really helped to mitigate the damage from the virus.

2) SFNB = Spot Form of Net Blotch is showing in barley fields, especially if the field has second year crops or has infected residue from the previous year. The disease can also survive on grassy weeds and volunteer barley, and be spread by infected seed. Use full strength fungicides for control when spraying herbicides for weed control.

Click on the link(s) below for more information about this pest:

More information...

2015 Potato psyllid monitoring program underway

May 22, 2015 by Erik Wenninger

The University of Idaho, in collaboration with Miller Research and several crop consultants across the state is continuing our monitoring program for potato psyllids, zebra chip, and liberibacter (Lso), the bacterium that causes zebra chip.

Monitoring on 17 of our “Light” sites began last week (all in the Treasure Valley) and 4 of our “Intense” sites (all in the Magic Valley) with the deployment of sticky cards. We found no potato psyllids on cards at any of these sites this week. Deployment of sticky cards began on many more sites this week as well. We expect to have a total of around 75 “Light” sites and 13 “Intense” sites across the state; this is similar to last year.

Online spreadsheets showing details of the psyllid captures in potato fields will go live next week.

We have been monitoring for psyllids within presumed overwintering habitat, including bittersweet nightshade and field bindweed sites, and we found 8 adult potato psyllids and many nymphs on bittersweet nightshade this week in Twin Falls County (no psyllids were found in Treasure Valley sites this week). These psyllids are now in transit to Moscow to be tested for Lso.

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

Click on the link(s) below for more information about this pest:

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Weed management in potatoes

May 21, 2015 by Pam Hutchinson

I’ve had many calls about weed control in potatoes because of high rainfall amounts, excessive soil moisture this spring.
Please see the attached WORD document for my thoughts on what may happen - what are the possibilities for weed control in potatoes due to these conditions.

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Western Cherry Fruit Fly Treatment Forecast

Tree Fruits     Treasure Valley - All
Ada county, Idaho
May 21, 2015 by Paul Castrovillo

According to the degree-day model from the Online Phenology and Degree-Day Models published at the OSU Integrated Plant Protection Center Website the forecasted dates for beginning treatment against Western Cherry Fruit Fly are: Ontario (May 25), Caldwell (May 29), Boise and Parma (June 4), Nampa (June 5) and Emmett (June 9). These are based on recommended first treatment at 1060 degree-days per "Orchard Pest Management" as published by the "Good Fruit Grower", Yakima 1993.

The first Idaho Western Cherry Fruit Fly for 2015 was recently found in a trap in Homedale on May 19.

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Iris yellow spot in volunteer onions

Onion     Treasure Valley - All
May 21, 2015 by Stuart Reitz

Several volunteer onions with Iris yellow spot virus (IYSV) have been found this week in Malheur County. Volunteer onions can serve as a source virus-infected thrips to move into this season's onion crop. Although the virus has not yet been found in this season's bulb fields, please continue to monitor fields carefully.

If you see potentially symptomatic plants that you would like tested for virus or have questions about thrips and the virus, please contact Stuart Reitz, Malheur County Extension, 541-881-1417.

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Coddling Moth Timing

Tree Fruits     
May 19, 2015 by Tony McCammon

Wilbur Ellis Spray Scheduling for this week:
Fruitland/Payette May 24th 350 DD
Parma/ Roswell May 23rd 350 DD
SunnySlope May 23rd 350 DD

Magic Valley May 25 350 DD
Pocatello May 30 350 DD
Rexburg June15 350 DD

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Onion Bulb Mites

Onion     Treasure Valley - All
May 15, 2015 by Stuart Reitz

Onion bulb mites have been found in several onion fields across the Treasure Valley. So far numbers appear to be low but they may be a contributing factor to stand losses.

Bulb mites can overwinter in the soil on decomposing vegetation or on volunteer onions in the field and in cull piles. Mild winter weather may have reduced their natural overwinter mortality.

Management relies on preventative measures, such as field sanitation and fumigation of fields with a history of problems.

If you have questions or concerns about onion bulb mites, please contact Stuart Reitz, Malheur County Extension, 541-881-1417,

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What is the Pacific Northwest Pest Alert Network?

This website utilizes a network of growers around the Pacific Northwest. As information about pest infestations becomes available, registered users will receive updates pertaining to the specific crops that they may be growing at the time.