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2) Stripe rust (or Yellow Rust) in Wheat - Western
Idaho
All Crops
All Locations
Stripe rust on wheat
Posted on: June 5, 2020 by Juliet Marshall
Stripe rust has found its way to western Idaho, reported from at least two locations (with
accompanying picture), one location was on UI Magic CL+. (Thanks Oliver Neher!) The growth
stage of winter wheat in that area is past the window of fungicide application, and is currently
in grain fill. Spring wheat is still vulnerable and susceptible varieties should be scouted for the
appearance of stripe rust.
In the Magic Valley and into eastern Idaho, winter wheat is heading and susceptible varieties
are still vulnerable to significant yield loss associated with stripe rust infection. Stripe rust
reaction of last year’s varieties in the Extension Variety Trials is reported in the 2019 Small
Grains Report available online at https://www.uidaho.edu/extension/cereals/scseidaho. (The data
is included here as attachments.). Also keep an eye out for stripe rust on barley. No barley
stripe rust has been reported so far this year.
Please note that while some wheat varieties were reported as resistant in 2019, race changes
were reported in California by Dr. Mark Lundy (UC Davis pathologist) in this year’s crop;
therefore scouting of all varieties is recommended this season. Please report observations so
we can keep track of the in-season spread.
The weather forecast for this and especially next week is very conducive to stripe rust spread
and infection. Fungicide application recommendations developed through NCERA-184
pathologists, coordinated by Dr. Erick De Wolfe Kansas State University, is also attached.
≫ https://www.uidaho.edu/extension/cereals/scseidaho
≫ NCERA184 Wheat Fungicide table for 2020
≫ Winter Wheat Reaction to Stripe rust in 2019
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