Tag Archives: stripe rust

By Xianming Chen As July 12, we have almost completed recording stripe rust data in our winter and spring crop nurseries at various locations in Washington. Stripe rust developed to 100% severity on susceptible winter wheat varieties in all nurseries and up to 80% severities on spring wheat nurseries in Lind, Walla Walla, and Central Ferry and to 100% on susceptible ... Read More »

By Xianming Chen Stripe rust in the Palouse region On May 30, I was checking wheat and barley fields in the Palouse region (Whitman County, Wash., and Latah County, Idaho). Winter wheat ranged from boot (Feekes 10) and heading (Feekes 10.5), and winter barley reached the flowering stage (Feekes 10.52). Spring wheat and barley ranged from early tillering (Feekes 2) ... Read More »

By Xianming Chen USDA Research Plant Pathologist On April 24, when we were planting spring wheat nurseries at the Palouse Conservation Farm Station near Pullman in Whitman County, I was checking our winter wheat nurseries. Plants had reached middle jointing stage (Feekes 6), and stripe rust was more widespread than the last report, with almost all susceptible check rows having ... Read More »

By Xianming Chen USDA Research Plant Pathologist Over the last 10 days, we were planting spring cereal nurseries and checking winter wheat fields in various locations. So far, we have found stripe rust in our disease monitoring and germplasm screening fields in all locations we have checked. On April 2, we were planting spring wheat and barley at Walla Walla. ... Read More »

By Dr. Xianming Chen Wheat stripe rust is forecasted to be in the range of severe epidemic (40-60% yield loss) in the 2024 growing season for the eastern Pacific Northwest, based on the predication models using the weather data from November 2023 to February 2024. The models predicted highly susceptible varieties to have 51% yield loss with a standard deviation of 6%. ... Read More »

By Xianming Chen Research Plant Pathologist, USDA-ARS Based on the weather data of November and December 2023, stripe rust in the 2024 wheat growing season is predicted to be in the range of severe epidemic level (40-60% yield loss on susceptible varieties). Using different forecast models based on the 2023 November and December weather data, yield loss of highly susceptible ... Read More »

By Xianming Chen Last week, we completed collecting the stripe rust data in our germplasm screening nurseries of winter crops and took the first time of stripe rust data of the spring crop nurseries at Mount Vernon in northwestern Washington (Skagit County). As always for this location under natural infection, wheat stripe rust was severe, up to 100% severity on ... Read More »

By Dr. Xianming Chen On May 16, we were checking winter wheat fields in Whitman, Garfield, Columbia, Walla Walla, Franklin and Adams counties in Washington. Winter wheat ranging from early jointing (Feekes 5) to early flowering (Feekes 10.51). Stripe rust was not found in any of the checked commercial fields and not found in our stripe rust experimental plots in Central Ferry (Garfield County) and ... Read More »

By Dr. Xianming Chen On April 26 and 27, we were planting spring cereal nurseries and taking the first notes of the winter nurseries at Mount Vernon, Wash. The winter plants were at middle jointing stage (Feekes 6 on average). Wheat stripe rust was up to 80% severity on susceptible varieties. Barley stripe rust was up to 40% severity. The ... Read More »

By Xianming Chen  Wheat stripe rust is forecasted to be in the moderate epidemic level range (20-40% yield loss) in the 2023 growing season, based on the predication models using the weather data from November 2022 to February 2023. The models predicted highly susceptible varieties to have 37% yield loss with a standard deviation of 16%. This value is higher ... Read More »