Tag Archives: stripe rust

Stripe rust report 07/16: In general, stripe rust under control and season over

By Dr. Xianming Chen Winter wheat has reached maturity, and harvest has started in central and southcentral Washington. In the Palouse region in Eastern Washington and northern Idaho, winter wheat ranged from milk to soft dough stages, and spring wheat ranged from flowering to milk. Stripe rust has reached 100 percent severity on susceptible varieties of spring wheat in our ... Read More »

Stripe rust update 07/01: Spring wheat, barley still susceptible

By Dr. Xianming Chen During the last two weeks, we have been recording stripe rust data in our experimental nurseries at various locations and completed note-taking of winter nurseries at all locations. Stripe rust reached 90 to 100 percent severity on susceptible winter wheat varieties at all locations. Barley stripe rust developed up to 80 percent severity at Mount Vernon ... Read More »

Stripe rust update 06/04: Weather conditions conducive to disease development

Dr. Xianming Chen This week, we were completing stripe rust notes of winter cereal nurseries in Mount Vernon (Skagit County), Wash.; Hermiston (Umatilla County), Ore.; and Walla Walla (Walla Walla County), Wash. Winter wheat and barley ranged from flowering to soft dough stage. Wheat stripe rust developed to 100 percent severity on susceptible winter varieties in these locations. Barley stripe ... Read More »

Stripe rust update 05/15: Stripe rust found in Lind experimental plots

By Dr. Xianming Chen This week, we were eventually able to travel to Mount Vernon (Skagit County) in northwest Washington to finish the first note-taking of stripe rust in winter nurseries and planting spring nurseries. The activities were about two to three weeks later than usual. Winter wheat ranged from late jointing (Feekes 9) to headed (Feekes 10.5) and winter ... Read More »

Stripe rust report 05/05: Stripe rust appears in the Palouse region

From Dr. Xianming Chen Today, I was checking stripe rust in our winter wheat experimental fields around Pullman (Whitman County in Washington), and found stripe rust on susceptible check varieties in two of the three locations. This is the first observation of stripe rust of this season in the Palouse region. The same fields were checked on April 22 and ... Read More »

Stripe rust update 04/22: Incidence low, but caution needed

By Dr. Xianming Chen Tuesday, I was checking wheat fields in Whitman, Adams, Lincoln, Grant and Douglas counties in Washington. Winter wheat ranged from Feekes 4 to 7. Minor frost damage on leaf tips was common in Whitman County, caused by freezing night temperatures of the last week. Stripe rust was found only in one commercial field in Lincoln County. ... Read More »

Stripe rust forecast to be in the severe epidemic level in eastern PNW

By Dr. Xianming Chen Based on the predication models using the weather data from Nov. 1, 2019, to Feb. 29, 2020, wheat stripe rust is forecasted to be in the severe epidemic level range (40-60 percent yield loss) in the 2020 growing season. The models predicted highly susceptible varieties to have 44 percent to 53 percent with an average of 48% ... Read More »

Early 2020 stripe rust forecast predicts severe levels

From Dr. Xianming Chen Based on the weather conditions in November and December 2019, stripe rust in the 2020 wheat growing season is forecasted to be in the severe epidemic level range (40-60 percent yield loss). Using forecast models based on the 2019 November and December weather data, yield loss of highly susceptible winter wheat varieties in the 2020 crop ... Read More »

Stripe rust observed in wheat fields in Lincoln, Douglas counties

By Dr. Xianming Chen Tuesday, we were checking wheat fields in Whitman, Adams, Lincoln, Grant and Douglas counties in Washington. Winter wheat ranged from emerging (before Feekes 1) to early jointing (Feekes 5). Among more than 30 fields with wheat plants in the growth range of Feekes 3 to 5, stripe rust was observed in three fields, one in Lincoln ... Read More »

Stripe rust update 0712: Stripe rust season basically over with only very low levels found

By Dr. Xianming Chen During our field survey on July 9 in Whitman, Garfield, Columbia, Walla Walla and Astotin counties of Washington and Nez Perce and Latah counties of Idaho, winter wheat ranged from milk to mature. Stripe rust was found on green plants in some winter wheat fields, but at very low levels. Spring wheat ranged from heading to ... Read More »