Tag Archives: stripe rust

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 »

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 »

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 »

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 »

By Dr. Xianming Chen In the western Pacific Northwest (PNW), especially northwestern Washington, winter wheat ranged from kernel watery ripe (Feekes 10.54) to soft dough (Feekes 11.2) and spring wheat from stem extension (Feekes 7) to heading (Feekes 10.3). Stripe rust has been severe as normal. We completed the stripe rust data collection on winter crop nurseries and the first ... Read More »

By Dr. Xianming Chen This morning, I was checking fields in the Palouse region. Winter wheat was at boot to heading stages (Feekes 10-10.3). Stripe rust was found in all of our experimental winter wheat fields around Pullman, Wash. Rust appeared in small foci of mostly 5-10 stems, except one row entirely infected. Most foci had rust on leaves from bottom ... Read More »

By Dr. Xianming Chen Yesterday, we were checking wheat fields in Whitman, Garfield, Columbia, Walla Walla and Franklin counties in Washington and Umatilla County in Oregon. Winter wheat ranged from early jointing (Feekes 5) to heading (Feekes 10). Stripe rust was found in several locations. At Central Ferry in Garfield County, severe stripe rust was found on squirreltail (wild rye) ... Read More »

By Dr. Xianming Chen Last week, we were planting spring nurseries and recording the first set of stripe rust data in winter nurseries at Mount Vernon (Skagit Co.) in northwestern Washington. Winter wheat plants were at Feekes 5-7 and barley plants were at Feekes 6-7. Stripe rust reached 60-80 percent severity on susceptible wheat varieties and 20-40 percent severity on ... Read More »

By Dr. Xianming Chen On Wednesday, we were checking wheat fields in Whitman, Lincoln, Douglas, Grant, Adams, Franklin, Benton and Walla Walla counties of Washington. Winter wheat crops ranged from Feekes 3 to 6.  No rust was found in any commercial fields in these counties. Even in the field of Grant County in which stripe rust was found quite easily ... Read More »

by Dr. Xianming Chen This unusual winter appears over, and spring comes late but suddenly. Based on the forecast models, we predict that stripe rust will potentially cause yield loss of 16 percent on highly susceptible varieties. This level is much lower than the 38 percent forecasted in January due to the cold February. Based the current forecast, stripe rust will likely ... Read More »