05-29-17 CSU Ext ALERT: Wheat Disease Update – Kirk Broders, Plant Pathologist…

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Allmer Wheat Fields Sec 34 053116

Photo courtesy of The BARN – May 31, 2016

Wheat Disease Update – May 29, 2017

Kirk Broders, Plant Pathologist; Department of Bioagricultural Sciences and Pest Management, Colorado State University

Written by: Kirk Broders, Plant Pathologist; Department of Bioagricultural Sciences and Pest Management, Colorado State University; C030 Plant Science Bldg., 1177 Campus Delivery, Fort Collins, CO, 80523-1177; 970-491-0850 (work);  kirk.broders@colostate.edu 

Thanks to several spring rain and snow storms the entire eastern half of Colorado is now drought free (http://droughtmonitor.unl.edu)!  However, with all that moisture comes several foliar pathogens of wheat that are not frequently observed in the state. I visited the CSU variety trial locations near Julesberg, Haxtun, Yuma, Akron and Orchard last week and I notice significant amounts of tan sport (Figure 1), and also found Stagonospora leaf blotch in some areas and the early symptoms of Stagonospora glume blotch (SLB & SGB) (Fig. 2). Stripe rust was also present in these locations, but the disease incidence (% of plants in a field infected) was relatively low. However, I did see my first stripe rust infections on the flag leaf (Fig. 3). Continue reading