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Photo by Mary Burrows, Montana State University, Bugwood.org
Black stem rust (Ug99) Puccinia graminis f.sp. tritici (Ug99) is a serious disease of wheat and barley. While wheat in the United States is resistant to most strains of black stem rust, it is not resistant to this strain which has shown up in eastern Africa and the Middle East. Black stem rust (Ug99) can cause 80-90% grain loss in infected crops.
The Wyoming Black Stem Rust (Ug99) Survey is conducted by the Wyoming Pest Detection
/CAPS Program. Wheat and barley fields are visually surveyed throughout the growing
season. Any suspect material found is sent to the University of Wyoming for further
identification. Some fields are selected for a more intensive sampling effort, where
twenty plants are randomly selected from each field for further examination at the
University of Wyoming.