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Animal and Plant Health Inspection Service
U.S. Department of Agriculture
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Black Stem Rust Photo Gallery

Black or wheat stem rust is a serious fungal disease of wheat and barley caused by Puccinia graminis f. sp. Tritici. Crops infected with black stem rust (BSR) suffer severe yield losses. The disease can be identified by the presence of rust-colored or black fungal spore masses on the stems and leaves of wheat and barley host plants.


Image (click on image to enlarge) Image Description and Photo Credit
stem rust image

Early stages of stem rust symptoms on wheat with rusty brown fungal fruiting bodies (uredia).  Photo by: Cereal Disease Laboratory, St. Paul, MN

Late stages of stem rust on wheat with black spore clusters (teliospores). Photo by: T. Murray, Washington State University, Pullman, WA

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Rust spores (yellow urediniospores) can contaminate shoes and clothing. Photo by: Department of Agriculture and Fisheries, Western Australia


Common barberry growing close to wheat fields. Photo by: T. Murray, Washington State University, Pullman, WA

Close-up of barberry bush with berries. Photo by: T. Murray, Washington State University, Pullman, WA

Yellowish-colored aeciospores produced on leaves of common barberry can infect wheat and barley.  Photo by: USDA-ARS, Cereal Disease Laboratory, St. Paul, MN

Rust-resistant ornamental barberry in a commercial nursery. Photo by:  A. Tschanz, USDA-APHIS-PPQ, Riverdale, MD

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