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Disease Note Barley Stripe Rust in Texas. A. P. Roelfs, USDA-ARS, Cereal Rust Laboratory, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108. J. Huerta-Espino, and D. Marshall. USDA-ARS, Cereal Rust Laboratory, Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108, and Texas A&M University, 17360 Coit Road, Dallas 75252. Plant Dis. 76:538. Accepted for publication 18 November 1991. Copyright 1992 The American Phytopathological Society. DOI: 10.1094/PD-76-0538C. On 18 April 1991, a severe case of stripe rust was found on barley (Hordeum vulgare L.) in an irrigated nursery at Uvalde, Texas. Stripe rust, caused by Puccinia striiformis Westend., has occurred on wheat in Texas, but no wheat cultivars in the nursery were infected, although many are susceptible to the pathogen. Urediniospores from the infected barley were tested on wheat and barley stripe rust differential sets. Isolates were avirulent on the wheat set, including cvs. Michigan Amber and Lemhi, but virulent to cvs. Fong Tien, Larker, Morex, Robust, Steptoe, and Topper in the barley set and avirulent to BBA 809, Bigo, Emir, Hiproly, 15, Mazurka, Sakigake, and Varunda; responses in cvs. Astrix and Cambrinus were intermediate. This pathogen probably spread from Mexico, where stripe rust has been severe on barley in recent years. It may be similar to the barley stripe rust pathogen introduced into South America in 1975 that later spread across most of that continent (1). To become important in the United States, the pathogen would need a winter host (fall-seeded barley) and a late summer and fall host, perhaps volunteer barley and/ or the wild Hordeum species. |