Races of Puccinia graminis f. sp. tritici in the United States in 1979. A. P. Roelfs, Research Plant Pathologist, Cereal Rust Laboratory, AR, SEA, USDA, University of Minnesota, St. Paul 55108. D. H. Casper, Research Technician, and D. L. Long, Plant Pathologist, Cereal Rust Laboratory, AR, SEA, USDA, University of Minnesota, St. Paul 55108. Plant Dis. 65:138-140. . This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1981. DOI: 10.1094/PD-65-138.

Wheat stem rust was not severe in 1979. Little rust overwintered in the southern states. Spring generally provided marginal conditions for disease development in the winter wheat area. Lack of exogenous inoculum and the use of resistant cultivars prevented disease development in the spring and durum wheat area. Race 15-TNM comprised 38% of 419 isolates obtained from 169 rust collections; 151-QFB, 19%; 151-QSH, 9%; 15-TDM, 6%; 113-RKQ, 6%; 15-TLM, 4%; 56-MBC, 4%; 11-RCR, 3%; and 151-QCB, 113-RTQ, 17-HNL, 17-HDL, and 29-HJC, 2% each. Wheat lines with genes Sr13, 22, 24, 25, 26, 27, 29, 30, Gt, Tt-2, and Wld-1 and the cultivars Era, Olaf, Cando, and Ward were resistant to all cultures obtained.