Races ofPuccinia graminisin the United States and Mexico During 1982

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Abstract
Stem rust of oats and wheat were generally present in trace amounts in 1982. Oat stem rust was retarded by poor conditions for infection during the early part of the growing season in the principal oat-production area in the north central USA. Wheat stem rust was further restricted by the wide use of resistant cultivars in Mexico and the entire Great Plains of the USA. The principal race of oat stem rust in Mexico and the USA was NA-27, virulent on host genes Pg-1, -2, -3, -4 and -8. The 15-TNM was the principal wheat stem rust race in the USA host (virulent on Sr5, 7b, 8, 9d, 9e, 10, 11, 16, 17, 36 and Tmp). In Mexico, races 113-RKQ (virulenton Sr5, 6, 7b, 8, 9a, 9b, 9d, 15, 16, 17 and 36) and 151-QFB (virulent on Sr5, 8, 9a, 9d, 15, 16, and 17) were most frequent. No virulence was found in oat stem rust for host genes Pg-9, -13, -16 and -a or in wheat stem rust for Sr13, 22, 24, 25, 26, 27, 29, 31, 32, 33, 37, Gt and Wld-1.

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