Virulence of North American and European Races of Puccinia striiformis on North American, World, and European Differential Wheat Cultivars. C. De Vallavieille-pope, Agricultural Research Service, U.S. Department of Agriculture, Washington State University, Pullman 99167-6430. R. F. Line, Agricultural Research Service, U.S. Department of Agriculture, Washington State University, Pullman 99167-6430. Plant Dis. 74:739-743. Accepted for publication 5 March 1990. Copyright 1990 The American Phytopathological Society. DOI: 10.1094/PD-74-0739.

Cultures of North American and European races of Puccinia striiformis were compared on North American (NA) and world/European (W/E) wheat (Triticum aestivum) differential cultivars. Races virulent on cultivar Fielder were virulent on cultivar Heines Kolben (resistance gene Yr6), and those virulent on Fielder and Heines VII were virulent on Heines Peko (Yr2 + Yr6). Cultivars Strubes Dickkopf and Nord Desprez (Yr3a + Yr4a) provided additional differentiation of the North American races, and cultivar Stephens provided additional differentiation of the European races. Races virulent on Stephens and Druchamp were virulent on Nord Desprez, but some races virulent on Nord Desprez were avirulent on Druchamp and/or Stephens. Virulences differentiated on cultivars Yamhill, Tyee, Lemhi, and Produra were not differentiated using the W/E differentials.

Keyword(s): stripe rust, yellow rust.