Abstract
In selfing studies with four cultures of race 11 and one of race 10 of wheat stem rust (Puccinia graminis Pers. f. sp. tritici Erikss. and Henn.) segregation ratios indicated that a single dominant gene governs virulence on the varieties Arnautka and Mindum and single recessive genes govern virulence on the varieties Marquis-Sr8, Marquis-Sr9a, and Marquis-Sr11. Virulence on Marquis-Sr9b appeared to be recessive but the observed ratio was a poor fit to a single factor ratio.