Abstract
The occurrence in Brazil of physiologic races of loose smut, Ustilago tritici, (Pers.) Rostr., has been demonstrated. Twelve races were identified amongst 50 field collections of loose smut. Five of the races were classified as being similar to Canadian race T 2, and two races as T 8 when the standard set of differential cultivars was used. However, further differentiation of these races was possible on three supplemental differentials. Another four races were virulent on several differential cultivars of common wheat and on Pentad, a differential cultivar of durum wheat, and thus appear to invalidate the claim that formae speciales of Ustilago tritici exist on common wheat and on durum wheat.
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