Abstract
Cultivars of hexaploid and tetraploid wheat were inoculated as seedlings with isolates of Cercosporella herpotrichoides Fron in six experiments. Cultivars differed in resistance, and isolates in pathogenicity. Within experiments there were statistically significant interactions between cultivars and isolates which could not be removed by rescaling, even when only the rank order of cultivars was considered. However, the differential responses of cultivars to isolates were not consistent from one experiment to another, and did not fall into a pattern that suggested physiologic specialization. In contrast to the known capacity of C. herpotrichoides for pathogenic adaptation to different host genera, no evidence has been found of physiologic races consistently adapted to different wheat cultivars.
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