Abstract
The ability of a number of weakly virulent isolates of Gaeumannomyces graminis (Sacc.) Arx & Olivier var. tritici Walker to protect wheat seedlings exposed to a virulent isolate of the pathogen was examined. Suppressive ability differed amongst isolates which were equally hypovirulent, judged by their pathogenicity on wheat seedlings, but was inversely related to their rate of ectotrophic growth on roots. Differences between isolates in growth rate on agar, pigmentation and type of interaction in culture were observed. However, no consistent association between any of these characters and suppressive ability was detected. Induced host resistance may be involved in the interaction, and hypovirulent isolates may vary in their capacity to elicit this.
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