Tolerance to Dodine in Venturia inaequalis

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Abstract
Monoconidial isolates of V. inaequalis from Michigan [USA] were about half as tolerant to dodine as the least-sensitive New York isolate as determined by zone inhibition, germination in water solutions and growth inhibition in broth. The most tolerant isolate crossed with normal isolates produced tetratype asci having 4 levels of tolerance suggesting additive action of at least 2 major independent genes for dodine tolerance. Testing of progeny from crosses of a green color mutant with isolates representing intermediate and high levels of tolerance indicated no close linkage between the genes for dodine tolerance and the green color gene of a known V. inaequalis linkage group. Inoculation experiments showed that isolate tolerance was a factor in scab control on [apple] trees treated with dodine at 4 .mu.g/ml but not at 10 .mu.g/ml. An ascospore abortion factor arising from the most tolerant isolates was not caused by the genes that conditioned higher levels of tolerance to dodine.

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