Not a systematic work in the strict sense, but one with which those concerned with Colletotrichum taxonomy should be aware because of its scale and contribution to our understanding of the extent of host specificity amongst C. gloeosporioides isolates. 217 isolates obtained from yams and some other hosts conforming to the morphospecies C. gloeosporioides were tested for virulence against a set of Dioscorea alata cultivars. This enabled a remarkable 18 pathotypes to be distinguished, most causing moderate symptoms or not being virulent to yams.
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