Dark brown to black lesions developed on leaves, petioles, and stems of Russet Burbank potato after wounding by sandblasting and inoculating with either conidia or sclerotia of Colletotrichum coccodes in the greenhouse and with conidia in the field. Conidia from 10 isolates and four collections of sclerotia of C. coccodes from various areas of Washington and Idaho were pathogenic on potato foliage. Significantly (P<0.01) more lesions developed on foliage that was wounded than on foliage that was not wounded just before inoculation (.)
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Dennis A. Johnson (1993) studied this question.