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Two isolates ofColletotrichum gloeosporioides(teleomorph:Glomerella cingulata) with different host specificities (one isolate from the leguminous weed northern jointvetch and the other from pecan) that mate on agar media were tested for their ability to cross on northern jointvetch (Aeschynomene virginica). Stems of living northern jointvetch plants were inoculated with one of the isolates and, after...