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United States Department of Agriculture

Agricultural Research Service

Title: First Report of Colletotrichum Coccodes on Soybean in United States

item Hartman, Glen

Submitted to: Plant Disease
Publication Type: Research Notes
Publication Acceptance Date: July 21, 1998
Publication Date: N/A

Technical Abstract: Anthracose symptoms were observed on soybean (Glycine max (L.) Merr.) cv. Yale in Illinois in September, 1996. The lower stems were girdled by lesions that contained black fungal stroma. Colletotrichum coccodes (Wallr.) Hughes was isolated from surface sterilized portions of diseased stems incubated on potato dextrose agar (PDA). Cultures produced abundant black sclerotia and acervuli with setae. Acervuli produced straight and fusiform conidia (15-23 x 3-4 um) in honey-colored masses. Ovate or long clavate appressoria were formed on slide microcultures. Plants inoculated with the fungus senesced prematurely. C. coccodes was consistently reisolated from infected stems, leaves, petioles, and pod peduncles. Seeds collected from inoculated plants had some infected seeds. This is the first report of the presence of the pathogen on soybean in the United States.

Last Modified: 4/22/2015
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