Gummy Stem Blight/ Black Rot of Cucurbits

Closeup of pycnidia (asexual stage= Phoma cucurbitacearum) with prominent ostiole through which conidia are released.

Individual pycnidium surrounded by exuding conidia in the shape of a "spore horn"

Photos courtesy of T.A. Zitter, Cornell University, Ithaca, NY

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