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Sclerotinia white mold on winter squash fruit

Sclerotinia white mold caused by Sclerotinia sclerotiorum can develop in the field on melons and pumpkins or in storage on winter squash. White cottony mold and the presence of black, pea-sized resting bodies (sclerotia) are important signs of the fungus.
Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY