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Sclerotinia white mold on pumpkin/gourd

White mold or Sclerotinia rot is characterized by white cottony fungal growth often containing hard, black structures resembling small raisins (sclerotia). Infection usually occurs where fruit they are in contact with soil. It could be confused with Phytophthora fruit rot (see photo) or Pythium fruit rot (see photo); however, sclerotia only occur with white mold. Stems can also be affected by white mold.

Photo courtesy of M.T. McGrath, Long Island Horticultural Research and Extension Center