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White Mold or Sclerotinia Rot

Figure 13. 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 Fig. 11) or Pythium fruit rot (see Fig. 12); 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

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Link to the Factsheet on Phytophthora Blight of Cucurbits

Link to Photo Gallery of Phytophthora Blight of Cucurbits