How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Botrytis rot

Tissue infected with the gray mold fungus, Botrytis, is covered with a velvety gray growth when the fungus begins to produce spores. If the humidity is high, berries become cottony white with fungus mycelium. Decayed fruit remain fairly firm and contents do not leak. The velvety appearance of decayed tissue and the absence of liquid leaking from the fruit distinguish gray mold from other fruit rots such as Rhizopus.

Leaking of contents caused by Rhizopus
Leaking of contents caused by Rhizopus

Velvety appearance of gray mold
Velvety appearance of gray mold


Statewide IPM Program, Agriculture and Natural Resources, University of California
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