How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Bunch rot

Life cycleFollowing injury, berries are susceptible to invasion by many microorganisms that frequently enter through insect- or bird-feeding sites, mechanical cracks, or lesions. The Botrytis fungus that causes bunch rot survives in decaying plant material in or on the soil and as sclerotia. It usually infects only flowers and senescing or injured tissue, especially plant parts in contact with damp soil. However, green, healthy tissue may be affected. Grapes are infected at the flower stage, but the fungus remains dormant until fruit mature; bunch rot then develops if conditions become cool and damp.


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