The typical symptom of Botrytis infection of cucumber fruits in a greenhouse appears as an invasive gray rot of the fruit. In the spring, the fungus germinates from small, dark-colored, hard over-seasoning structures known as sclerotia. The fungus then produces asexual spores (conidia) that spread the disease. These spores are produced throughout the growing season. Symptoms develop readily under warm about 18-25°C, and prevailing moist conditions. Botrytis cinerea has a worldwide distribution and is ubiquitous in greenhouses. It is one of the most common diseases of greenhouse crops.

APS publication number:  IW000077

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