How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Botrytis rot

Symptoms of Botrytis crown rot are similar to Sclerotinia rot: lower leaves of plants infected with Botrytis yellow, and eventually the whole head wilts and rots. A watery, brown decay develops on the underside of the head at the crown. A dense gray or light brown sporulation appears over the damaged areas when moisture is abundant; this gray sporulation distinguishes Botrytis from lettuce drop. Occasionally, the fungus produces small, black, usually flattened sclerotia on the plant's underside.

Gray spores on lettuce infected with Botrytis
Gray spores on lettuce infected with Botrytis


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