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.
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Gray
spores on lettuce infected with Botrytis
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