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Gray mold on tomatoes

A common disease especially under humid conditions caused by the ubiquitous fungusBotrytis cinerea. It is able to infect many different plants and typically starts on dead tissue.

Cell pack of affected tomato seedlings.

gray mold on tomato

Stem canker (lesion) due to gray mold. (Next four images.)

Note the dead leaf attached to the stem in the center of the canker. The pathogen attacked the dead leaf first, then was able to move into the stem.

gray mold on tomato

gray mold on tomato

gray mold on tomato

gray mold on tomato

Close-ups showing sporulation. (Next two images.)

The gray fuzzy growth of the gray mold pathogen distinguishes this from other diseases, in particular late blight, and from secondary fungi that decompose dead tissue. A good hand lens or microscope is needed to see the growth in enough detail to confirm its identity.

gray mold on tomato

gray mold on tomato

More gray mold images

gray mold on tomato

gray mold on tomato

gray mold on tomato

gray mold on tomato

gray mold on tomato

gray mold on tomato

gray mold on tomato

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