My grapes have black rot.
What should I do?

Grape black rot is a fungal disease which can be treated with fungicides. You need to start spraying at bloom. Retired UT Extension Agent Mike Dennison says Mancozeb and Myclobutanil are effective. Read and follow the label directions on any chemicals you use.
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Related Videos:
Grapes and Muscadines
Mixing and Applying Fungicide

Related Resources:
Black Rot on Grapes in Home Gardens
Early-Season Disease Management