Bruce Bordelon, Small Fruit Extension Specialist, Horticulture and Landscape Architecture
For information about this fungal disease and its management, please refer to BP-36, Black Rot of Grapes and ID-146, Managing Pests in Home Fruit Plantings (PDF 850K).
As soon as grapes reach veraison, or start to change color, they become resistant to black rot.
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Plant and Pest Digital Library Project, Purdue University, West Lafayette, Indiana.