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Grape IPM in the Northeast

Trace Bloom (5 percent Bloom)

IPM practice to be implemented

Monitoring required

Inoculum available for infection


Inoculum available

Botrytis is a fungus that causes a bunch rot of clusters and a blight of blossoms, leaves, and shoots. The bunch rot phase of the disease can cause severe economic losses, particularly on tight-clustered French hybrid and Vitis vinifera cultivars. Botrytis can colonize dead floral parts within clusters and infect the berries, rachises, or pedicels. A bloom fungicide application is generally not necessary in most years. If the bloom period is warm (average day and night temperatures >60°F) and wet, a fungicide application for Botrytis may be warranted.