Grow recommended cultivars. Select site, orient rows and prune to promote air circulation and keep leaves dry. Immediately remove and dispose of any diseased plants or plant parts. Destroy all nearby wild or untended grapevines. They can harbor diseases.
Black rot is the major disease problem Ohio gardeners face in growing grapes.
Collect and dispose of all clusters of black and dried, or mummified fruit. Black rot causes this drying of fruit. Treat with appropriate fungicides as outlined in Bulletin 780. Harvest several times to prevent the feeding by bees and wasps on overripe fruit. Frequent harvesting also decreases infection by diseases.