When conditions are dry, infected leaf tissues quickly dry up, and the white mold growth disappears. Infected areas on stems appear brown to black, and entire vines may be killed in a short time when moist conditions persist. On fruit, symptoms appear as coppery-brown discolored areas, often beginning at the calyx end. The fruit may remain firm as the lesions progress. Under moist conditions, a white, fluffy mold may appear.
Symptoms appear on both red and green fruit.
Fields should be scouted regularly for disease symptoms, especially during periods of cool, wet weather.