| Anthracnose is a southern
disease that occurs in northern regions. Some table grape varieties
are particularly susceptible. Symptoms occur on all aboveground parts
of the vine, particularly on young tissues. Leaves develop numerous dark
brown spots, 1/25 to 1/5 inch (1 to 5 mm) in diameter. As the centers
fall out, lesions take on a “shot-hole” appearance. Severe infections
curl and distort leaves. Lesions on shoots are sunken and dark brown with
grayish centers.
Lesions on shoots are sunken and dark brown with grayish centers.On green berries, “bird’s-eye” spots are purplish brown or bleached with a dark edge. Berries remain firm, crack and shrivel. The fungus overwinters in infected parts of the vine, and spores are dispersed by wind and rain splash in the spring. Anthracnose can be severe in rainy years. |
