Sprays starting at petal fall are needed for control of this disease. Botrytis Blight Botrytis infects primarily at bloom, killing the flowers. From the blooms it infects the rachis, girdling it and killing the cluster of fruit from that point outward. Fruit may also be infected during ripening. The disease progresses through the whole cluster.
White berries turn brown, and dark berries become reddish.
The fungus overwinters on hard black bodies, called sclerotia, on the canes or soil surface. Bloom sprays are essential for control of this disease. Pesticide Precautions Observe all directions, restrictions and precautions on pesticide labels. It is dangerous, wasteful and illegal to do otherwise. Store all pesticides in original containers with labels intact and behind locked doors.