Grape Anthracnose Anthracnose may cause extensive losses in poorly kept Georgia vineyards, but it can be controlled economically. It spreads to all new growth during wet periods in early spring. The appearance of anthracnose on fruit, stems and leaves is not readily confused with black rot and other diseases. Stem lesions are similar in color, sunken, with slightly raised borders. Severely infected leaves become distorted and curl down from the margins.
Individual spots are gray with a dark border.
Later, the center of the lesion drops out, giving a ragged effect. Downy Mildew Plasmopara viticola , the cause of downy mildew, attacks all green parts of the vine. Initially, lesions are yellowish and oily, and become angular, yellow to reddish brown spots. Infected shoots thicken and curl, then turn brown and die. Young berries become gray when infected.