Symptoms Leaf spot can be found on petioles, leaves, shoots and fruits. Leaf spots first appear as small purple dots on the leaves nearest the ground. They grow to circular spots becoming purplish black or brown. A small black pimple appears in the center of the spot. When the leaf is wet, a gelatinous mass of spores ooze from the pimple and give the spot a creamy, glistening appearance.
Spots coalesce and severely infected leaves fall to the ground prematurely.
Fruit lesions are larger than those on leaves and cause the fruit to crack and drop. Fruit lesions are much like those on leaves, but they are black and slightly sunken. They may be so numerous as to run together and make the fruit crack. Lesions on twigs occur on current-season growth. They are purple to black, with indefinite margins.