Anthracnose can be caused by two organisms. Glomerella cingulata causes brown spots on the fruits which turn black, then rough, then mummify and drop. Sphaceloma symphoricarpi causes dark purplish or black spots on the leaves. The spots have gray centers. The leaves, flowers, fruits and stems may become distorted. The fruits may be shrunken and have a pink discoloration. Prune out infected branches. No chemical control is listed.
Berry rot causes brown, soft, watery fruit. This problem often occurs with anthracnose. No chemical control is listed.
Other leaf spots are an occasional problem. Rake up and destroy infected leaves. Use basic copper sulfate.
Powdery mildew covers the leaves with a white coating. Use benomyl or sulfur.