Remove old mummified fruit from the tree and ground before spring for brown rot control. Scab Scab is a fungus disease. It overwinters in shallow lesions or wounds on the twigs. Infected areas on the fruit appear as greenish-black spots. You will begin seeing these spots about 3 weeks after petals fall.
Severe damage causes the peach to crack open.
Peach Leaf Curl Peach leaf curl is caused by a fungus. Infected leaves become enlarged and tend to curl. The leaves drop from the tree, weakening it so that it may not hold and develop its fruit. Peach leaf curl does not occur regularly on most peach and plum trees. A dormant fungicide applicator is necessary to control this disease.