Elsinoe spot anthracnose produces small, circular, spots on leaves. Maintain tree health through proper watering, mulching, and fertilization. Water during drought periods, but do not use overhead irrigation since this may increase the potential for disease infection and spread. Fertilize as needed, using a balanced fertilizer with fairly low nitrogen content for moderate growth. Rapidly growing, succulent twigs which have been stimulated by excessive fertility are more susceptible to anthracnose infection.
Dogwood borer is a frequent pest that can result in added tree injury and stress.
Check the main trunk and branches for signs of dogwood borer in early spring and in early fall, infested trees develop seeping cracks containing piles of sawdust-like frass. Mechanical damage to tree trunks, such as that caused by lawnmower injury attracts borers. For further information on dogwood borer see publication E-41 . Recommendations for Managing Insects and Mites on Shade Trees and Shrubs , available from your local county extension office. Good sanitation is especially important for trees infected with anthracnose.