Die-back of infected twigs is common, with dead leaves remaining on the twig. Vigorous plants can tolerate some damage from this disease. Prune and destroy infected twigs to prevent over-wintering of the disease. Rake and destroy all fallen leaves, both during the summer and in the fall. Do not compost diseased materials.
Many problems result from damage to bark caused by lawn mowers and string trimmers.
Always mulch around the base of dogwoods to conserve moisture and prevent damage from lawn mowers and string trimmers. Water thoroughly once a week during periods of drought. If your tree doesn't already have mulch around it, you should do so immediately. Be very careful not to damage the bark. Then ring the circle with rocks or some other barrier to protect the tree from Lawn mowers etc.