Trees having adverse growing conditions are more susceptible to or are more damaged by dogwood anthracnose disease. Protect trees from drought by watering at least once a week during dry spells. Do not use overhead sprinklers. Reduce nearby shade to promote greater photosynthesis, but not so much as to cause heat and moisture stress. The Discula fungus greatly damages the tree if it enters the trunk via sprouts and bark injuries.
Some trees have genetic resistance to dogwood anthracnose.
Left unchecked, the Discula fungus and the disease it causes will, under the right conditions, continue to develop in the tree. Rake up and destroy fallen leaves in autumn. If the tree is valuable enough, fungicide sprays may be warranted. Fungicides should be applied beginning at bud break in the spring and continued biweekly until hot, dry summer weather. Thorough coverage is essential.