The flower buds die without opening. The disease is worse in spring. Cut out and destroy infected plant parts.
Crown gall causes formation of roundish galls with irregular rough surfaces.
Galls above ground level should be pruned off and destroyed. Galls on the plant crown are not easily pruned off so destroy the whole plant. Avoid infested soil. Rose anthracnose causes purplish brown, circular, one-half inch leaf spots. The center of the spot turns gray and drops out.