Spots enlarge and are usually angular in shape.
If conditions are favorable, white pink spore masses of the fungus will be visible in the center of the lesions. If disease is severe, the lesions will coalesce and cause significant dieback of the leaf. As spots age, the affected tissue will dry up and become papery in texture. This disease requires cool, wet conditions for infection and symptom development. Anthracnose is most often associated with rainy springs.