Fertilize and root-irrigate to maintain vigor and promote refoliation of affected areas of the plant. Avoid overhead irrigation on or near affected plants, especially at night or late in the day. Prune away surrounding shade- producing vegetation to promote dry air movement over the affected plants. Thin plants if needed to improve air movement and speed drying time. If necessary, spray with a properly labeled fungicide during bud break in the spring.
Leaves develop brown, rotted areas.
Stems and flower stalks may suddenly wilt and fall over. Flower buds may turn dark and fail to open. Opened flowers appear rotted and discolored and fall prematurely. During wet weather, affected areas may be covered with brown, fuzzy sporulation of the Botrytis fungus. Cut off, rake, and burn plant debris in the fall.