Symptoms often appear in early summer when conditions are warm and very humid.
All plant parts can be infected including leaves, flowers, and stems. Infected tissues are often covered with the characteristic gray, fuzzy growth of the fungus. Good sanitation practices including grooming the plants and removing spent or senescing flowers can minimize the potential for infection. These affected tissues should be carefully removed and discarded when they are dry. It is also important to avoid wetting the flowers when watering and crowding plants.