Control can be achieved by using a sterile potting mix and clean pots. It is also helpful to avoid overwatering, especially in the crown area of the plant. It is important to never let the plant sit in standing water. Highly symptomatic plants can be rogued and removed since recovery is unlikely. Botrytis blight or Gray mold, Botrytis cinerea.
Infected flowers develop tan, papery patches and are often covered with gray, fuzzy masses.
Senescing flowers are particularly susceptible. Tan to brown spots with a target-like appearance can also develop on the leaves. These patches are often associated with flowers which have dropped onto the leaf surface. 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.