Plus the disease detracts from the appearance of plants. A good way to start, if you haven't already done so, is to rake and destroy diseased foliage from last season. This practice is an essential part of the control program since it removes one of the main sources of fungus inoculum. Fungicide sprays are also generally necessary in a control program for this disease. Best control of photinia leaf spot is obtained with preventive sprays timed from bud break and applied every ten to fourteen days until all foliage has matured.
Mature foliage is no longer susceptible to infection.
Provided applications are made on schedule, plants should not be affected by leaf spot. A commonly available brand of this latter fungicide is Dragon Lawn and Vegetable Disease Control. Other trade name chlorothalonil and mancozeb are generally available at garden supply stores, so check with your dealer for product availability. Refer to product labels for dilution rates and other information regarding application. For additional information, please feel free to check with us at the County Extension Office.