Recently added item(s)
You have no items in your shopping cart.
Personalize your experience with Penn State Extension. Subscribe today!
Save For Later Print
Updated: August 8, 2017
Mature leaf spots are recognized easily by their grayish-white centers with sharply defined margins. Appearing first on upper leaf surfaces as small, brown lesions, they enlarge from 1/8 to 1/4 inch in diameter. The borders become dark brown, and small, black pimples appear in the centers.
Sexual spores are produced on overwintered, fallen leaves and are carried by air currents to newly formed leaves. About a month after infection, new spores are generated in the centers of the grayish-white leaf spots, from which they are washed by rain to other leaves. These secondary infections usually peak in late summer or early fall.
Routine fungicide sprays normally control this disease in Pennsylvania. The control program for Fabraea leaf spot will usually control this leaf spot as well.
Thank you for your submission!