Reddish-black spots surrounded by a yellow zone appear on the leaves. Control includes fertilizing to encourage moderate growth. Apply water in early morning and water deeply and infrequently. Mow as high as the use will allow. Prune woody landscape plants to remove dense shade.
Fungicides are effective if cultural controls fail.
These grow together and cover much of the leaf surface, generally the lower ones. Leaves may become puckered and eventually yellow. It is usually observed in spring and fall during cool humid periods and most often found in shaded areas where air circulation is poor. Heavy fertilization favors this disease. Control strategy includes a blend of shade-tolerant grasses.