The amount you use to irrigate should be this value less the amount of rainfall since the last irrigation. Although they are a minor problem, you may encounter several diseases in your lawn. Most are caused by fungi that attack leaves and cause thinning of the grass. A fungus disease occurring during moist, warm conditions in spring. 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.