Management Ensure adequate fertilization and dispose of clippings when symptoms are evident. Remove excess shade and maintain good soil moisture. Several fungicides can be used to help control the disease. Turf Affected All grasses Symptoms White, gray, powdery fruiting bodies that cover leaves in patches 6 to 12 inches in diameter during warm, wet weather. Fungus usually disappears during dry weather.
Management Remove by brushing, mowing, or washing the turf.
Slime molds are not considered harmful and do not require fungicide treatment. Dead spots appear in the spring as grass resumes growth, usually after lawn is at least 3 to 5 years old. Spots expand for 3 to 4 years, often developing into rings, and then disappear. Infected areas recover slowly and weeds frequently invade these areas during the summer. Management Avoid excessive nitrogen fertilization and do not apply nitrogen after late August.