Avoid high nitrogen, wet soil, compaction and low mowing. This is primarily a leaf disease which occurs during the summer. It is favored by hot, humid periods and poorly drained soils. Circular small spots are matted, grayish, or water-soaked. Patches will follow surface water flow patterns.
Infected blades collapse rapidly, are greasy-looking, and wilt rapidly.
Fungal growth can be seen in early morning. Plants will often die in 24 hours. Dead plants are often red-brown to brown in color and matted together. Bluegrass, fescues, and especially perennial ryegrass are killed by this disease. Avoid high nitrogen, leaf wetness and thatch.