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. This minor disease occurs primarily from late summer to fall especially in shady areas. The leaves of infected pants have a white to gray powdery growth that gives the leaves the appearance of having been dusted with flour or lime. Infected blades may yellow, wither and die.