Improved bermudagrass, zoysiagrass and bahia- grass are more susceptible. Adequate nitrogen and spraying with a turf fungicide is recommended to control the disease. Affects improved bermudagrass. Infected grass rapidly dies in spots or streaks. The disease occurs in poorly drained areas during warm, humid weather.
Fungicides are effective for control.
Mushroom-producing fungi develop on organic matter in the soil and produce fruiting structures on the outer limits of the colony, causing a circular effect. Grass is often greener in the ring areas because of available nutrients liberated by decomposition of the fungus. Grass in the center of the ring may be declining because of fungal activity. Warm, wet weather enhances this disease. Control often is not necessary because of the condition's temporary nature.