All lawn grasses
From late spring to early fall, fairy ring mushrooms can disfigure a lawn. The disease is especially a problem in acid soils and in areas where there is buried wood. As the mushroom fungus multiplies, its white underground growth, or mycelium, becomes so dense and tough that water cannot penetrate the lawn. Starved and thirsty as weather warms up, grass around the mushrooms initially begins to die. However, the dying mycelium provided nutrition to the grass above it, which turns green again. Fairy Rings may be small to several hundred feet wide. They expand about 1-2 feet per year.
Fairy ring damage appears in a target pattern: a brown area surrounded by a wide circle of dark grass. Small, tan mushrooms appear within or just outside the grass circle. Sometimes there is an inner circle of dark green grass as well. The grass in these circles may be greener than any other grass in your lawn.
Remove old tree roots and stumps; pick all mushrooms, before caps open up and release spores; apply lawn fertilizer containing nitrogen to revitalize fairy ring center; aerate soil during the growing season; water and mow more often. There is no chemical control.