In Newnan, Georgia Fairy Ring, a ring of mushrooms, is a natural occurring lawn disease caused by mycelium, a fungus that feeds on organic material beneath the soil surface.  The mycelium fungus grows underground in the soil as a mass of elongated, branching, thread like webs.  As the mycelium feeds on organic material, nutrients are released back into the soil which creates a deep green or brown circle around the affected area.  You may observe mushrooms in your home lawn around the perimeter of the fairy ring especially during warm, wet periods.  While the symptoms of the fairy ring may be unsightly, it does not damage your desired turf grass stand.  To manage fairy ring in your lawn reduce thatch buildup, aerate at least once a year and irrigate your lawn deeply and infrequently. Remember the best defense against lawn diseases is a healthy and well maintained turf stand.