Answer: Your lawn could have a number of fungal diseases of just fairy ring mushrooms. Without seeing the ring I can only guess as to what disease it would be. Perhaps it's dollar spot? General controls include decreasing nitrogen fertilizer, not watering in the evening, amending the soil with compost to provide better drainge and biological activity and providing enough sun and air circulation to dry out wet grass. Contact your local County Extension Agent for more information in your area about lawngrass diseases.
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