Answer: Bright green circles on lawn indicates a fungal disease called Fairy Ring. Eventually, if the lawn is stressed by warm temperatures and/or inadequate moisture and nutrition, dead grass will appear inside the ring. Most damage is seen on undernourished turf, during mild weather. You can mask the symptoms by fertilizing and watering deeply, or you can rake over diseased areas to loosen them up and then reseed. For permanent control, dig out the diseased sod plus affected soil, replace with fresh topsoil, and then reseed the area.
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