Overgrown Patches On Lawn - Knowledgebase Question

San Luis Obispo, CA
Question by mpritch22
September 2, 1999
We have a normally healthy lawn, mainly fescue. We've lived here 3 months. I haven't fertilized but water regularly. The ground is somewhat uneven and was largely dug up to put in a drain system about a year ago. The lawn has numerous circular spots about 2 ft. in diameter which are exceptionally bright green and very fast growing. I mean very fast. What is this? Why does it happen? What can I or should I do about it?


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Answer from NGA
September 2, 1999

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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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