Q: Perfect circle of dead centipede grass around oak, expanding yearly.
A: Fairy ring—soil fungi decomposing organic matter, expanding slowly. UGA's Alfredo Martinez: manage by reducing soil organic matter, fertilizing to mask symptoms, core aerate/dethatch. Radical: dig out 1 ft band to 8-12 in depth, refill with topsoil, resod. Most fungicides ineffective.
Fairy Ring in Turfgrass
Fairy ring control
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