Lawn Academy

Necrotic Ring Spot
Ophiosphaerella Korrae
Necrotic Ring Spot is commonly confused with Brown Patch but it actually has a larger outer ring and larger patch of green in the center.
Management
Use moderate to high amounts of phosphorous, nitrogen and potash. Minimize shade and apply fungicide.
Prevention
Raise mower height, avoid drought stress, and top-dress and aerate turf as needed.
Identification
Causes