Necrotic Ring Spot

University of California IPM — UC Management Guidelines for Necrotic Ring Spot on Turfgrass. Necrotic ring spot appears as large, ring-shaped patches that often cause depressions in the turf. Rings may vary from a few inches to several feet in diameter. Individual plants ...More…

Necrotic Ring Spot Disease of Lawns

North Dakota State University — Necrotic Ring Spot disease (NRS) symptoms start with conspicuous patches or rings of dead grass that appear suddenly. This usually occurs during dry periods following periods of wet weather. Scattered light yellow patches, typically two to six ...More…

Necrotic Ring Spot in Turfgrass

Colorado State University Extension — Necrotic ringspot (NRS) is a perennial disease of Kentucky bluegrass. NRS results in circular or doughnut-shaped patches of dead grass. NRS can be controlled by the use of resistant varieties, good turf management practices and fungicide ...More…