Situation: Predominantly Couchgrass at golf and bowling greens.
Turf damage: Small white patches which can coalesce and give the turf surface a general white colouration.
Occurrence: The pathogen causing this disease is unknown. This is a disease of closely mown Couchgrass (e.g. bowling greens). Symptoms generally appear in autumn and persist until spring. The quality of the playing surface is not affected.