Brown ring patch is a recently [when?] described Rhizoctonia-like disease of turf grass caused by the fungus Waitea circinata var. circinata.[1] The disease primarily affects putting greens and causes yellow or brown rings up to 1 metre (3.3 ft) in diameter. Brown ring patch was first observed in Japan and has since spread to the United States (approximately 2005) and China (2011).[1]