Brown patch is one of the most prevalent lawn diseases during the spring or fall season.
Brown patch is characterized by the development of irregular, circular areas a few inches to several feet in diameter. These areas may have a brownish to gray discoloration. In certain grasses, a narrow, dark, smoke-colored ring may border the diseased area. These water-soaked or scalded spots in the lawn spread rapidly, becoming large, brown areas. Generally, brown patch fungus attacks the base of leaf sheaths where they are joined to stolons.