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This NebGuide describes the symptoms and disease cycle of brown patch and gives recommendations for its prevention and control through management, including use of fungicides.
Brown patch of turfgrass is caused by the fungus Rhizoctonia solani Kuehn. All commonly cultivated turfgrasses in Nebraska are affected by this disease, but differences in susceptibility exist within cultivars of the various turfgrass species. Primary hosts are bentgrass, perennial ryegrass, tall fescue and annual bluegrass. Certain species of Rhizoctonia are capable of attacking turfgrass plants from seedling stage to mature plants and are pathogenic over a wide range of environmental conditions. In some literature, brown patch may be referred to as Rhizoctonia blight. In zoysiagrass, it is referred to as large brown patch.