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Summer Patch Disease

Summer Patch disease is a summer disease that causes the death of bluegrass and fine fescue grasses. An easy way to identify this disease is the ‘frogeye’ appearance, as shown in the pictures. This disease will begin to appear when the soil temperatures reach 64 degrees. It is favored by excessive nitrogen, high soil pH, and low mowing heights. Fungicides should be applied in May, June, and July to help suppress outbreaks. Once symptoms appear, recovery is slow. It is best to seed the affected areas with ryegrass, as the disease does not affect this type of grass. Since high soil pH is another precursor to this disease, liming the turf is generally not recommended.