Red thread is a foliar disease that usually occurs on taller mown turfgrasses during spring and fall. Red thread symptoms create an undesirable appearance, but crowns and roots are not infected, so plants are not killed and turf eventually will recover.Red thread takes its name from the antler like structures (sclerotia) produced by a fungus (Laetisaria fuciformis) on the tips of infected leaf blades. The red or pink sclerotia are visible without magnification and are useful for identifying the disease in the field. From a distance, red thread symptoms appear as circular patches of tan or pink turf about 4-8 inches in diameter. The pink color is caused by the sclerotia and/or flocks of pink mycelium on leaf blades. Other diseases, including dollar spot, pink snow mold, and especially pink patch, have field patterns and symptoms that resemble red thread, and are active during similar environmental conditions. However, after close inspection, red thread is easily distinguished from other diseases by the presence of the sclerotia. Red thread most commonly affects Kentucky bluegrass, perennial ryegrass, and tall fescue. Outbreaks usually occur in low maintenance turf stands such as residential lawns, golf course roughs, and some low budget athletic fields. Red thread development is most common where turfgrass nutrition is poor and there are other factors that promote slow growing turf.Disease development occurs over a relatively wide range of cool conditions (40-70° F), typically in the spring and fall, especially during long evening dew periods. Although the disease is often associated with malnourished, low-quality, slow-growing turf, a rapid build-up of inoculum can result in outbreaks on well managed turf, including golf course fairways and tee boxes.

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