Red Thread

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Red thread symptom
Red thread leaf symptom
Red thread mycelium
Red thread on fine fescue


  • Pathogen: Laetisaria fuciformis (McAlpine) Burdsall

former name Corticium fuciforme


  • Common Names: Red Thread


  • Climatic Zone: Temperate


  • Geographic Distribution: North America (temperate), Europe, Australia


  • Favorable Conditions: The fungus appears to grow in a wide range of temperatures from cool to warm. The disease becomes most active with prolonged periods of moisture saturated air (fog, heavy dews, light rain)


  • Hosts:Creeping bentgrass, velvet bentgrass, colonial bentgrass, perennial ryegrass, fine fescue, Kentucky bluegrass, Poa annua


  • Symptoms: circular patches ranging from 2 to 10 inches (5 to 50 cm) in diameter. Characteristic red thread (sclerotia or stroma) protruding from the leaf blade.
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