Red Thread Disease in Louisiana Lawns

Understanding Red Thread

Red thread is a fungal disease (Laetisaria fuciformis) causing reddish-pink threads on grass blades, typically appearing during cool, wet periods. It indicates turf stress—often from inadequate nitrogen, drought, or poor air circulation.

Management Approach

1. Confirm diagnosis: Submit sample to local Extension office or diagnostic lab
2. Cultural controls: Improve drainage, increase air flow, maintain proper nitrogen fertility
3. Fungicide option: If severe, labeled fungicides can limit spread

Louisiana-Specific Guidance

Your local LSU AgCenter Extension office provides region-specific recommendations for grass varieties, timing, and approved treatments. Soil testing through them identifies nutritional contributors.

Red thread rarely kills established turf but signals underlying management issues worth addressing.