Red Thread

Red thread is a fungal disease common in cool, moist regions. It may occur on bentgrasses and bluegrasses but is most common on red and chewings fescues and perennial ryegrasses.

Start with sanitation: remove and dispose of affected material as you find it. Thin dense growth to improve air circulation, and redirect irrigation away from foliage. If the condition persists despite cultural adjustments, your local Extension office can help identify the pathogen and recommend targeted treatments.