Red Thread

Red Thread

Get all of the information you need about red thread so you can identify any issues quickly and take measures to keep your yard healthy.

Type: Fungal Disease

Pathogen: Laetisaria fuciformis and Corticium fusiform

Appearance: Red thread, a fungal disease, manifests as tiny red or pink threads weaving through grass blades, accompanied by tan lesions. This subtle invasion can compromise the visual appeal of your lawn.

Risk Factors: Red thread capitalizes on moist conditions and cool temperatures, particularly in weakened lawns. Nitrogen deficiencies and poor air circulation contribute to grass susceptibility.

Timing: Active during cool, wet weather, red thread primarily occurs in spring and fall, altering the color palette of your lawn.

How to Control Red Thread


Keeping your lawn healthy is the best way to prevent this disease from appearing. Good practices include:

  • Balanced Fertilization: Maintain proper nitrogen levels through balanced fertilization to fortify grass against red thread invasion.
  • Improved Air Circulation: Reduce thatch and enhance air circulation with regular lawn aeration to create an environment less favorable for red thread.
  • Proper Watering: Adopt a morning watering routine to allow grass blades to dry during the day, minimizing conditions conducive to red thread.
  • Regular Soil Testing: Conduct periodic soil testing to identify nutrient deficiencies for targeted fertilization.
  • Grass Variety Selection: Opt for red thread-resistant grass varieties to reduce susceptibility.


  • Fungicide Application: Apply fungicides labeled for red thread control during periods of active infection to manage its spread.
  • Address Nutrient Deficiencies: Correct any nutrient deficiencies through targeted fertilization to enhance overall grass health.

Transform Your Lawn with Personalized Treatment Plans for Red Thread

Our agronomists specialize in creating personalized treatment plans, addressing specific issues like red thread with precision. Beyond immediate control, our eco-friendly practices contribute to the overall well-being of your lawn and the environment. Contact us today for a customized lawn care plan, and let the transformative power of agronomic expertise revive your lawn’s vitality.

Need Help with Red Thread?

Call Green Image Lawn Care today at 717-900-8144 and let's talk about how we can help you with Red Thread and other lawn diseases.