What are my red threads?

Red thread is caused by Laetisaria fuciformis, a fungus. Infection occurs on the leaf and stem parts, not the roots. The pathogen rarely kills plants, but does weaken turfgrass, contributing to decline from other stresses. The disease is spread by water splash, wind, mowers, shoes, and other mechanical means.

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Need to know: Symptoms include irregularly shaped patches of grass becoming blighted.

Signs include bright thread-like strands at the end of infected leaves.

Spread by water splash, wind, movers, shoes and other mechanical means.

Manage by avoiding mowing when turf is wet, raising mowing height, and avoiding frequent sprinkling in late afternoon.

Fungicides may be necessary if turf has history of red thread.

Predisposing Conditions for red thread

Water-saturated environment associated with rainy weather and slow shoot growth caused by nitrogen deficiency or water stress (although the disease also may develop in well-fertilized turf) are predisposing conditions for red thread.

Symptoms of red thread

Circular or irregularly shaped patches of grass first become blighted and begin turning reddish or pinkish. Eventually the grass dries out and turns a bleached straw-like color. Affected areas initially are 1-2 inches, but may coalesce and form irregular shapes. Infected leaves may appear water-soaked. Dead leaves often are interspersed with green leaves.

Signs of red thread

Bright red fungal structures, called "red threads" (approx. ¼ inch or less long), can be observed extending from leaf surfaces, particularly the cut ends of the grass blades. Tufts of pink or reddish web-like fungal growth can also be seen on leaves, sometimes binding leaves together.

Disease Cycle of red thread

Type of Sample Needed for Diagnosis and Confirmation

The Iowa State University Plant & Insect Diagnostic Clinic can help you to investigate and confirm if you plant has this disease. Please see our website for current forms, fees, and instructions on collecting and packing samples. Contact information for each states diagnostic laboratory for U.S. residents. If your sample is from outside of Iowa please do not submit it to the Plant & Insect Diagnostic Clinic without contacting us

Management of red thread

The following are recommended ways to manage red thread:

Maintain adequate fertility

Raise the mowing height, if possible

Avoid mowing early in the morning when the turf is wet with dew

Avoid frequent sprinkling in the late afternoon

Collect grass clippings when red thread is active to reduce the number of red threads that fall back into the turf A fungicide program may be necessary on turf with a history of red thread. Labeled products include Banner, Cavalier, Chipco 26019, Cleary’s 3336, Compass, Dithane, Fore, Heritage, Junction, Mancozeb, Pentathlon, Protect T/O, Rubigan, and others Fungicide applications may be avoided by following good Integrated Pest Management practices like those listed in this encyclopedia article. Often, the only preventative application is effective to manage plant diseases. If the problem requires a fungicide, state law requires the user to read and follow all labels accordingly. For more information, read Proper fungicide use.

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