Turfmate field notes · Diseases

Red thread

Laetisaria fuciformis

Pink or red threads on pale leaves can explain discoloured patches.

Pink fungal growth identified as Laetisaria fuciformis on grass in Germany. Red thread can show pink tufts as well as its characteristic red structures.
Pink fungal growth identified as Laetisaria fuciformis on grass in Germany. Red thread can show pink tufts as well as its characteristic red structures.
Photo: bjoerns · source · CC BY-SA 4.0. Displayed at reduced size; card crops fit the layout.

What to look for

  • Pale or tan leaves within irregular patches.
  • Red thread-like structures extend from affected leaves.
  • Pink tufts may be visible when leaves are wet.

Confirm it before you treat it

Look closely at a fresh patch edge. A reddish lawn from a distance is not enough; photograph the thread-like structures. Compare with Microdochium patch where wet matted leaves or pink growth may also occur.

What to do next

  1. Review slow growth, light and nutrition rather than adding fertiliser without checking the need.
  2. Reduce unnecessarily prolonged leaf wetness and improve air movement where practical.
  3. Clean affected clippings from equipment before moving into unaffected areas.
Seasonal watch

Conditions matter more than dates.

Moist leaves and slow-growing susceptible turf create an opportunity. The disease can appear outside its usual seasonal window.

Cool to mild wet spells, often around spring and autumn in temperate sites, warrant inspection.

Explore your region & month ↗

Is red thread the same as winter Fusarium?

No. Look for the characteristic red structures and get uncertain samples checked before choosing a treatment.

Inspect & compare

More views. Better clues.

Read each caption and compare fresh symptoms in your own turf.

Red thread (Laetisaria fuciformis) on grass in Denmark. Close inspection of the red structures helps distinguish it from general yellowing.
Red thread (Laetisaria fuciformis) on grass in Denmark. Close inspection of the red structures helps distinguish it from general yellowing.
Photo: Tina Ellegaard Poulsen · source · CC BY 4.0. Displayed at reduced size; card crops fit the layout.
Keep investigating

Similar problems. Different solutions.

Reviewed 11 October 2026 · Turfmate. Seasonal windows are indicative planning guidance, not measured outbreak or prevalence data.

Technical sources & image credits

Photos support identification and may have been taken outside Australia. Appearance varies with species, mowing and conditions. A Turfmate product link does not imply endorsement by a photographer or source.