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GreenCast Korea - Red thread

Caused by: Laetisaria fuciformis (McAlpine).

Plate 1: Red needles and pink flocks of mycelium


The symptoms depend on the grass species and severity of attack. Symptoms often start as small mostly circular patches of dead leaves interspersed with live plants. The patches may also have a pink tinge (Plate 2). Closer inspection will reveal pale pink to red needle or horn-like outgrowths (the red threads - Plate 2) Pink flocks of mycelium (resembling candyfloss) may also be present in conducive conditions.

Plate 2: Symptoms of red thread

Where is red thread found?

Any area of turf, especially golf greens, tees, fairways, bowling greens, lawns, parkland and sports pitches

When is red thread likely to attack turf?

When growing conditions are good infection may be transient but under poor growing conditions attacks may be severe

Effects of red thread

Red thread does not commonly affect the playing quality of the turf but reduces the aesthetic appearance.

Red thread may thin the sward.

High risk situations

Fescue is the most severely affected, although there is variation among subspecies and cultivars. Lolium perenne is also very susceptible.

Low fertility.

Warm and wet conditions.

Slowly growing turf.

Moisture retentive turf surface


Use recommended rates of fertiliser at the recommended timing to prevent low fertility problems occurring

Oversow with grass varieties that are less susceptible to red thread

Maintain good drainage and manage the turfgrass to reduce surface moisture

Keep thatch layers to a minimum.

Light penetration (especially morning sunlight) and airflow should be encouraged to dry the turf surface quickly

Collecting clippings helps to prevent the spread of infected material

Fungicidal control

Daconil Turf has a label recommendation for red thread control in the UK.

Parameter Daconil Turf
Mode of action Contact
Optimum timing At first sign of disease
Dose rate 30 l/ha
Water volume 500 l/ha


Trials have shown that Heritage also controls red thread.

Suggested Programme

When red thread is observed, apply 8.0.0 (N.P.K) at recommended rate. However be careful in autumn months to prevent microdochium patch occurring.

If symptoms are not suppressed by fertiliser application apply Daconil Turf.