Red Thread

Causal Agent: Laetisaria fuciformis

Susceptible Turfgrasses: Cool season turfgrasses.


  • Circular or irregularly shaped, small to large patches (5 to 15cm) in diameter of infected grass become water-soaked and die rapidly.

  • First symptoms observed is the tan colour of dead leaves.

  • Dead leaves are generally interspersed among uninfected leaves giving an overall diffuse, scorched or ragged appearance to the patch.

  • Only the foliage is infected and death usually proceeds from the leaf tips downwards.

  • Pink to pale red or orange fungal growths (red threads) may extend up to 10mm beyond the leaf tips.

  • Pink, cottony flocks of mycelium may be produced.

  • When red threads or strands are present, the patched of blighted grass take on a reddish, pink or tan cast that is easily detected.

Conditions Favouring Disease

  • Foliar wetness, heavy dews, light rains and fog resulting in more than 10 hours a day of foliar wetness for several consecutive days.

  • Thrives in temperatures between 17°C to 29°C.

  • Severe when potassium, phosphorus, calcium and nitrogen are deficient.

  • Read Thread causes disease primarily during periods when grass is growing slowly as a result of low temperatures, drought or inadequate fertility.

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Products to Use Red Thread

Velista Turf Fungicide


Velista is a powerful broad spectrum fungicide that can be used all year round and can be trusted to keep your turf…

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Vantage Fungicide

Amgrow-Vantage-5L_bottle copy

Vantage fungicide is a broad spectrum, systemic fungicide containing 95 g/L of the active constituent Azoxystrobin, a trusted chemistry for Australian turf…

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