Grey Leaf Spot

Causal Agent: Pyricularia grisea

Susceptible Turfgrasses: Buffalo grass and Ryegrass.


  • Symptoms of Grey Leaf Spot vary depending on the grass cultivar.

  • Grey Leaf Spot first appears as tiny, brown leaf and stem lesions, which enlarge rapidly into round to oblong spots.

  • The largest spots may extend nearly across the entire leaf and become a bluish-grey in colour.

  • Mature lesions are tan to grey with purple to brown borders.

  • A halo or general chlorosis may occur around or near spots.

  • The spots may be covered with a grey mould during periods of warm, humid weather.

  • When the disease is severe, the entire planting may appear scorched as if it were suffering from severe drought.

Conditions Favouring Disease

  • Grey Leaf Spot is most severe during warm, humid weather.

  • Temperatures between 25°C to 30°C.

  • When turfgrasses are stressed by various factors, including drought, soil compaction and excessive nitrogen.

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Products to Use Grey Leaf Spot

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…

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Reserve Stressgard


Reserve™ Stressgard® turf fungicide is a contact and protectant fungicide for the control of fungal diseases in turf.

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25.6% iprodione, 1.6% trifloxystrobin Interface has preventative, curative and eradicant activity, controlling all stages of turf disease. Interface provides superior disease…

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