Causal Agent: Pyricularia grisea
Susceptible Turfgrasses: Buffalo grass and Ryegrass.
Symptoms
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Symptoms of Grey Leaf Spot vary depending on the grass cultivar.
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Grey Leaf Spot first appears as tiny, brown leaf and stem lesions, which enlarge rapidly into round to oblong spots.
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The largest spots may extend nearly across the entire leaf and become a bluish-grey in colour.
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Mature lesions are tan to grey with purple to brown borders.
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A halo or general chlorosis may occur around or near spots.
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The spots may be covered with a grey mould during periods of warm, humid weather.
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When the disease is severe, the entire planting may appear scorched as if it were suffering from severe drought.
Conditions Favouring Disease
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Grey Leaf Spot is most severe during warm, humid weather.
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Temperatures between 25°C to 30°C.
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When turfgrasses are stressed by various factors, including drought, soil compaction and excessive nitrogen.
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Products to Use Grey Leaf Spot
Dedicate Forte Stressgard
Dedicate FORTE Stressgard® is a broad-spectrum DMI fungicide containing tebuconazole (240 g/L) with Stressgard Formulation Technology, and controls tough soil-borne and…
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The newest fungicide innovation from Bayer has you covered, providing outstanding broad-spectrum disease control, turf quality and application flexibility. Contains a…
Read moreVantage Fungicide
Vantage fungicide is a broad spectrum, systemic fungicide containing 95 g/L of the active constituent Azoxystrobin, a trusted chemistry for Australian turf…
Read moreReserve Stressgard
Reserve Stressgard turf fungicide is a contact and protectant fungicide for the control of fungal diseases in turf. With the added benefit…
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