Pink Snow Mould
Causal Agent: Microdochium Nivale
Hosts: All turfgrasses in Canada
Epidemiology: Pink Snow Mould is the name given to the phase of the Mircodochium nivale pathogen which develops under snow cover. The pathogen, which can infect a plant in as little as 30 days of snow cover, is active from 0°C to 16C°.
Evidence: Radial growth of mycelium, under snow cover, from initial infection sites results in the distinct round patches (up to 12 inches in diameter) which may be covered with fluffy white mycelium. As the snow melts, patches appear bleached white to tan, sometimes with a pink margin.
Clues: Sunlight can induce the production of pink mycelium which results in the classic ringlink patch with a pink outer margin. A distinguishing characteristic of Pink Snow Mould when compared to the Grey Snow Moulds is that it does not produce sclerotia.
- Control fall Microdochium patch as it can lead to outbreaks of Pink Snow Mould
- Mow turf until dormancy to avoid excessive growth
- Remove mulches of fallen tree leaves
- Control drifting snow with the use of snow fences
- Reduce thatch
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