Scientific name
Physarum spp., Fuligo spp. and Mucilago spp.
Common Names
Slime Mould, Dog Vomit Slime Mould
Slime mould is not a true fungus or a turf disease, but a group of amoeba-like organisms (protists) that feed on decaying organic matter, bacteria and fungi in the thatch and soil. It commonly appears after prolonged periods of warm, wet or humid weather as grey, white, yellow or orange powdery masses coating grass blades. While unsightly, slime mould does not infect or damage turf and usually disappears as conditions become drier.
Similar Diseases
- Pythium Blight (Pythium spp.)
- Grey Snow Mould (Typhula spp.)
- Powdery Mildew (Erysiphe spp.)
- Algae
SCENARIOS AND SOLUTIONS
On lawns with light slime mould after wet weather: Brush, hose or mow the affected area to remove the fruiting bodies. Fungicide is generally unnecessary.
Where slime mould persists on high-value turf: Apply Copper Oxychloride only if prolonged growth affects turf presentation, alongside reducing excess moisture and thatch.
On golf greens and sports fields with recurring outbreaks: Improve drainage, increase airflow and reduce excessive irrigation to discourage further slime mould development.
Where excessive thatch or organic matter is present: Verticut or dethatch the turf and improve surface drying to reduce favourable conditions for slime mould.
References
https://extension.psu.edu/turfgrass-diseases-slime-molds
https://www.turffiles.ncsu.edu/diseases-in-turf/slime-mold-in-turf/
