Black slime mould often grows on cultivated and weedy grasses during wet times of the year. Slime moulds are 'primitive' fungi that use grass blades for structural support. Although black slime mould will not directly harm the grass, it is easy to remove.
Black slime mould usually appears during wet weather from late spring to late fall. It will disappear naturally when dry weather returns.
Effects on Grass
Although black slime mould does not directly harm grass, it can damage its appearance and may also interfere slightly with photosynthesis.
Black slime mould can turn powdery. If your black slime infestation is located near your house, the powder may blow into your house.
Black slime moulds often occur in the same location year after year. Improving the drainage of these locations can help eliminate recurring black slime mould.
Mowing the grass will remove black slime mould. Slime moulds can also be washed off with a powerful garden hose, but if the leaves stay wet afterwards, this may exacerbate the infestation.
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