Grass species affected
- May through November
- White, gray, powdery masses that cover leaves in patches 6 to 12 inches in diameter during warm, wet weather. The fungus usually disappears during dry weather.
- Remove slime mold by brushing or mowing the affected area to knock down the mold.
- Mow unaffected areas first and diseased areas last to avoid infecting a healthy lawn.
- Collect and dispose of grass clippings in the garbage when slime mold is present.
- To avoid spreading the fungus, after mowing, clean the mower blades by rinsing with water and drying with a cloth.
- Slime mold isn’t considered harmful to the lawn and doesn’t require fungicide treatment.