Slime Mold - Warm Season Grass

This white, powdery mass on grass is caused by slime mold

 

Grass species affected

Disease occurrence

  • May through November

Symptoms

  • 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.

Management

  • 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 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 rising with water and drying with a cloth.
  • Slime mold isn’t considered harmful to the lawn and doesn’t require fungicide treatment.

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