Identifying Slime Mold in Lawns: Harmless Nuisance

Identifying Slime Mold in Lawns: Harmless Nuisance

A single yellow, foam-like growth appears on a lawn. Owner wonders if it's animal feces or a disease.

Yellow slime mold

It's Slime Mold (Myxomycete)

• Not a fungus, not a disease—closer to amoebas.
• Feeds on bacteria and decaying organic matter in thatch/soil.
• Appears suddenly after rain/watering in warm weather.
• Colors: yellow, orange, white, gray, purple.
• Dries to a powdery spore mass.

No Control Needed

• Harmless to grass, pets, people.
• Disappears on its own in dry weather.
• Can be swept off with a broom or hosed off when dry.
• Fungicides are ineffective and unnecessary.

Consider it a fascinating, temporary visitor!