Slime Mold

Grass Affected

All grasses.

Diagnostic Description

  • The spore stage is most frequently encountered. White, gray, powdery fruiting bodies cover leaves in patches of 6 to 12 inches in diameter during warm-wet weather. The fungi move to the tips of plants which provides for wind dispersal of the dark powdery black spores. During the day, ruptured fruiting bodies may cover grass leaves with the black, soot-like spores. These fungi move about as protoplasmic or “slime” stage and feed saprophytes on bacteria, fungi, and decayed organic matter in the soil.

Conditions Favoring Infestation and Typically Yearly Occurrence

Most often during warm, wet weather especially after periods of heavy rainfall in summer.