Slime Mold in Turf | NC State Extension Publications (2024)

Many small, round pustules are observed on the turfgrass leaves in small patches. The patches develop very quickly, usually overnight. The pustules may be purple, white, gray, yellow, or orange in color. The slime mold organisms do not infect the turf or cause direct harm, but they can cause mild yellowing of the leaves due to their shading effect. Slime molds are unsightly but are not considered harmful.

Slime mold spores survive in the soil and thatch. During warm, wet weather the spores germinate and develop into a slimy mass that grows over the soil and nearby plant parts during wet weather. The pustules observed on turfgrass leaves are reproductive structures that contain numerous spores.

Flushes of slime mold growth are often observed after heavy rain storms that were preceded by long periods of dry weather.

Slime mold pustules typically disappear after 2 to 3 days; therefore, no control practices are needed. If the growth is particularly unsightly, the pustules may be removed by brushing, mowing, or washing the turf.

Recommendations for the use of agricultural chemicals are included in this publication as a convenience to the reader. The use of brand names and any mention or listing of commercial products or services in this publication does not imply endorsem*nt by NC State University or N.C. A&T State University nor discrimination against similar products or services not mentioned. Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. Be sure to obtain current information about usage regulations and examine a current product label before applying any chemical. For assistance, contact your local N.C. Cooperative Extension county center.

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