Slime Mold Disease

Slime mold is a non-parasitic disease caused by saprophyte fungi, or fungi that feed on dead or decaying organic matter. 
This disease affects all warm and cool season grass types across the U.S. and its effects can be observed from the late spring through the fall season.

What to Look For:

slime mold on turf grassSlime mold appears on grass blades as small, fruiting bodies that resemble ash and are white, gray, or purplish in color.
Grass infected with slime mold generally does not turn yellow as the fruiting bodies tend to disappear within a few weeks.
In warm, rainy conditions, slime mold may spread from grass to the lower branches of ornamental plants or across planting beds containing mulch to release their spores.
Slime mold pulls itself along the soil surface with finger-like projections and it can sometimes have an appearance similar to vomit.


Slime mold is a versatile pathogen that can affect any type of warm or cool season turf grass.  The pathogen spreads most effectively in cold, humid weather and the disease develops most effectively in warm, humid weather.
Its spores can remain within your lawn for years until the weather conditions are right for it to grow.

Slime Mold Control:

While slime mold may have an undesirable appearance in your lawn, it is relatively harmless to the lawn and even beneficial to the ecosystem of a landscape.  Control is largely unnecessary yet there are a few things you can do to minimize its appearance:

  • Sweep or rake the spores to remove them from the grass blades
  • Water can wash away slime mold spores
  • Slimy patches in mulch can be raked out or under the mulch
  • Regular mowing can remove spores from the grass
  • Lawn aerations can reduce the amount of thatch the mold feeds on

If you think Slime Mold is infecting your lawn, don’t hesitate to contact us to assess your problem and provide a solution.

Call us: (630) 231-0007

For more information about this and other lawn diseases, visit our disease prevention page.

2018-04-06T14:49:22+00:00 Lawn Diseases|