Gray and Pink Snow Mold

Apperance

Other than appearance, Gray and Pink Snow mold are nearly identical. 

Pink Snow Mold: Large grayish white to pink patches; can be small or up to several feet in diameter. The grass blades within the patches will be collapsed and matted.  

Gray Snow Mold: Same as above, but gray instead of pink. Gray Snow mold may have The tiny round dark spheres are called “sclerotia”. 

Susceptible species & Favorable conditions

Susceptible species: All cool season grasses, especially prevalent in bentgrass. Can sometimes occur in dormant warm season grasses. 

Favorable conditions: Typically occurs when temperatures are between 32°-45°F with persistent snow cover. Temperatures just above freezing and high humidity promote snow mold disease development.  

Recommended cultural practices

  • Avoid heavy fall fertilization, especially with water-soluble nitrogen.
  • Mow in the fall up until the turf enters dormancy.
  • Maintain a soil pH of 7.0 or less.
  • Reduce soil compaction and avoid compacting snow where snow mold damage has previously occurred.
  • Remove snow and improve drainage in susceptible areas.
  • In the spring, rake and fertilize damaged areas, which will stimulate turf regrowth.
  • Melt snow with darkening agents such as compost

Control

While primarily used for weed control, our Dandelion Doom is an effective means of treating both snow molds.  The fungi doesn’t like excessive amounts of Iron, the key ingredient in Dandelion Doom.

Photo credits: William M. Brown Jr., Bugwood.org