Primarily attacking cool-season grasses, snow mold is a sneaky disease that only shows once the snow melts in the spring season.
Snow mold often shows up after a heavy snowfall where the ground has not yet had time to fully freeze. In combination with the already moistened grass, leaves and debris, mold slowly grows within the grass. There are two types of snow mold: gray snow mold (also called Typhula blight) and pink snow mold (also called Microdochium patch or Fusarium patch).
Often showing up during spring once the snow melts, straw-colored circular patches ranging in size from a few inches to several feet across may appear in the lawn. The grass in these patches is usually matted down and crusty. The patches will have a grayish-white appearance if they are caused by gray snow mold, or a whitish-pink appearance when caused by pink snow mold. Pink snow mold can be more severe than gray snow mold, as it can kill the crown and roots of grass plants; gray snow mold usually only affects the grass blades.
The best control for snow mold is to lightly rake through the affected areas as the snow melts. For more information on how to prevent and treat snow mold, click here.
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