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Snow Mold

Fusarium Patch and Typhula Blight

Winter snow cover can be hard on our lawns, leaving unexpected damage like snow mold. When the snow finally melts, we look forward to seeing our lawns again. Finding patches of rusty pink edged circles or grayish-white spots is never a nice surprise.

Pink Snow Mold

Also known as fusarium patch, it first begins as small yellowish-green spots that can grow out from 6 to 12 inches in diameter. The patches eventually take on a pink coloring along the edges.

If it appears after the snow melts in the spring, it's likely fusarium. It loves cool, wet weather, and long periods of cold temperatures make it worse.

Gray Mold

Also known as typhula blight, it first shows up like fusarium patch as yellowish-green spots. They can become as large as 2 feet in diameter and grow together becoming large infected areas. As these patches increase they take on a grayish-white coloring.

Grass Blades

The infected grass blades of both types will become matted turning a light tan color. The gray mold blades have raised spots on leathery blades.

Controls and Prevention

  • Increase air circulation with a lawn aeration.
  • Rake affected areas and apply organic fertilizer to encourage new growth.
  • Increase sun exposure to the infected areas.
  • Minimize thatch build up with a lawn dethatching.
  • Correct improper drainage.
  • Use slow-release nitrogen fertilizer to avoid late lush growth in fall.
  • Avoid longer grass with a good, short grass mowing in fall.
  • Apply special grass fungicide in the fall.
  • Avoid shoveling snow into piles along lawn edges of driveways and walkways. Remember, it grows under the snow cover.

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