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Dollar Spot

The name comes from the silver-dollar sized straw-colored spots this disease causes on putting greens. On longer grass, the shapes are more irregular.

When dew is on the grass, look for a white, cob-webby fungus. Blades of grass show straw-colored lesions with reddish-brown borders. Of the common lawn grasses, bluegrass and fescues are most affected.

Prevention includes:

  • Proper mowing. Maintain maximum height, if possible, and take off no more than a third of the height when mowing.
  • Maintaining adequate moisture without overwatering. Minimize leaf wetness by watering early in the day.
  • Avoiding excess nitrogen. Dollar spot occurs less on nitrogen-deficient turf.
  • Choosing resistant varieties.