Dollar Spot - Cool Season Grass

Fertilize regularly with Milorganite to avoid straw-colored patches from Dollar Spot.

 

Grass varieties affected

  • Bluegrass
  • Ryegrass

Disease occurrence

  • Late-March through early-November

Symptoms

  • Straw-colored patches 2 to 6 inches in diameter.
  • Hourglass-shaped lesions with reddish-brown margins will develop across the leaf blade.
  • The branching mycelium of dollar spot fungus looks like spider webs or cobwebs on morning grass, but unlike spider webs, dollar spot mycelium disappears when the dew dries.

Management

  • Opposite conditions encourage dollar spot to develop: drought soils and prolonged wet foliage. Address both by watering deeply and infrequently early in the day to allow the leaf blades to dry off and not remain wet for long periods of time.
  • Fertilize regularly to help turf overcome the disease.
  • Mow unaffected areas first and diseased areas last to avoid infecting healthy lawn.
  • Collect and dispose of grass clippings in the garbage when dollar spot is present.
  • To avoid spreading the fungus, after mowing, clean the mower blades by rising with water and drying with a cloth.

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Fertilize regularly with Milorganite to avoid straw-colored patches from Dollar Spot.