Rust - Cool Season Grass

These small yellow specks on grass disappear after proper fertilization.

 

Grass species affected

  • Bluegrass
  • Ryegrass
  • Tall Fescue

Disease occurrence

  • Summer through early-fall
  • Rust develops during times of drought and as a result of poor fertility.

Symptoms

  • Small, yellow specks on leaf blades and stems that develop orange or red pustules.
  • Heavily infected lawns may have an orange or reddish hue and may begin to thin out.
  • The “rust” will be visible on mowers and shoes.

Management

  • Maintain a regular fertilization schedule, as rust typically occurs as a result of nitrogen deficiency.
  • Mow unaffected areas first and diseased areas last to avoid infecting healthy lawn.
  • Collect and dispose of grass clippings in the garbage when rust is present.
  • To avoid spreading the fungus, after mowing, clean the mower blades by rising with water and drying with a cloth.
  • Water deeply and infrequently early in the day to allow the leaf blades to dry off and not remain wet for long periods of time.

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These small yellow specks on grass disappear after proper fertilization.