Rust - Warm Season Grass

These small yellow specks on grass disappear after proper fertilization.

 

Grass species affected

  • St. Augustinegrass
  • Zoysiagrass
  • Rust may be observed on perennial ryegrass used to overseed lawns during the winter months.

Disease occurrence

  • May through October
  • Rust typically occurs due to nitrogen deficiency.
  • Rust typically develops due to nitrogen deficiency and during times of drought.

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 shoes and mowers.

Management

  • Maintain a regular fertilization schedule.
  • 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.
  • 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.

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hese small yellow specks on grass disappear after proper fertilization.