Rusts – Various Species

Symptoms:

  • Light yellow flecks initially on the leaf blades and sheaths.
  • Flecks enlarge, elongate, and turn yellow in color.
  • Infected areas rise above the epidermis and then rupture, releasing spores that are yellowish-orange to reddish-orange in color.
  • Leaf blades turn yellow, starting at the tip and progressing to the base sheath.
  • Severe disease infection can cause the shoot to turn yellowish to reddish-brown in color and slow in growth.
  • Turf may appear thin as individual shoots die.

Conditions Favoring Disease:

  • Typically occur in early spring through fall, depending on the location of the turf.
  • Favors low-light areas.
  • Depending on the species, rusts favor temperatures between 65F and 86F.
  • Severe rusts infections occur on slow-growing turfgrass, particularly those with low nitrogen levels and/or plant water stress.
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