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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Turf > Irregular patches > Spots on leaves

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Turf > Irregular patches > Spots on leaves

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  • Image: Rust 1
  • Image: Rust 2
  • Image: Rust 3

Rust
Puccinia sp. or Uromyces sp.

  • Infected lawn area looks thin and tinted orange or brown
  • Powdery orange dust like spores can be seen on light colored shoes after walking through an infected lawn
  • Raised orange or yellow spots or bumps on the grass blade
  • Powdery orange or yellow dust-like spores easily rub off leaf spots and can be seen on a white tissue
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  • Image: leaf spot 1
  • Image: leaf spot 2

Leaf Spot and Melting Out
Dreschlera sp. and Bipolaris sp.

  • Infected grass looks thin and weak
  • Irregular small patches of dead grass throughout the infected area
  • Spots on leaves, stems and rhizomes
  • Spots vary in size and color and may be reddish-brown, purplish-black, black and may or may not have a light colored center
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  • Image: dollar spot 1
  • Image: dollar spot 2
  • Image: dollar spot 3

Dollar Spot
Sclerotinia homeocarpa

  • Randomly scattered tan to gray round dead patches, 2 to 6 inches wide
  • Cobweb like fungal growth on infected grass blades during cool wet periods like early morning
  • Leaf blades have dry, tan sections with a rusty-brown border, early leaf infections may be a dry, tan oval with a rusty brown border
  • Many small patches may grow together to create larger areas of thin, tan grass

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