Turf > Irregular patches > Spots on leaves
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Credit: M. Grabowski
Credit: Bob Mugaas
Credit: Unknown
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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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Credit: K. Snover-Clift PDIS copyright 
Credit: Bob Mugaas
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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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Credit: M. Grabowski
Credit: M. Grabowski
Credit: M. Grabowski
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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
