# Brown Spots on the Blades of St. Augustine Grass
St. Augustine is a warm season grass well adapted to growing in shade and high temperatures. The drought-tolerant grass has a medium green color and withstands moderate levels of wear and traffic. A number of diseases lead to the appearance of brown spots on St. Augustine blades.
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Brown Patch
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Brown patch is a fungal disease of St. Augustinegrass. The disease starts with the appearance of irregular shaped, light brown, dark bordered spots on grass blades.
Gray Leaf Spot
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Gray leaf spot disease on St. Augustinegrass is caused by the fungus Pyricularia grisea. The disease is characterized by gray to brown, 2- to 5-cm spots on grass blades. The spots often have a yellow or dark brown border.
Rust
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Rust is a fungal disease common to all turfgrasses and is caused by the Puccinia and Uromyces fungi. The disease starts with yellow, red, orange or brown spots on grass blades.
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