Gray Leaf Spot on St. Augustinegrass

Joey Williamson,
Home & Garden Information Center

Gray leaf spot is a fungal disease (caused by Pyricularia grisea) that occurs most commonly on St. Augustinegrass (Stenotaphrum secundatum), but occasionally may also be found infecting tall fescue, bermudagrass, centipedegrass and ryegrass in home lawns. On St. Augustinegrass the initial leaf spots are small and brown, but they expand rapidly into large, oval or elongate, tan to gray leaf spots, which are surrounded by purple or brown borders. A yellow halo may surround some of the spots, or a general leaf yellowing may occur.

For More Information see HGIC 2151 Gray Leaf Spot on St. Augustinegrass.

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