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PP-204: Gray Leaf Spot of St. Augustinegrass: Cultural and Chemical Management Options

Figure 1. Leaf spot symptoms of gray leaf spot are shown on a St. Augustinegrass leaf blade. The gray coloration in the center of the lesions is a flush of spores produced after incubation at 100% relative humidity for 24 hours. Rapidly expanding lesions will sometimes have an olive green, water-soaked border.

Credit: Phil Harmon