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 hr. Rapidly expanding lesions will sometimes have an olive green water-soaked border.
Credit: Phil Harmon
