What is the best fungicide for Grayleaf spot on St. Aug?

Both, the active ingredients in bioadvanced fungus control (propiconazole) and Scott’s Diease EX (azoxystrobin) are effective fungicides for gray leaf spot. But fungal diseases routinely come back when environmental conditions are suitable.

Just be sure you are applying at the recommended labeled rates and frequency of re-applications as stated on the containers’s label (directions).

Obviously, maintain a healthy lawn to the best of your ability, don’t over-fertilize particularly with nitrogen (like adding gasoline to a fire), cut grass at recommended height, etc.

Gray Leaf Spot - LSU AgCenter