John from Gulf Coast writes
My St. Augustine has developed a resistance to group 1, 3 and 11 fungicides
Quali-Pro Mefenoxam 2 AQ Fungicide is a Group 4 fungicide that is labeled to target pythium, phytopthora, yellow tuft and downy mildew. This fungicide is not labeled for grey leaf spot. Daconil Ultrex Turf Care Fungicide which uses the active ingredient Chlorathonil (Group M5) is labeled for grey leaf spot on Golf Courses (Tees, Fairways, Greens), Commercial Turf-grass; Ornamental Turf-grass including Sod Farms; Fruit & Nut Tree. This is not for residential lawns.
Answer last updated on: 11/29/2021