Certainty Herbicide for Turf and Lawns 1.25 oz In "cool" season turf, Certainty Turf Herbicide will control broadleaves, sedges and Poa trivialis. In "warm" season turf, Certainty Turf Herbicide will control broadleaves, sedges and kyllinga. Certainty Turf Herbicide is easy and flexible to use and has excellent control of both purple and yellow nutsedge. Combined with a non-ionic surfactant, Certainty Turf Herbicide attacks nutsedge through broadcast applications or spot treatments. Active Ingredient: Sulfosulfuron