QuickSilver T&O Herbicide 0.169 fl.oz. Carfentrazone-ethyl 12% Selective Weed Killer Provides ultra-fast weed control Visible results in just 24 hours Effective in both cool and warm climates. Tough on broadleaf weeds Gentle on Bermudagrass & St. Augustinegrass, even in newly seeded, sodded or sprigged areas.