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Active Ingredient. Quinclorac 75 DF Herbicide (Crabgrass Killer) Quinclorac 75 DF Herbicide is comparable to Drive XLR8 and is the best crabgrass killer available. Quinclorac is a post emergent crabgrass control product meaning you can spray it on actively growing crabgrass to stop growth and eventually kill it.
Pre-emergent Herbicides for Crabgrass Prevention in Lawns. Pre-emergent herbicides are most effective at controlling annual grassy weeds like crabgrass, foxtail, goose grass, and barnyard grass. Fair control of annual broadleaf weeds such as purslane, spurge, and oxalis can be expected from most pre-emergents.