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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.
Alexander grass. Selectively controlling grassy weeds, once they are established (especially in St. Augustine grass lawns), is nearly impossible. Applications of pre-emergent herbicides in fall and winter, before the weeds emerge, helps prevent weed establishment.