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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.
Starting in February, put out a granular pre-emergent, we recommend Balan 2.5G. The pre-emergent must be applied every 3 months thereafter. Balan will provide season long control of the sticker burs before they come up. Balan will also control crabgrass and many other types of grassy weeds.