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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.
Post emergent herbicides can be selective or non-selective, used to kill existing weeds. Products such as Eraser (Roundup, QuickPro) can be considered non selective and post emergent. A non-selective herbicide tries to kill most plants.Selective herbicides are designed to kill specific types of plants, usually grasses or broad leaf weeds. Trimec (for example) recognizes broad-leaf weeds and ignores grasses.TIP: When spraying herbicides on plants, a surfactant can be used to increase the efficiency of herbicides.roducts such as Eraser (Roundup, QuickPro) can be considered non selective and post emergent. A non-selective herbicide tries to kill most plants. Selective herbicides are designed to kill specific types of plants, usually grasses or broad leaf weeds.