Scotts Turf Builder Halts crabgrass preventer has a somewhat awkward name that would suggest it's primarily a pre-emergent treatment for crabgrass. But its active ingredient, pendimethalin ...
The best weapon you have against this annual weed is crabgrass preemergence herbicide (also called crabgrass preventer ... Sta-Green’s Crab-Ex Plus and Scotts Turf Builder.