Paul from Sherrill, Iowa writes
Using this for a broadcast spray on a cool season lawn. I have already put down a pre-emergent, but some crabgrass already exists in the lawn.
You could potentially mix SpeedZone Herbicide with a quinclorac product to broaden the spectrum of weed control. Something to keep in mind, though, is that most quinclorac products require the addition of a methylated seed oil (MSO) surfactant to help cut through the waxy coating on the target plants for best results. Adding this kind of 2-way surfactant with SpeedZone could increase sensitivity on your desirable turfgrass. We recommend first performing a small jar test for compatability, and then treating a small area with this tank mix for tolerance before mixing a large batch and/or treating the entire area.
Answer last updated on: 04/08/2019
