Don from Nc writes
Q4 Plus Turf Herbicide is not labeled to control or suppress bahiagrass but states not to apply to it as injury can occur. It is also not labeled to control dallisgrass. Please review our How to Get Rid of Dallisgrass Treatment Guide for information on eradicating this weed in your turf species.
Unfortunately we do not carry a product that would kill bahia grass in cool season turf. Your best option for this type would be to spot treat the bahia with a non selective like RoundUP and reseed/sod the desirable turfgrass
For warm season turfgrass you can use something like MSM Turf Herbicide.
Answer last updated on: 07/19/2023