1Aggie99
I recently had about 30 acres of mesquite sprayed with a drone, sprayed with sendero/remedy/high quality surfactant mixed in water. Local feed store (Iola) does this, cost me about $3,300.00.
I will wait until spring to determine how good of kill I got, but early indications have me hopeful it was money well spent. Still gonna have to deal with getting dead trees and bushes, and thorns, taken care of. Wonderful consequence is even goat weeds are dead and not putting back out in areas sprayed. And grass is as thick and green as I've ever seen it in my 66 years on this place, I know we've had advantageous rain but I alao believe part of the grass being so great is that mesquite and goat weeds aren't competing with grass for moisture.
In years past I have grubbed mesquite with a Blue Diamond "stump bucket" on a tractor with great success. Other family members hired a local outfit to come in with skid steer and pincher/grubber and within two to three years it's hard to tell if that $10,000.00 spent was worthwhile. I can't help but think that they weren't as meticulous as I was in making sure I got several feet of tap root on all I pulled/grubbed up myself.
I have personal sprayed diesel and Remedy (3 oz. Remedy per gallon diesel) on bases of mesquite, from knee high to rough bark trunks up to 6" diameter with excellent kill results; but you have to spray completely around the circumference from ground level to at least a bit above the first "V" or crotch, as well as saturate the ground around the base.
If I was physically able, or had the money to hire the labor, my preferred method would be cut and liberally treat the stump with diesel/Remedy mix. I have cut several areas about knee high, gathering the trunks and thorns while green to pile in burn piles while thorns aren't as likely to break off. Immediately spraying the stumps cross section and circumference down to the ground and saturating ground around cut base. Had excellent kill that way to, and can come back in a year or so with front end loader bucket just at or above ground level and push/clear stumps.