Have killed hundreds of Locust on our property in Montague County & here on our farm in Oak Point and will offer my opinion as to how to get rid of them. Had some that were 60-80' tall growing right next to Red oaks, so trunk sprayed them with Remedy/diesel at 25%Remedy with pump-up sprayer. I was very very careful not to get any on desirable trees. With this method there was some root sprouting the next year that required respraying.I found the Remedy/Reclaim leaf application for smaller Locust to be unreliable. Surmount is a fairly new product that has worked really well as a leaf application with essentially no regrowth(2 years). It needs to be used with a particular surfactant(Inergy). Locust are a lot like Mesquite in that you really never get done spraying, but the job gets easier every year..