I am new to industrial vegetation but have done my homework. Now for some questions I am still uncertain about. For example, I do not want to deal with the leaching possibilities of diuron, sahara. I do need a good residual kill. The local supplier said I could use gallery for residual with roundup for an initial kill. At $132 per pound per acre, plus Roundup costs, this is quite pricey. Any experience with gallery? Any suggestions for residual effect without the leaching? I need to spray over 3 miles of fencerow, plus nearly a mile of gravel drives and some parking areas. My understanding is for total kill with residual effect you need organic matter to hold the chemical. Gravel roads/parking lots are not going to allow this. Suggestions?