Need some feedback on the control of Ailanthus altissima (Tree-of-Heaven) which as everyone knows is not an actual plant but a cancer. I have several trees busting out a retaining wall over a swimming pool that I need to kill. I'm planning to apply Garlon 3A in basal oil or diesel fuel (2.5 quarts per 3 gallon mix) with a penetrant. I've heard that Pathfinder II and Arsenal AC are good choices for basal treatments as well. Anyone have experience with either of these chemicals? If you've ever dealt with Ailanthus you know what a bugger it is to control.