Another good one is triox. It think it is ortho brand. It is a total vegitation killer for use on driveways or where you are going to pave, etc. They warn up and down to not spray it over the roots of trees 'cause it'll kill 'em. If you have grass in the area it will kill that too, as it is a total vegitation killer. If you can't spray over the roots then drill into the stump and pour some in and it will croak it. Be careful with this stuff and follow all directions because it is pretty nasty stuff. Also, don't use the sprayer for anything except herbicide in the future b/c the residue could kill other plants.