I realize most folks on this forum like Wisteria, but I don't. My neighbors vine has invaded my whole yard, I cant get access to where most of the roots are, so can't dig the suckers up. I cut canes as much as possible, but this seems to promote more growth. How can I positively KILL this pest. I tried Roundup (Put leaves in a plastic bag with roundup solution)...it acted like a fertilizer.