I bought some Roundup Poison Ivy killer, not just Roundup! I just got the "ready-to-use" bottle and misted the whole "tree"....all ten feet of it! on my side of the fence and then let myself into my neighbors' yard (they're away) and did the same on their side. I'm interested to see what happens with this monster plant, and will let you all know in a day or so!
Patty