tomf wrote:Cut the stalks at the bottom and it will not die but the upper parts will. Better do not cut them and use a combination of Crossbow and Round up. Mix them both together at full strength for each then add some mineral oil or soap to help them stick about a table spoon or 2 per gallon. Spray as much of the plant as you can. No killing the tree will not kill the poison ivy.
You only have the right to trim branches that are over your land. But you may ask if you can have the tree removed. I would also ask before spraying unless you do not care about good relations, I can understand that with poison ivy growing.
My garden for 20 years had poison ivy growing in the back. Every year I would cut off the vines and put them into plastic trash bags. I would put poison on the roots, but they did not die. It was growing out of the mortar on my stone house even after I chopped off the roots and dug them up. The one time I did not cover my arms I got exposed and developed the worse pi rash ever and had to get a shot from the doctor.
Good luck - poison ivy is tough to get rid of.