As a teenager in the '70's, I helped my dad clear some land in the country for a house. We camped out there for the weekend. Giant 4-inch diameter vines were choking the large pecan trees. We'd pry a section of vine away from the trunk, and I would hold it away from the trunk by hand while my Dad chain-sawed out a section so the vines above would die.
Poison Ivy
Poison Oak
Poison Sumac
Information about poison ivy, oak, sumac and the skin rashes they cause