I live in Iowa and recently found this growing under some grape vines on my back fence. I have started to spray it with an equivalent of Round-Up (a local product). The leaves are begining to curl. I am one of those people who is terribly allergic to poison ivy. At least 2 medical visits in the past 2 years were due to the stuff (i.e., serious blisters, infection, fever, etc.). Thanks for any help!