Well, it isn't poison ivy but Virginia Creeper that's all over me. It responds to nothing. Dr. says it is a whole lot more intense than PI. And we do have it all over the yard... I've never had anything like this. DH has it too. We have never been into Round Up but I'm thinking we will give it a sporting chance. I just figured it was poison ivy since it is also all over the yard. There was even a vine of PI growing in the living room window. See my blog. If I could I would sew - too much misery. LOL