We don't have much poison ivy around here but we do have bindweed, and the only moderately effective way I have found to deal with it is to take the concentrated glyphosate and dilute it to about half strength and fill up a big can or other container. Ball up the bindweed and shove it in the container and place a concrete paver on top. As the plant sucks up the chemical it will begin to die. It is important to dilute it so it gets through the vascular system before killing it.

I don't use it on things I can pull up with moderate work. But the bindweed is different. I'd use napalm if I could.