There is a product put out by Roundup in a white plastic gallon container with a pump attached called Poison Ivy and Brush Killer. I have used this quite a bit since I am highly allergic to the stuff.

It takes about 3 days to kill the leaves, but be careful of the stems and roots, this carries the nasty oil that makes you itch. I have also taken the liberty to spray the stuff on neighbor's yards if I see it. If it ever gets burned the stuff can get into your lungs requiring hospitalization to control the spread in your body, so I take no chances at all.

Peace,
David