I have poison ivy too. This is how I got in trouble at Permies. com. My plan for dealing with poison ivy is to wear combat gear. Cut the ivy off at the base, and paint it with glyphosate. This would use only a minimal amount of weed killer by applying it with a paint brush directly to the cambium (growth layer) inside the bark of the plant. This does work, but its a lot of trouble if you have poison ivy by the half acre like I do. Another method that is a lot of trouble is to cut off as much ivy as possible and cover it thoroughly with cardboard. Do this after a rain so the soil is wet deeply. This method doesn't need any glyphosate. Just make sure you have several layers of cardboard. Another method similar to the first is to cut the ivy about 3 ft long. gather up the root ends and stuff them in a gallon milk jug containing glyphosate. These methods would circumvent most of the damaging effects of glyphosate, and they use only a small amount of the product (Here the price of Round Up is about $100 dollars for a 2 g container.).
Be aware that the ivy sets seeds in the fall. The plants should be treated, before they have a chance to grow a new crop from bird planted seeds. And use long rubber gloves that you plan t throw away when the job is done.
