I think it would require killing the Algerian Ivy to do that--and that may end up being the solution. The bed is about 50 ft by 10 ft and to paint the poison ivy with Round Up would be about like trying to paint every third blade of grass in a lawn. Several years ago I had read on a forum that you could use weed-and-feed formula on an ivy bed in late winter before the ivy had emerged but once I decided to try to get rid of the ivy in this bed I couldn't find the posting any more.

I just want to give an update on my poison ivy. After due deliberation and much consideration I decided I could carefully target just the poison ivy leaves with an Ortho poison ivy killer without it getting into the ground. I began with a small area first and waited to see what would happen. At first I thought perhaps it had no effect at all, but then a few weeks later I noticed that tiny patch I'd sprayed was brown and dead. So I sprayed the rest. It took a lot of patience and a couple of rounds to get it all and is a slow process just as daninthedirt said, but it looks as though it has finally succeeded! So my next step will be removing that patch of dirt and hopefully removing any roots with it and then bring in some fresh dirt. I figure that's the best way to assure I'm removing as much poison residue in the soil as possible. I'll wait awhile before doing this step to give the poison a chance to complete its job on that root system. I, of course did these courses of poison during long stretches of dry weather so it didn't wash off the leaves. Next time this problem arises I'm going to try the vinegar recipe method for comparison. Thanks for all the help and good advice!

My feeling is the same as Smivies, though I have seen climbing PI here and I have seen vines other than PI with aerial roots. Though a bit out of focus, the smaller vines look more like Virginia creeper/Parthenocissus quinquefolia. Be aware that some folks react to Virginia creeper as well as to PI, so treat both with respect. Once leaves emerge, you can repost to get a firm ID.

Thinking poison ivy. https://www.prismhealthadvocates.com/truths-myths-poison-ivy-poison-oak-poison-sumac/