Oooh so sorry!!!!! Awful stuff. To ID later... Spray paint pink after the herbicide dries? Take pics? Put a little sign for yourself back there, to remind? Have someone else do it? Pull sprouts more often? Not everything in nature makes sense, but this cruel trick of still poisonous dead leaves and vines is especially perplexing to me. The only acceptable disposal for me, this yard, is plastic bag sent to landfill. We recycle and compost, but that's not an option for something that has the potential to make me so sick for an unknown amount of time past its' death. Do not burn, urishiol can become airborne this way.

Those are all poison ivy. And big healthy established vines by the look of those blooms! What a job! If it were me, i'd don heavy duty protective gear in 2-3 layers(preferably an outer layer you can toss afterwards), and start cutting away as much as i could while it's dormant and fairly easy to work around. That won't kill it- but when it reprouts at the ground where you cut it off you can hit that with roundup and not damage other stuff. If someone in your family is more resistant to the oils, let them tackle the job. When you're cutting big vines especially, do it slowly so it doesn't splash/squirt sap around. Probably a good idea to wipe down your pruners as they get wet, too. Not sure how 'juicy' it'll be this time of year- i know at other times, the big vines are pretty sappy. It's going to be awfully hard to spray it thoroughly and not get anything else if you don't trim some of it down. You're taking some of the plant's system and weakening it some by trimming. Plus, it takes more spray if you leave it as it is than if you trim. Best of luck! As others have said- be very careful, and wash with technu really well afterwards. If you do end up with a rash, zanafel works pretty well at reducing the time you have it (it's expensive, though). There are a couple of prescription creams that will help tremendously in drying it up as well, and they aren't commonly known. The steroids and shots do work, but i don't like dealing with either one. The dormant vines can still give you a whopper of a rash, and the sap is the worst. If it were me, and this rental had it before you moved in, i'd ask the landlord if they'd knock off a little rent or pay for the weed killers for you. It's a nasty job, and you should get some compensation.

Yes, Poison Ivy can develop large leaves... I've looked at all of the photos that you have posted on photobucket and all of the photos show a large poison ivy vine... Be careful... Ron

All forms and parts of poison ivy, dead or alive, are poisonous. Very difficult to eradicate. Early every spring I get a can of white spray paint and spray every plant I can find. It won’t kill it but at least I know it’s there and avoid it like the plague! A couple times each season (not before a wedding or photo shoot!) I glove up with rubber gloves, long pants and sleeves. I use a gallon plastic baggie over my gloved hand and carefully rip as much out as the bag will hold. Don’t forget the roots and runners. I invert the baggie over the plant and toss in a yard bag. If I’m persistent the plant will eventually weaken. I don’t use weed killer because if it is unrecognizable then I can’t tell it’s there. It is still poisonous dead or alive!