Have not read all the posts but I had an old farmer tell me the stuff that stays on the ground is poision ivy....the stuff that climbs trees is poision oak. Dunno if he's right or not but the stuff on the ground, if you get it bad is easily cured by bleach. Just scuff it up a bit and pour it on and no more itch. It works for me every time. The vines on the trees....doesn't work that way for me...bleach won't touch it. I have to get a shot or two (steriods I think). My $.02 is the stuff you get from the vines is 1000% worse than the ground stuff.