You have apparently never experienced the effects of intimate contact with Rhus toxicodendron. Poison ivy is one mean plant and I for one wouldn't miss it if it went extinct. Same goes for poison oak and poison sumac. Stick to business where you understand the dangers; let farmers and homeowners kill all the poison ivy they can in their own self interests, and biodiversity be damned.

I like the blue dye idea; I may have to try that one. The stump killer I use, Tordon, has a blue color in it, so I guess I'd choose another color, but I like the idea. Thanks!