Should be fine watered down. I think recommended is 6 oz per gallon. I have to use 8 oz per gallon to really kill some of the brush at my house. Hasn't hurt any of the trees yet.
10,000 comedians out of work, and you're trying to be funny. :glare:
They need better material.
Seriously, it's not my field of expertise and I don't want to give you bad information. I would use herbicides to get rid of it.
Poison ivy and poison oak does not react well with me. I actually have scar tissue from really bad cases.