Yesterday after returning home from the seminar it was time to engage in some chemical warfare.
At the local hardware store, following some helpful suggestions from my commenters, I purchased this:
After carefully reading the directions I donned jeans, boots and long sleeves and got to work.
There's even more poison Ivy than I thought, with multiple separate patches in addition to the huge and very visible patch I had found before.
There's also some that is as tall as the fence and I found it in more than just one spot.
All of it received a solid treatment of Roundup, note the newly wet leaves.
The directions state it will take more treatments and likely up to 4 weeks before it gets the ivy killed off, so we'll see how it goes.