I've started spraying the crap out of it in the last month or so in a heavily wooded area (20 year growth). Seems like it just appeared and then took over in a few years. I really hate that spraying is killing a lot of natives as well.
I've really nerded out on all this stuff after snagging 60 acres of what I'd consider some of the best hunting in Hamilton County. I know it's not a huge piece but I've dreamed of hunting this place since I was a kid. In few months I'll be 41 and it's a became a dream come true.
I have been spraying every week as soon as I can tell where I left off before. I think I can get rid of it in about five years.I sprayed some of it this weekend.