Ron,
There is a product called "remedy". I will kill any and everything. It will kill the mightest of trees with a single spray. It will kill green briars like putting a torch on a ballon. Very fast and very effective product.
Around here it is a controlled product. Meaning you need a pest control lisence to get it. How ever if you go to a feed store and tell them you have a farm (we do have a farm) they will sell it to you. It is pricey at $100.00 a gallon. But it goes a long, long way.
We had a green briar outbreak here last year. The guy across the street hired chem lawn to kill his and paid $9,000.00 for the treatment. Then he had to replace the grass. I spent $100.00 and a few gallons of diesel fuel and did it myself.
You will need to spray this on a windless day or not at all. Dilute it with diesel fuel at a rate of 4 oz of Remedy to one gallon of diesel fuel, not water. The reason you use diesel instead of water is the fuel will take the waxy buildup off the plant and the Remedy will do it stuff. If the plant has no waxy covering it will clean the plants surface.
This really works but please be advised it will kill EVERYTHING in the yard. I had a stream willow tree that I really didn't care for. To see if this stuff really works I sprayed ONE LEAF on the tree. It died.
Talk to the guys at the feed store around there they are a wealth of information.
