Cockatrice6420
Songster
BONIDE products it works but you must keep treating Ortho is the best like SC said I use the brush killer but only to cut stem to afraid Ben will eat it .be careful whatever you use .
Have you tried warm white vinegar? The temp outside has to be 70 or higher and cut stems are preferred, but it'll knock out blackberry brambles to the root and isn't toxic to other folks.
I probably know more about the Internet then you do old man 
