ALLIGARE Agri Star Triclopyr 4E Herbicide, 1 Gallon, Liquid concentrate, Clear/transparent liquid

Yep. I futzed around for a few years with physical removal techniques, wasted God knows how many days of sweat equity, hired tree crews to cut parts of it away. Spent lots of $$, nothing worked. I finally gave in and went the herbicide route. I had such a big infestation, I opted for industrial sized, high end triclopyr concentrate: https://www.amazon.com/dp/B004S70RK4?ref=nb_sb_ss_w_as-reorder_k0_1_8&=&crid=1ZFG8F7VH0P7I&=&sprefix=triclpoy For me, triclopyr was the breakthrough. My yard is now 100% bittersweet free. I even volunteered to remove the bittersweet from my abutting neighbor's yard, partly because I'm a good neighbor, and partly because the larger the bittersweet-free zone is around my yard, the better.