I have been fighting it a few years. Sprayed some fields this past week. I use gly and 2-4db for clover fields. The problem comes in with how long it's been there. The seed bank from what I read can last for like 60 years (how do they know that?). I do know I can kill every bit of it, have it gone for a year, but as soon as I put a disc in the ground, it's right back.