Field bindweed control in Safflower

I have tried Tryclopyr in bindweed with some success, although this cannot be used in crop with safflower but as a post harvest. I have had the most success with a successive passes of roundup with a concentration of 1 gal/ac. I use a Weed-it spot sprayer to make this economical and there is no soil residual. I've heard Quinclorac works on bindweed, but I haven't tried it yet. (Again, this would not be and in-crop treatment)