Here is an approved Special Local Need Registration (SLN) for Colt AS Herbicide, EPA Reg. No. 34704-1019 for control of weeds in grasses grown for forage or hay in Idaho, manufactured by Loveland Products, Inc, SLN #ID-130010.
Idaho Dept of Agriculture Letter
Colt AS Herbicide EPA Reg. No. 34704-1019
Roger Batt
Pacific Seed Association