Legumes and Herbicides
Eptam and Treflan are labeled for preplant-incorporated use in establishing alfalfa. Roundup and Gramoxone Extra are labeled for preplant or preemergence weed control. Several postemergence herbicides are labeled for broadleaf weed control in alfalfa including 2,4-DB, bromoxynil, and Pursuit. Poast, Select, and Pursuit are labeled for grass control in alfalfa. See herbicide labels and the ND Weed Control Guide for details. No herbicides are cleared for use on sweetclover.
For more information see the Weed Control Guide at http://www.ag.ndsu.nodak.edu/weeds/w253/w253w.htm