MCPA (several trade names)
Rate 0.5 lbs ai/a (1 pint/a of 4 lb formulations)
Time Apply in late fall after first frost when alfalfa is dormant and temperatures are above 40°F.
Remarks Foliar application in winter to control winter annual broadleaf weeds. Selectivity depends on complete dormancy of alfalfa.
Site of action Group 4: synthetic auxin
Chemical family Phenoxy acetic acid