dicamba (Rifle or Clarity)
Rate 2 to 4 lb ae/A
Remarks Reported to control this plant, although data are lacking in the Pacific Northwest. Follow label instructions.
Site of action Group 4: synthetic auxin
Chemical family Benzoic acid
clopyralid (Stinger or Transline) or glyphosate or MCPA (various products) or picloram (Tordon) or 2,4-D (various trade names)
Remarks Reported to control this plant, although data are lacking in the Pacific Northwest. Follow label instructions.
Site of action (clopyralid, MCPA, 2,4-D, and picloram) Group 4: synthetic auxin; (glyphosate) Group 9: inhibits EPSP synthase
Chemical family (clopyralid and picloram) pyridine; (glyphosate) none generally accepted; (MCPA and 2,4-D) phenoxy acetic acid
imazapyr (Arsenal)
Rate 1 lb ae/A
Remarks Reported to control this plant, although data are lacking in the Pacific Northwest. Follow label instructions.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Imidazolinone