Blueweed, Texas (Helianthus ciliaris)

dicamba (Banvel, 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