Remarks Although PNW data are preliminary, aminopyralid, clopyralid, glyphosate, imazapyr, and triclopyr + 2,4-D applied as cut stem treatments gave promising results in initial trials. Foliar application of clopyralid also resulted in excellent control.
Site of action (imazapyr) Group 2: acetolactate synthase (ALS) inhibitor; (glyphosate) Group 9: inhibits EPSP synthase; (2,4-D, aminopyralid, clopyralid, triclopyr) Group 4: synthetic auxin
Chemical family (imazapyr) imidazolinone; (glyphosate) none generally accepted; (2,4-D) phenoxy acetic acid; (aminopyralid, clopyralid, triclopyr) pyridine