Remarks Although PNW data are preliminary, metsulfuron, sulfometuron, glyphosate, aminocyclopyrachlor, and imazapyr appear promising in initial trials.
Site of action (metsulfuron, sulfometuron, imazapyr) Group 2: acetolactate synthase (ALS) inhibitor; (glyphosate) Group 9: inhibits EPSP synthase; (aminocyclopyrachlor) Group 4: synthetic auxin
Chemical family (metsulfuron, sulfometuron) sulfonylurea; (imazapyr) imidazolinone; (glyphosate) none generally accepted; (aminocyclopyrachlor) pyridine