Weed Management Handbook

Remarks Although PNW data are preliminary, aminocyclopyrachlor, aminopyralid, glyphosate, imazapyr, and triclopyr + 2,4-D applied as cut stem treatments gave promising results in initial trials. Imazapyr and triclopyr + 2,4-D applied to foliage also resulted in good control.

Site of action (imazapyr) Group 2: acetolactate synthase (ALS) inhibitor; (glyphosate) Group 9: inhibits EPSP synthase; (2,4-D, aminocyclopyrachlor, aminopyralid, triclopyr) Group 4: synthetic auxin

Remarks Control is unknown. In a preliminary trial, fluazifop and sethoxydim showed some activity, but did not substantially reduce stands.

Site of action (fluazifop, sethoxydim) Group 1: acetyl CoA carboxylase (ACCase) inhibitors

Chemical family (fluazifop) Aryloxyphenoxy propionate; (sethoxydim) Cyclohexanedione

Remarks Although PNW data are preliminary, initial results indicate that glyphosate, imazamox, imazapyr, and aminopyralid may provide effective garden loosestrife control.

Site of action (imazapyr, imazamox) Group 2: acetolactate synthase (ALS) inhibitor; (glyphosate) Group 9: inhibits EPSP synthase; (aminopyralid) Group 4: synthetic auxin

Remarks Although PNW data are lacking, isoxaben, metsulfuron, and 2,4-D + MCPP + dicamba are used for control in the Southeastern US.

Site of action (metsulfuron) Group 2: acetolactate synthase (ALS) inhibitor; (glyphosate) Group 9: inhibits EPSP synthase; (picloram) Group 4: synthetic auxin

Chemical family (metsulfuron) sulfonylurea; (glyphosate) none generally accepted; (picloram) phenoxy acetic acid

Remarks Although PNW data are lacking, clopyralid, fosamine, glyphosate, imazapyr, metsulfuron, picloram, sulfometuron, and triclopyr are used for control of kudzu in the Southeastern US.

Site of action (imazapyr, metsulfuron, sulfometuron) Group 2: acetolactate synthase (ALS) inhibitor; (glyphosate) Group 9: inhibits EPSP synthase; (clopyralid, picloram, triclopyr) Group 4: synthetic auxin; (fosamine) Group 26, unknown

aminocyclopyrachlor + chlorsulfuron (Perspective)

Rate 4.75 to 8 oz/A

Time Apply either preemergence or postemergence. Postemergence applications are most effective on seedlings.

Remarks Adjuvants can be used; these include methylated seed oils 0.5 to 1% v/v, nonionic surfactants at 0.25 to 1% v/v, and crop oil concentrates at 1%v/v.

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

Remarks Although PNW data are lacking, cut stem applications with glyphosate, triclopyr, or imazapyr will likely be effective.

Site of action (imazapyr) Group 2: acetolactate synthase (ALS) inhibitor; (glyphosate) Group 9: inhibits EPSP synthase; (triclopyr) Group 4: synthetic auxin

Chemical family (imazapyr) imidazolinone; (glyphosate) none generally accepted; (triclopyr) pyridine

2,4-D amine or LV ester

Rate 1.9 lb ae/A (2 quarts/A)

Time Apply in early to midsummer when plants are in bud stage to full flower stage of growth.

Remarks 2,4-D is usually not able to fully control goatsrue, so combining with other products is generally recommended. Retreatment will likely be necessary.

Remarks Although PNW data are preliminary, glufosinate, glyphosate, imazapic, imazapyr, metsulfuron, sulfometuron, and triclopyr + 2,4-D gave promising results in initial trials.

Site of action (imazapyr, imazapic, metsulfuron, sulfometuron) Group 2: acetolactate synthase (ALS) inhibitor; (glyphosate) Group 9: inhibits EPSP synthase; (triclopyr, 2,4-D) Group 4, synthetic auxin; Group 10: glutamine synthase inhibitor