International Survey of Herbicide-Resistant Weeds

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Status of Herbicide Resistance in Minnesota - Jeffrey Gunsolus : January, 2014

Multiple resistance to SOA# 2 and 9 are of greatest concern, especially in soybean as it limits the set of effective herbicides and increases selection intensity on my next resistance concern - SOA#14. Liberty Link technology for soybean has been a big disappointment to me as we never seem to be able to get sound genetics and an ample supply of glufosinate at the same place and time. Hence SOA#10 has not been a player To exacerbate this problem in soybean, the regions in west central and northwest MN that have sugar beet in the rotation lose even more herbicide options due to the long crop rotation restrictions associated with SOA #2.   Jeff Stachler's map highlights the weeds of concern and if I were to list them in rank order of concern as a function of their noted adaptability and acres influenced I would rate as follows:

Herbicide Resistant Weeds in Minnesota, United States.
#YearSpeciesSite of ActionActivesContacts
1 246Common Lambsquarters1982Chenopodium album
Common Lambsquarters		United States
(Minnesota)		MinnesotaMN PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Jeffrey Gunsolus
2 247Wild Oat1991Avena fatua
Wild Oat		United States
(Minnesota)		MinnesotaMN Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) diclofop-methyl Jeffrey Gunsolus
3 244Velvetleaf1991Abutilon theophrasti
Velvetleaf		United States
(Minnesota)		MinnesotaMN PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Jeffrey Gunsolus
4 245Redroot Pigweed1991Amaranthus retroflexus
Redroot Pigweed		United States
(Minnesota)		MinnesotaMN PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Jeffrey Gunsolus
5 7802Tall Waterhemp1994Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Minnesota)		Minnesota  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr, thifensulfuron-methyl Jeffrey Gunsolus
6 248Kochia1994Kochia scoparia
Kochia		United States
(Minnesota)		MinnesotaMN Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr, thifensulfuron-methyl, tribenuron-methyl Jeffrey Gunsolus
7 249Common cocklebur1994Xanthium strumarium
Common cocklebur		United States
(Minnesota)		MinnesotaMN Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr Jeffrey Gunsolus
8 503Giant Foxtail1996Setaria faberi
Giant Foxtail		United States
(Minnesota)		MinnesotaMN Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr, nicosulfuron, primisulfuron-methyl Jeffrey Gunsolus
9 504Giant Green Foxtail1996Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)
Giant Green Foxtail		United States
(Minnesota)		MinnesotaMN Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr, nicosulfuron, primisulfuron-methyl Jeffrey Gunsolus
10 506Yellow Foxtail1997Setaria pumila (=S. glauca)
Yellow Foxtail		United States
(Minnesota)		MinnesotaMN Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr Jeffrey Gunsolus
11 1116Common Ragweed1998Ambrosia artemisiifolia
Common Ragweed		United States
(Minnesota)		MinnesotaMN Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) cloransulam-methyl, imazethapyr, primisulfuron-methyl Terry Wright, Paul Schmitzer
12 5167Giant Green Foxtail1999Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)
Giant Green Foxtail		United States
(Minnesota)		Minnesota  Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) fenoxaprop-ethyl, fluazifop-butyl Jeffrey Gunsolus
13 5168Giant Green Foxtail1999Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)
Giant Green Foxtail		United States
(Minnesota)		Minnesota  Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) fenoxaprop-ethyl, fluazifop-butyl, sethoxydim Jeffrey Gunsolus
14 5333Giant Ragweed2006Ambrosia trifida
Giant Ragweed		United States
(Minnesota)		Minnesota  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Jeffrey Gunsolus, Jeff Stachler
15 5334Tall Waterhemp2007Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Minnesota)		Minnesota  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Jeffrey Gunsolus, Jeff Stachler
16 7803Tall Waterhemp2007Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Minnesota)		Minnesota  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) 		glyphosate, imazapyr, thifensulfuron-methyl Jeffrey Gunsolus, Jeff Stachler
17 5506Common Ragweed2008Ambrosia artemisiifolia
Common Ragweed		United States
(Minnesota)		Minnesota  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Jeffrey Gunsolus, Mike Christoffers, Jeff Stachler
18 5508Giant Ragweed2008Ambrosia trifida
Giant Ragweed		United States
(Minnesota)		Minnesota  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) 		cloransulam-methyl, glyphosate Jeffrey Gunsolus, Jeff Stachler
19 7801Common Ragweed2010Ambrosia artemisiifolia
Common Ragweed		United States
(Minnesota)		Minnesota  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) 		cloransulam-methyl, glyphosate, imazapyr Jeffrey Gunsolus, Mike Christoffers, Jeff Stachler
20 11004Tall Waterhemp2014Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Minnesota)		Minnesota  Inhibition of Protoporphyrinogen Oxidase (E/14) Inhibition of Protoporphyrinogen Oxidase (E/14) fomesafen Jeffrey Gunsolus
21 13056Tall Waterhemp2016Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp		United States
(Minnesota)		Minnesota  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), Inhibition of Protoporphyrinogen Oxidase (E/14) Multiple Resistance: 2 Sites of Action
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
Inhibition of Protoporphyrinogen Oxidase (E/14) 		fomesafen, glyphosate, lactofen Jeffrey Gunsolus
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