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 Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Jeffrey Gunsolus
2 247Wild Oat1991Avena fatua
Wild Oat
United States
(Minnesota)
MinnesotaMN ACCase inhibitors (A/1) ACCase inhibitors (A/1) diclofop-methyl Jeffrey Gunsolus
3 244Velvetleaf1991Abutilon theophrasti
Velvetleaf
United States
(Minnesota)
MinnesotaMN Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Jeffrey Gunsolus
4 245Redroot Pigweed1991Amaranthus retroflexus
Redroot Pigweed
United States
(Minnesota)
MinnesotaMN Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Jeffrey Gunsolus
5 7802Tall Waterhemp1994Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Minnesota)
Minnesota  ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, thifensulfuron-methyl Jeffrey Gunsolus
6 248Kochia1994Kochia scoparia
Kochia
United States
(Minnesota)
MinnesotaMN ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, thifensulfuron-methyl, tribenuron-methyl Jeffrey Gunsolus
7 249Common cocklebur1994Xanthium strumarium
Common cocklebur
United States
(Minnesota)
MinnesotaMN ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr Jeffrey Gunsolus
8 503Giant Foxtail1996Setaria faberi
Giant Foxtail
United States
(Minnesota)
MinnesotaMN ALS inhibitors (B/2) ALS inhibitors (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 ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, nicosulfuron, primisulfuron-methyl Jeffrey Gunsolus
10 506Yellow Foxtail1997Setaria pumila (=S. glauca)
Yellow Foxtail
United States
(Minnesota)
MinnesotaMN ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr Jeffrey Gunsolus
11 1116Common Ragweed1998Ambrosia artemisiifolia
Common Ragweed
United States
(Minnesota)
MinnesotaMN ALS inhibitors (B/2) ALS inhibitors (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  ACCase inhibitors (A/1) ACCase inhibitors (A/1) fenoxaprop-P-ethyl, fluazifop-P-butyl Jeffrey Gunsolus
13 5168Giant Green Foxtail1999Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)
Giant Green Foxtail
United States
(Minnesota)
Minnesota  ACCase inhibitors (A/1) ACCase inhibitors (A/1) fenoxaprop-P-ethyl, fluazifop-P-butyl, sethoxydim Jeffrey Gunsolus
14 5333Giant Ragweed2006Ambrosia trifida
Giant Ragweed
United States
(Minnesota)
Minnesota  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Jeffrey Gunsolus, Jeff Stachler
15 5334Tall Waterhemp2007Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Minnesota)
Minnesota  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Jeffrey Gunsolus, Jeff Stachler
16 7803Tall Waterhemp2007Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Minnesota)
Minnesota  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
glyphosate, imazapyr, thifensulfuron-methyl Jeffrey Gunsolus, Jeff Stachler
17 5506Common Ragweed2008Ambrosia artemisiifolia
Common Ragweed
United States
(Minnesota)
Minnesota  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Jeffrey Gunsolus, Mike Christoffers, Jeff Stachler
18 5508Giant Ragweed2008Ambrosia trifida
Giant Ragweed
United States
(Minnesota)
Minnesota  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
cloransulam-methyl, glyphosate Jeffrey Gunsolus, Jeff Stachler
19 7801Common Ragweed2010Ambrosia artemisiifolia
Common Ragweed
United States
(Minnesota)
Minnesota  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
cloransulam-methyl, glyphosate, imazapyr Jeffrey Gunsolus, Mike Christoffers, Jeff Stachler
20 11004Tall Waterhemp2014Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Minnesota)
Minnesota  PPO inhibitors (E/14) PPO inhibitors (E/14) fomesafen Jeffrey Gunsolus
21 13056Tall Waterhemp2016Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
United States
(Minnesota)
Minnesota  EPSP synthase inhibitors (G/9), PPO inhibitors (E/14) Multiple Resistance: 2 Sites of Action
EPSP synthase inhibitors (G/9)
PPO inhibitors (E/14)
fomesafen, glyphosate, lactofen Jeffrey Gunsolus
Contributing Weed Scientists
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, October 19, 2019 .  Available  www.weedscience.org
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