International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP G/9 RESISTANT TALL WATERHEMP
(Amaranthus tuberculatus (=A. rudis))


EPSP synthase inhibitors (G/9)

United States, Minnesota
INTRODUCTION TALL WATERHEMP
Tall Waterhemp (Amaranthus tuberculatus (=A. rudis)) is a dicot weed in the Amaranthaceae family.  In United States this weed first evolved resistance to Group G/9 herbicides in 2007 and infests Soybean.   Group G/9 herbicides are known as EPSP synthase inhibitors (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group G/9 herbicides.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Dec 24, 2010 )

Common NameTall Waterhemp
SpeciesAmaranthus tuberculatus (=A. rudis)
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationUnited States
Year2007
Situation(s)Soybean
Contributors - (Alphabetically)Jeffrey Gunsolus, and Jeff Stachler 
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Tall Waterhemp biotype with this Tall Waterhemp biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.
 
Genetics

Genetic studies on Group G/9 resistant Tall Waterhemp have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
 
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
 
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group G/9 resistant Tall Waterhemp from United States please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JEFFREY GUNSOLUS
Professor and Extension Weed Scientist
University Of Minnesota
Department of Agronomy and Plant Genetics
411 Borlaug Hall
1991 Upper Buford Circle
St. Paul, 55108, Minnesota
United States
Email Jeffrey Gunsolus
Web   : Web Site Link
JEFF STACHLER
Extension Agronomist - Sugarbeet/weed Science
North Dakota State University, University of Minnesota
Plant Sciences
Loftsgard Hall 474E NDSU Dept #7670
PO Box 6050
Fargo, 58108-6050, North Dakota
United States
Email Jeff Stachler
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in United States have been instrumental in providing you this information. Particular thanks is given to Jeffrey Gunsolus, and Jeff Stachler for providing detailed information.
Herbicide Resistant Tall Waterhemp Globally
(Amaranthus tuberculatus (=A. rudis))
Herbicide Resistant Tall Waterhemp Globally
(Amaranthus tuberculatus (=A. rudis))
Drag a column header and drop it here to group by that column
Herbicide Resistant Tall Waterhemp Globally
(Amaranthus tuberculatus (=A. rudis))
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario2002 Soybean atrazine, and imazethapyr 7 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5212
2 Canada (Ontario) CanadaOntario2002 Soybean imazethapyr 7 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5213
3 Canada (Ontario) CanadaOntario2014 Soybean glyphosate, and imazethapyr 7 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp9940
4 United States (Iowa) United StatesIowa1993 Corn (maize), and Soybean imazethapyr 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp239
5 United States (Illinois) United StatesIllinois1993 Corn (maize), and Soybean chlorimuron-ethyl, imazethapyr, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5183
6 United States (Missouri) United StatesMissouri1994 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1066
7 United States (Missouri) United StatesMissouri1994 Corn (maize), Cotton, and Soybean chlorimuron-ethyl, flumetsulam, halosulfuron-methyl, imazamox, imazaquin, imazethapyr, nicosulfuron, primisulfuron-methyl, prosulfuron, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1083
8 United States (Minnesota) United StatesMinnesota1994 Soybean imazethapyr, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7802
9 United States (Kansas) United StatesKansas1995 Alfalfa, Corn (maize), Sorghum, and Soybean imazethapyr, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp333
10 United States (Kansas) United StatesKansas1995 Corn (maize), and Sorghum atrazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1038
11 United States (Nebraska) United StatesNebraska1996 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp525
12 United States (Iowa) United StatesIowa1996 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1061
13 United States (Ohio) United StatesOhio1996 Soybean chlorimuron-ethyl, imazethapyr, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1087
14 United States (Illinois) United StatesIllinois1996 Corn (maize), Cropland, and Soybean atrazine, flumetsulam, imazethapyr, and thifensulfuron-methyl 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1127
15 United States (Wisconsin) United StatesWisconsin1999 Soybean imazethapyr 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5090
16 United States (Michigan) United StatesMichigan2000 Soybean chlorimuron-ethyl, imazethapyr, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5179
17 United States (Kansas) United StatesKansas2001 Soybean acifluorfen-sodium, chlorimuron-ethyl, fomesafen, imazethapyr, lactofen, and thifensulfuron-methyl 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5112
18 United States (Illinois) United StatesIllinois2001 Corn (maize) atrazine, and cyanazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5182
19 United States (Oklahoma) United StatesOklahoma2002 Corn (maize), and Soybean chlorimuron-ethyl, imazaquin, imazethapyr, nicosulfuron, and primisulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5156
20 United States (Illinois) United StatesIllinois2002 Corn (maize), Cropland, and Soybean acifluorfen-sodium, atrazine, fomesafen, imazamox, lactofen, and thifensulfuron-methyl 45 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5171
21 United States (Missouri) United StatesMissouri2005 Corn (maize), and Soybean acifluorfen-sodium, cloransulam-methyl, fomesafen, glyphosate, imazamox, imazethapyr, and lactofen 45 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5269
22 United States (Indiana) United StatesIndiana2005 Soybean chlorimuron-ethyl, cloransulam-methyl, imazaquin, and imazethapyr 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5521
23 United States (Kansas) United StatesKansas2006 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5307
24 United States (Illinois) United StatesIllinois2006 Corn (maize), and Soybean chlorimuron-ethyl, glyphosate, and imazethapyr 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5311
25 United States (Texas) United StatesTexas2006 Corn (maize), Cotton, and Sorghum glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7776
26 United States (Tennessee) United StatesTennessee2007 Soybean cloransulam-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5314
27 United States (Minnesota) United StatesMinnesota2007 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5334
28 United States (Minnesota) United StatesMinnesota2007 Soybean glyphosate, imazapyr, and thifensulfuron-methyl 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7803
29 United States (Ohio) United StatesOhio2008 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5697
30 United States (Iowa) United StatesIowa2009 Soybean lactofen 45 PPO inhibitors (E/14)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5460
31 United States (Iowa) United StatesIowa2009 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5461
32 United States (Iowa) United StatesIowa2009 Seed corn atrazine, mesotrione, rimsulfuron, tembotrione, thifensulfuron-methyl, and topramezone 45 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
HPPD inhibitors (F2/27)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5490
33 United States (Illinois) United StatesIllinois2009 Seed corn atrazine, chlorimuron-ethyl, imazethapyr, mesotrione, tembotrione, and topramezone 45 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
HPPD inhibitors (F2/27)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5491
34 United States (Indiana) United StatesIndiana2009 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5518
35 United States (Nebraska) United StatesNebraska2009 Pastures 2,4-D 45 Synthetic Auxins (O/4)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5574
36 United States (Missouri) United StatesMissouri2009 Corn (maize), Cotton, and Soybean chlorimuron-ethyl, cloransulam-methyl, and glyphosate 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7807
37 United States (Illinois) United StatesIllinois2009 Corn (maize), and Soybean atrazine, chlorimuron-ethyl, glyphosate, imazethapyr, and lactofen 45 Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7864
38 United States (Mississippi) United StatesMississippi2010 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5485
39 United States (North Dakota) United StatesNorth Dakota2010 Corn (maize), Soybean, and Sugar beets glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5575
40 United States (South Dakota) United StatesSouth Dakota2010 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5633
41 United States (Kentucky) United StatesKentucky2010 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7881
42 United States (Iowa) United StatesIowa2011 Corn (maize), and Soybean atrazine, chlorimuron-ethyl, glyphosate, imazamethabenz-methyl, isoxaflutole, mesotrione, and thifensulfuron-methyl 45 Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
HPPD inhibitors (F2/27)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5576
43 United States (Nebraska) United StatesNebraska2011 Corn (maize) mesotrione, tembotrione, and topramezone 45 HPPD inhibitors (F2/27)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5582
44 United States (Oklahoma) United StatesOklahoma2011 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5593
45 United States (Tennessee) United StatesTennessee2011 Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5595
46 United States (Nebraska) United StatesNebraska2012 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5737
47 United States (Wisconsin) United StatesWisconsin2013 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp10958
48 United States (Indiana) United StatesIndiana2014 Soybean fomesafen 45 PPO inhibitors (E/14)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp8919
49 United States (Minnesota) United StatesMinnesota2014 Soybean fomesafen 45 PPO inhibitors (E/14)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp11004
50 United States (Arkansas) United StatesArkansas2015 Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp10980
51 United States (Louisiana) United StatesLouisiana2015 Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp11005
52 United States (Minnesota) United StatesMinnesota2016 Corn (maize), and Soybean fomesafen, glyphosate, and lactofen 45 Multiple Resistance: 2 Sites of Action
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp13056
53 United States (Illinois) United StatesIllinois2016 Corn (maize), and Soybean 2,4-D, acifluorfen-sodium, atrazine, chlorimuron-ethyl, fomesafen, imazethapyr, lactofen, mesotrione, tembotrione, and topramezone 45 Multiple Resistance: 5 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
HPPD inhibitors (F2/27)
Synthetic Auxins (O/4)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp14051
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