INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT TALL WATERHEMP
(Amaranthus tuberculatus (=A. rudis))


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Canada, Ontario
INTRODUCTION TALL WATERHEMP
Tall Waterhemp (Amaranthus tuberculatus (=A. rudis)) is a dicot weed in the Amaranthaceae family.  In Ontario this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2002 and infests Soybean.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to imazethapyr and they may be cross-resistant to other Group 2 (Legacy B) 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.


QUIK STATS (last updated Oct 23, 2008 )

Common NameTall Waterhemp
SpeciesAmaranthus tuberculatus (=A. rudis)
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesimazethapyr
LocationCanada, Ontario
Year2002
Situation(s)Soybean
Contributors - (Alphabetically)Francois Tardif 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory 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 HRAC Group 2 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

Studies on the mechanism of resistance of Group 2 (Legacy B) resistant Tall Waterhemp from Ontario indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 2 (Legacy B) resistant Tall Waterhemp from Ontario please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

FRANCOIS TARDIF
Associate Professor
University Of Guelph
Department Of Plant Agriculture
2055 Radatz Ave
Guelph, N1G 2W1, Ontario
Canada
Email Francois Tardif
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Ontario have been instrumental in providing you this information. Particular thanks is given to Francois Tardif 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
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5212
2 Canada (Ontario) CanadaOntario2002 Soybean imazethapyr 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5213
3 Canada (Ontario) CanadaOntario2014 Soybean glyphosate, and imazethapyr 7 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp9940
4 Canada (Ontario) CanadaOntario2017 Corn (maize), and Soybean atrazine, glyphosate, imazethapyr, and lactofen 7 Multiple Resistance: 4 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp17140
5 Canada (Ontario) CanadaOntario2017 Corn (maize), and Soybean atrazine, glyphosate, and imazethapyr 7 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp17141
6 Canada (Ontario) CanadaOntario2017 Corn (maize), and Soybean atrazine, glyphosate, and metribuzin 7 Multiple Resistance: 2 Sites of Action
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp17142
7 Canada (Ontario) CanadaOntario2021 Corn (maize), Dry, bean, edible, and Soybean atrazine, glyphosate, imazethapyr, lactofen, mesotrione, and metribuzin 7 Multiple Resistance: 5 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ( HRAC Group 27 (Legacy F2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp24242
8 IsraelIsrael 2019 Corn (maize), Cotton, and Sunflower foramsulfuron, pyrithiobac-sodium, and trifloxysulfuron-Na 23 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp18207
9 United States (Iowa) United StatesIowa1993 Corn (maize), and Soybean imazethapyr 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp239
10 United States (Illinois) United StatesIllinois1993 Corn (maize), and Soybean chlorimuron-ethyl, imazethapyr, and thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5183
11 United States (Missouri) United StatesMissouri1994 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1066
12 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 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1083
13 United States (Minnesota) United StatesMinnesota1994 Soybean imazethapyr, and thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7802
14 United States (Kansas) United StatesKansas1995 Alfalfa, Corn (maize), Sorghum, and Soybean imazethapyr, and thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp333
15 United States (Kansas) United StatesKansas1995 Corn (maize), and Sorghum atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1038
16 United States (Nebraska) United StatesNebraska1996 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp525
17 United States (Iowa) United StatesIowa1996 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1061
18 United States (Ohio) United StatesOhio1996 Soybean chlorimuron-ethyl, imazethapyr, and thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1087
19 United States (Illinois) United StatesIllinois1996 Corn (maize), Cropland, and Soybean atrazine, flumetsulam, imazethapyr, and thifensulfuron-methyl 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1127
20 United States (Wisconsin) United StatesWisconsin1999 Soybean imazethapyr 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5090
21 United States (Michigan) United StatesMichigan2000 Soybean chlorimuron-ethyl, imazethapyr, and thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5179
22 United States (Kansas) United StatesKansas2001 Soybean acifluorfen, chlorimuron-ethyl, fomesafen, imazethapyr, lactofen, and thifensulfuron-methyl 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5112
23 United States (Illinois) United StatesIllinois2001 Corn (maize) atrazine, and cyanazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5182
24 United States (Oklahoma) United StatesOklahoma2002 Corn (maize), and Soybean chlorimuron-ethyl, imazaquin, imazethapyr, nicosulfuron, and primisulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5156
25 United States (Illinois) United StatesIllinois2002 Corn (maize), Cropland, and Soybean acifluorfen, atrazine, fomesafen, imazamox, lactofen, and thifensulfuron-methyl 45 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5171
26 United States (Missouri) United StatesMissouri2005 Corn (maize), and Soybean acifluorfen, cloransulam-methyl, fomesafen, glyphosate, imazamox, imazethapyr, and lactofen 45 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5269
27 United States (Indiana) United StatesIndiana2005 Soybean chlorimuron-ethyl, cloransulam-methyl, imazaquin, and imazethapyr 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5521
28 United States (Kansas) United StatesKansas2006 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5307
29 United States (Illinois) United StatesIllinois2006 Corn (maize), and Soybean chlorimuron-ethyl, glyphosate, and imazethapyr 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5311
30 United States (Texas) United StatesTexas2006 Corn (maize), Cotton, and Sorghum glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7776
31 United States (Tennessee) United StatesTennessee2007 Soybean cloransulam-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5314
32 United States (Minnesota) United StatesMinnesota2007 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5334
33 United States (Minnesota) United StatesMinnesota2007 Soybean glyphosate, imazapyr, and thifensulfuron-methyl 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7803
34 United States (Ohio) United StatesOhio2008 Corn (maize), and Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5697
35 United States (Iowa) United StatesIowa2009 Soybean lactofen 45 Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5460
36 United States (Iowa) United StatesIowa2009 Corn (maize), and Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5461
37 United States (Iowa) United StatesIowa2009 Seed corn atrazine, mesotrione, rimsulfuron, tembotrione, thifensulfuron-methyl, and topramezone 45 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ( HRAC Group 27 (Legacy F2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5490
38 United States (Illinois) United StatesIllinois2009 Seed corn atrazine, chlorimuron-ethyl, imazethapyr, mesotrione, tembotrione, and topramezone 45 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ( HRAC Group 27 (Legacy F2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5491
39 United States (Indiana) United StatesIndiana2009 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5518
40 United States (Nebraska) United StatesNebraska2009 Pastures 2,4-D, aminopyralid, atrazine, chlorimuron-ethyl, imazethapyr, and picloram 45 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Auxin Mimics ( HRAC Group 4 (Legacy O)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5574
41 United States (Missouri) United StatesMissouri2009 Corn (maize), Cotton, and Soybean chlorimuron-ethyl, cloransulam-methyl, and glyphosate 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7807
42 United States (Illinois) United StatesIllinois2009 Corn (maize), and Soybean atrazine, chlorimuron-ethyl, glyphosate, imazethapyr, and lactofen 45 Multiple Resistance: 4 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7864
43 United States (Mississippi) United StatesMississippi2010 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5485
44 United States (North Dakota) United StatesNorth Dakota2010 Corn (maize), Soybean, and Sugar beets glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5575
45 United States (South Dakota) United StatesSouth Dakota2010 Corn (maize), and Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5633
46 United States (Kentucky) United StatesKentucky2010 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7881
47 United States (Mississippi) United StatesMississippi2010 Soybean imazethapyr, pyrithiobac-sodium, and trifloxysulfuron-Na 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp16080
48 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
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ( HRAC Group 27 (Legacy F2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5576
49 United States (Nebraska) United StatesNebraska2011 Corn (maize) mesotrione, tembotrione, and topramezone 45 Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ( HRAC Group 27 (Legacy F2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5582
50 United States (Oklahoma) United StatesOklahoma2011 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5593
51 United States (Tennessee) United StatesTennessee2011 Cotton, and Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5595
52 United States (Nebraska) United StatesNebraska2012 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5737
53 United States (Wisconsin) United StatesWisconsin2013 Corn (maize), and Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp10958
54 United States (Indiana) United StatesIndiana2014 Soybean fomesafen 45 Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp8919
55 United States (Minnesota) United StatesMinnesota2014 Soybean fomesafen 45 Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp11004
56 United States (Arkansas) United StatesArkansas2015 Cotton, and Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp10980
57 United States (Louisiana) United StatesLouisiana2015 Cotton, and Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp11005
58 United States (Minnesota) United StatesMinnesota2016 Corn (maize), and Soybean fomesafen, glyphosate, and lactofen 45 Multiple Resistance: 2 Sites of Action
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp13056
59 United States (Illinois) United StatesIllinois2016 Corn (maize), and Soybean 2,4-D, acifluorfen, atrazine, chlorimuron-ethyl, dicamba, fomesafen, imazethapyr, lactofen, mesotrione, tembotrione, and topramezone 45 Multiple Resistance: 5 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ( HRAC Group 27 (Legacy F2)
Auxin Mimics ( HRAC Group 4 (Legacy O)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp14051
60 United States (Wisconsin) United StatesWisconsin2016 Soybean fomesafen, glyphosate, and lactofen 45 Multiple Resistance: 2 Sites of Action
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp16100
61 United States (Nebraska) United StatesNebraska2016 Soybean acifluorfen, atrazine, chlorimuron-ethyl, fomesafen, glyphosate, imazethapyr, and lactofen 45 Multiple Resistance: 4 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp17121
62 United States (Illinois) United StatesIllinois2016 Corn (maize), and Soybean acetochlor, dimethenamid, pyroxasulfone, and S-metolachlor 45 Very Long-Chain Fatty Acid Synthesis inhibitors ( HRAC Group 15 (Legacy K3 N)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp18152
63 United States (North Carolina) United StatesNorth Carolina2020 Soybean atrazine, fomesafen, glyphosate, imazethapyr, and mesotrione 45 Multiple Resistance: 5 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ( HRAC Group 27 (Legacy F2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp19222
64 United States (Iowa) United StatesIowa2021 Soybean dicamba 45 Auxin Mimics ( HRAC Group 4 (Legacy O)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp27263
65 United States (Idaho) United StatesIdaho2023 Sugar beets glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp27264
66 UruguayUruguay 2022 Corn (maize), and Soybean glyphosate 73 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp24245
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