International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
MULTIPLE RESISTANT TALL WATERHEMP
(Amaranthus tuberculatus (=A. rudis))


Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)

United States, Nebraska
INTRODUCTION TALL WATERHEMP
Tall Waterhemp (Amaranthus tuberculatus (=A. rudis)) is a dicot weed in the Amaranthaceae family.  In Nebraska this weed first evolved multiple resistance (to 4 herbicide sites of action) in 2016 and infests Soybean.  Multiple resistance has evolved to herbicides in the Groups B/2, C1/5, E/14, and G/9.  These particular biotypes are known to have resistance to acifluorfen-sodium, atrazine, chlorimuron-ethyl, fomesafen, glyphosate, imazethapyr, and lactofen and they may be cross-resistant to other herbicides in the Groups B/2, C1/5, E/14, and G/9.

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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Feb 05, 2018 )

Common NameTall Waterhemp
SpeciesAmaranthus tuberculatus (=A. rudis)
GroupALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
Herbicidesacifluorfen-sodium, atrazine, chlorimuron-ethyl, fomesafen, glyphosate, imazethapyr, and lactofen
LocationUnited States, Nebraska
Year2016
Situation(s)Soybean
Contributors - (Alphabetically)Amit Jhala, and Debalin Sarangi 
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ACADEMIC ASPECTS

Confirmation Tests

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 Group B, C1, E, G/2, 5, 14, 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

Triazine resistant weeds often exhibit a lower relative fitness when compared to susceptible biotypes.  The most common mutation conferring triazine resistance (Ser 264 to Gly mutation of the psbA gene) also causes a reduction in CO2 fixation, quantum yield, and seed and biomass production.  There is no record in this database referring specifically to fitness studies on multiple resistant Tall Waterhemp from Nebraska.
 
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CONTRIBUTING WEED SCIENTISTS

AMIT JHALA
Assistant Professor (Weed Science)
University of Nebraska-Lincoln
Agronomy and Horticulture
279, Plant Sci. Hall
Lincoln, 68583, Nebraska
United States
Email Amit Jhala
Web   : Web Site Link
DEBALIN SARANGI
Postdoctoral Research Associate
University of Nebraska- Lincoln
Agronomy and Horticulture
279 Plant Science Hall
University of Nebraska- Lincoln (East campus)
Lincoln, 68583-0915, Nebraska
United States
Email Debalin Sarangi
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Nebraska have been instrumental in providing you this information. Particular thanks is given to Amit Jhala, and Debalin Sarangi 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 Canada (Ontario) CanadaOntario2017 Corn (maize), and Soybean atrazine, glyphosate, imazethapyr, and lactofen 7 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 Waterhemp17140
5 Canada (Ontario) CanadaOntario2017 Corn (maize), and Soybean atrazine, glyphosate, and imazethapyr 7 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp17141
6 Canada (Ontario) CanadaOntario2017 Corn (maize), and Soybean atrazine, and glyphosate 7 Multiple Resistance: 2 Sites of Action
Photosystem II inhibitors (C1/5)
EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp17142
7 United States (Iowa) United StatesIowa1993 Corn (maize), and Soybean imazethapyr 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp239
8 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
9 United States (Missouri) United StatesMissouri1994 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1066
10 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
11 United States (Minnesota) United StatesMinnesota1994 Soybean imazethapyr, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7802
12 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
13 United States (Kansas) United StatesKansas1995 Corn (maize), and Sorghum atrazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1038
14 United States (Nebraska) United StatesNebraska1996 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp525
15 United States (Iowa) United StatesIowa1996 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1061
16 United States (Ohio) United StatesOhio1996 Soybean chlorimuron-ethyl, imazethapyr, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp1087
17 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
18 United States (Wisconsin) United StatesWisconsin1999 Soybean imazethapyr 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5090
19 United States (Michigan) United StatesMichigan2000 Soybean chlorimuron-ethyl, imazethapyr, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5179
20 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
21 United States (Illinois) United StatesIllinois2001 Corn (maize) atrazine, and cyanazine 45 Photosystem II inhibitors (C1/5)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5182
22 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
23 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
24 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
25 United States (Indiana) United StatesIndiana2005 Soybean chlorimuron-ethyl, cloransulam-methyl, imazaquin, and imazethapyr 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5521
26 United States (Kansas) United StatesKansas2006 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5307
27 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
28 United States (Texas) United StatesTexas2006 Corn (maize), Cotton, and Sorghum glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7776
29 United States (Tennessee) United StatesTennessee2007 Soybean cloransulam-methyl 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5314
30 United States (Minnesota) United StatesMinnesota2007 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5334
31 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
32 United States (Ohio) United StatesOhio2008 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5697
33 United States (Iowa) United StatesIowa2009 Soybean lactofen 45 PPO inhibitors (E/14)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5460
34 United States (Iowa) United StatesIowa2009 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5461
35 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
36 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
37 United States (Indiana) United StatesIndiana2009 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5518
38 United States (Nebraska) United StatesNebraska2009 Pastures 2,4-D, aminopyralid, atrazine, chlorimuron-ethyl, imazethapyr, and picloram 45 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
Synthetic Auxins (O/4)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5574
39 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
40 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
41 United States (Mississippi) United StatesMississippi2010 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5485
42 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
43 United States (South Dakota) United StatesSouth Dakota2010 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5633
44 United States (Kentucky) United StatesKentucky2010 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp7881
45 United States (Mississippi) United StatesMississippi2010 Soybean imazethapyr, pyrithiobac-sodium, and trifloxysulfuron-sodium 45 ALS inhibitors (B/2)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp16080
46 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
47 United States (Nebraska) United StatesNebraska2011 Corn (maize) mesotrione, tembotrione, and topramezone 45 HPPD inhibitors (F2/27)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5582
48 United States (Oklahoma) United StatesOklahoma2011 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5593
49 United States (Tennessee) United StatesTennessee2011 Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5595
50 United States (Nebraska) United StatesNebraska2012 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp5737
51 United States (Wisconsin) United StatesWisconsin2013 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp10958
52 United States (Indiana) United StatesIndiana2014 Soybean fomesafen 45 PPO inhibitors (E/14)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp8919
53 United States (Minnesota) United StatesMinnesota2014 Soybean fomesafen 45 PPO inhibitors (E/14)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp11004
54 United States (Arkansas) United StatesArkansas2015 Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp10980
55 United States (Louisiana) United StatesLouisiana2015 Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
219Amaranthus tuberculatus (=A. rudis)Tall Waterhemp11005
56 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
57 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
58 United States (Wisconsin) United StatesWisconsin2016 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 Waterhemp16100
59 United States (Nebraska) United StatesNebraska2016 Soybean acifluorfen-sodium, atrazine, chlorimuron-ethyl, fomesafen, 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 Waterhemp17121
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, November 15, 2018 .  Available  www.weedscience.org
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