International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
Most Recent Cases of Herbicide Resistant Weeds Entered into the Database
(click on a column header to sort or click on a country for details)
#Date Last UpdatedSpeciesCountryFirst YearSite of Action
1 September 21, 2016Amaranthus palmeriUnited States (Illinois) United StatesIllinois201645 Multiple Resistance: 2 Sites of Action
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth13050
2 September 19, 2016Digitaria insularisArgentinaArgentina 201448 EPSP synthase inhibitors (G/9)
239Sourgrass13049
3 August 28, 2016Amaranthus palmeriUnited States (Nebraska) United StatesNebraska201445 Multiple Resistance: 2 Sites of Action
Photosystem II inhibitors (C1/5)
HPPD inhibitors (F2/27)
14Palmer Amaranth13048
4 September 2, 2016Amaranthus palmeriUnited States (Nebraska) United StatesNebraska201645 Multiple Resistance: 2 Sites of Action
Photosystem II inhibitors (C1/5)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth13047
5 August 22, 2016Oryza sativa var. sylvaticaUnited States (Arkansas) United StatesArkansas200245 ALS inhibitors (B/2)
242Red Rice13046
6 August 19, 2016Conyza bonariensisAustralia (New South Wales ) AustraliaNew South Wales 20161 PSI Electron Diverter (D/22)
60Hairy Fleabane13045
7 August 3, 2016Lolium perenne ssp. multiflorumUnited States (California) United StatesCalifornia201545 Glutamine synthase inhibitors (H/10)
110Italian Ryegrass13044
8 July 19, 2016Digitaria insularisBrazilBrazil 20165 ACCase inhibitors (A/1)
239Sourgrass13043
9 July 19, 2016Amaranthus palmeriBrazilBrazil 20165 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth13042
10 July 14, 2016Amaranthus palmeriUnited States (California) United StatesCalifornia201545 EPSP synthase inhibitors (G/9)
14Palmer Amaranth13041
11 July 4, 2016Cyperus iriaBrazilBrazil 20145 ALS inhibitors (B/2)
266Rice Flatsedge13040
12 June 28, 2016Eleusine indicaBrazilBrazil 20165 EPSP synthase inhibitors (G/9)
81Goosegrass13039
13 May 24, 2016Amaranthus palmeriArgentinaArgentina 201548 EPSP synthase inhibitors (G/9)
14Palmer Amaranth13038
14 May 11, 2016Amaranthus palmeriUnited States (Tennessee) United StatesTennessee201545 Multiple Resistance: 2 Sites of Action
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth13037
15 May 3, 2016Ambrosia artemisiifoliaUnited States (North Carolina) United StatesNorth Carolina201545 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
18Common Ragweed13036
16 May 2, 2016Chamaesyce maculataUnited States (Georgia) United StatesGeorgia201445 ALS inhibitors (B/2)
332Spotted Spurge13035
17 April 27, 2016Eleusine indicaIndonesiaIndonesia 201222 PSI Electron Diverter (D/22)
81Goosegrass13034
18 April 26, 2016Amaranthus retroflexusBrazilBrazil 20145 PPO inhibitors (E/14)
16Redroot Pigweed13033
19 April 18, 2016Echium plantagineumBrazilBrazil 20155 ALS inhibitors (B/2)
186Patersons Curse12033
20 March 3, 2016Salsola tragusUnited States (Montana) United StatesMontana201545 EPSP synthase inhibitors (G/9)
147Russian-thistle12032
21 February 25, 2016Avena fatuaCanada (Manitoba) CanadaManitoba20157 Multiple Resistance: 5 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
PPO inhibitors (E/14)
Long chain fatty acid inhibitors (K3/15)
Lipid Inhibitors (N/8)
28Wild Oat11033
22 February 25, 2016Kochia scopariaCanada (Saskatchewan) CanadaSaskatchewan20157 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
101Kochia11032
23 February 8, 2016Lolium rigidumAustralia (New South Wales ) AustraliaNew South Wales 20151 Lipid Inhibitors (N/8)
112Rigid Ryegrass11031
24 February 6, 2016Vulpia bromoidesAustralia (Western Australia) AustraliaWestern Australia20141 Photosystem II inhibitors (C1/5)
173Squirreltail Fescue11030
25 February 8, 2016Gamochaeta pensylvanicaAustralia (Queensland) AustraliaQueensland20151 PSI Electron Diverter (D/22)
298Pennsylvania Everlasting11029
26 February 8, 2016Chloris virgataAustralia (South Australia) AustraliaSouth Australia20151 EPSP synthase inhibitors (G/9)
330Feather Fingergrass11028
27 February 8, 2016Chloris virgataAustralia (Queensland) AustraliaQueensland20151 EPSP synthase inhibitors (G/9)
330Feather Fingergrass11027
28 February 8, 2016Chloris virgataAustralia (New South Wales ) AustraliaNew South Wales 20151 EPSP synthase inhibitors (G/9)
330Feather Fingergrass11026
29 February 8, 2016Solanum nigrumAustralia (Queensland) AustraliaQueensland20151 PSI Electron Diverter (D/22)
162Black Nightshade11025
30 February 8, 2016Eleusine indicaAustralia (Queensland) AustraliaQueensland20151 PSI Electron Diverter (D/22)
81Goosegrass11024
31 February 6, 2016Lolium rigidumAustralia (Victoria) AustraliaVictoria20151 Lipid Inhibitors (N/8)
112Rigid Ryegrass11023
32 February 8, 2016Lactuca serriolaAustralia (Victoria) AustraliaVictoria20151 EPSP synthase inhibitors (G/9)
102Prickly Lettuce11022
33 February 8, 2016Chloris truncataAustralia (Victoria) AustraliaVictoria20151 EPSP synthase inhibitors (G/9)
262Windmill Grass11021
34 April 27, 2016Eleusine indicaIndonesiaIndonesia 201222 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
81Goosegrass11020
35 February 4, 2016Alopecurus aequalisJapanJapan 200625 ALS inhibitors (B/2)
264Shortawn Foxtail11019
36 February 4, 2016Alopecurus aequalisJapanJapan 200525 Microtubule inhibitors (K1/3)
264Shortawn Foxtail11018
37 February 4, 2016Atriplex patulaBelgiumBelgium 20153 Photosystem II inhibitors (C1/5)
26Halberdleaf Orach11017
38 February 2, 2016Echinochloa crus-galli var. crus-galliSpainSpain 201538 ALS inhibitors (B/2)
79Barnyardgrass11016
39 February 1, 2016Cyperus iriaVenezuelaVenezuela 201580 ALS inhibitors (B/2)
266Rice Flatsedge11015
40 February 1, 2016Alopecurus myosuroidesSpainSpain 201538 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
PSII inhibitor (Ureas and amides) (C2/7)
6Blackgrass11014
41 January 20, 2016Chenopodium albumFinlandFinland 2015139 ALS inhibitors (B/2)
47Common Lambsquarters11013
42 January 14, 2016Cyperus compressusUnited States (Alabama) United StatesAlabama201545 ALS inhibitors (B/2)
329Annual Sedge11012
43 January 10, 2016Conyza canadensisUnited States (Montana) United StatesMontana201545 EPSP synthase inhibitors (G/9)
61Horseweed11011
44 December 20, 2015Digitaria sanguinalisFranceFrance 201517 ALS inhibitors (B/2)
77Large Crabgrass11010
45 December 20, 2015Amaranthus palmeriBrazilBrazil 20155 EPSP synthase inhibitors (G/9)
14Palmer Amaranth11009
46 October 4, 2015Hirschfeldia incanaArgentinaArgentina 201348 ALS inhibitors (B/2)
328Shortpod Mustard11008
47 September 13, 2015Lolium perenne ssp. multiflorumSwitzerlandSwitzerland 201141 EPSP synthase inhibitors (G/9)
110Italian Ryegrass11007
48 September 9, 2015Amaranthus palmeriUnited States (Arkansas) United StatesArkansas201145 PPO inhibitors (E/14)
14Palmer Amaranth11006
49 September 2, 2015Amaranthus tuberculatus (=A. rudis)United States (Louisiana) United StatesLouisiana201545 EPSP synthase inhibitors (G/9)
219Tall Waterhemp11005
50 August 26, 2015Amaranthus tuberculatus (=A. rudis)United States (Minnesota) United StatesMinnesota201445 PPO inhibitors (E/14)
219Tall Waterhemp11004
51 August 21, 2015Parthenium hysterophorusUnited States (Florida) United StatesFlorida201445 EPSP synthase inhibitors (G/9)
124Ragweed Parthenium11003
52 August 20, 2015Polygonum lapathifoliumCanada (Alberta) CanadaAlberta20147 ALS inhibitors (B/2)
134Pale Smartweed11002
53 July 3, 2015Senecio vulgarisFranceFrance 200917 ALS inhibitors (B/2)
148Common Groundsel11001
54 June 29, 2015Sorghum halepenseSpainSpain 201538 ALS inhibitors (B/2)
166Johnsongrass11000
55 June 8, 2015Conyza canadensisJapanJapan 201425 EPSP synthase inhibitors (G/9)
61Horseweed10999
56 June 8, 2015Eleusine indicaJapanJapan 201325 EPSP synthase inhibitors (G/9)
81Goosegrass10998
57 June 8, 2015Echinochloa crus-galli var. formosensisJapanJapan 201025 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
304Taiwan barnyardgrass10997
58 May 12, 2015Apera spica-ventiSwedenSweden 200640 PSII inhibitor (Ureas and amides) (C2/7)
20Silky Windgrass10996
59 May 12, 2015Alopecurus myosuroidesSwedenSweden 201440 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
6Blackgrass10995
60 May 12, 2015Apera spica-ventiSwedenSweden 201040 ALS inhibitors (B/2)
20Silky Windgrass10994
61 April 28, 2015Senecio vernalisIsraelIsrael 201423 Multiple Resistance: 5 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
PSII inhibitor (Ureas and amides) (C2/7)
PPO inhibitors (E/14)
Carotenoid biosynthesis inhibitors (F1/12)
327Eastern Groundsel10993
62 April 28, 2015Lolium rigidumIsraelIsrael 201323 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
112Rigid Ryegrass10992
63 April 24, 2015Sorghum halepenseArgentinaArgentina 201548 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
EPSP synthase inhibitors (G/9)
166Johnsongrass10991
64 April 19, 2015Brachypodium distachyonIsraelIsrael 201423 ACCase inhibitors (A/1)
35Annual Falsebrome10990
65 April 15, 2015Sonchus oleraceusAustralia (South Australia) AustraliaSouth Australia20151 ALS inhibitors (B/2)
164Annual Sowthistle10989
66 April 15, 2015Sonchus oleraceusAustralia (South Australia) AustraliaSouth Australia20151 Synthetic Auxins (O/4)
164Annual Sowthistle10988
67 April 15, 2015Anthemis cotulaUnited States (Washington) United StatesWashington201045 ALS inhibitors (B/2)
19Mayweed Chamomile10987
68 April 11, 2015Kochia scopariaUnited States (North Dakota) United StatesNorth Dakota200445 Multiple Resistance: 2 Sites of Action
Photosystem II inhibitors (C1/5)
PSII inhibitor (Ureas and amides) (C2/7)
101Kochia10986
69 April 7, 2015Avena sterilis ssp. ludovicianaIranIran 200979 ALS inhibitors (B/2)
30Sterile oat10985
70 April 1, 2015Matricaria recutita (= M. chamomilla)PolandPoland 201433 ALS inhibitors (B/2)
248Wild Chamomile10984
71 March 31, 2015Papaver rhoeasPolandPoland 201433 ALS inhibitors (B/2)
123Corn Poppy10983
72 March 27, 2015Poa annuaUnited States (Mississippi) United StatesMississippi201445 ALS inhibitors (B/2)
130Annual Bluegrass10982
73 March 25, 2015Ambrosia artemisiifoliaUnited States (Wisconsin) United StatesWisconsin201345 ALS inhibitors (B/2)
18Common Ragweed10981
74 March 20, 2015Amaranthus tuberculatus (=A. rudis)United States (Arkansas) United StatesArkansas201545 EPSP synthase inhibitors (G/9)
219Tall Waterhemp10980
75 March 16, 2015Sorghum halepenseArgentinaArgentina 201548 ACCase inhibitors (A/1)
166Johnsongrass10979
76 March 9, 2015Alopecurus myosuroidesNetherlandsNetherlands 201043 ALS inhibitors (B/2)
6Blackgrass10978
77 March 9, 2015Polygonum persicariaNorwayNorway 200931 ALS inhibitors (B/2)
136Ladysthumb10977
78 March 9, 2015Sonchus asperNorwayNorway 200631 ALS inhibitors (B/2)
163Spiny Sowthistle10976
79 March 9, 2015Tripleurospermum perforatum (=T. inodorum)NorwayNorway 200631 ALS inhibitors (B/2)
116Scentless Chamomile10975
80 March 9, 2015Spergula arvensisNorwayNorway 200631 ALS inhibitors (B/2)
326Corn Spurry10974
81 March 2, 2015Kochia scopariaUnited States (Kansas) United StatesKansas201345 Multiple Resistance: 2 Sites of Action
EPSP synthase inhibitors (G/9)
Synthetic Auxins (O/4)
101Kochia10973
82 March 2, 2015Kochia scopariaUnited States (Kansas) United StatesKansas201345 Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
EPSP synthase inhibitors (G/9)
Synthetic Auxins (O/4)
101Kochia10972
83 March 31, 2015Tripleurospermum perforatum (=T. inodorum)PolandPoland 201433 ALS inhibitors (B/2)
116Scentless Chamomile10971
84 February 24, 2015Lamium amplexicauleUnited States (Kansas) United StatesKansas201445 ALS inhibitors (B/2)
323Henbit Deadnettle10970
85 March 31, 2015Alopecurus myosuroidesPolandPoland 201233 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
6Blackgrass10969
86 February 24, 2015Lolium perenne ssp. multiflorumUnited KingdomUnited Kingdom 201244 ALS inhibitors (B/2)
110Italian Ryegrass10968
87 February 3, 2015Bromus rubensAustralia (Western Australia) AustraliaWestern Australia20141 EPSP synthase inhibitors (G/9)
324Red Brome10964
88 January 29, 2015Bifora radiansTurkeyTurkey 200871 ALS inhibitors (B/2)
322Wild Bishop10962
89 January 28, 2015Kochia scopariaUnited States (Wyoming) United StatesWyoming201445 EPSP synthase inhibitors (G/9)
101Kochia10961
90 January 28, 2015Papaver rhoeasBelgiumBelgium 20143 ALS inhibitors (B/2)
123Corn Poppy10960
91 January 28, 2015Stellaria mediaBelgiumBelgium 20133 ALS inhibitors (B/2)
168Common Chickweed10959
92 January 26, 2015Amaranthus tuberculatus (=A. rudis)United States (Wisconsin) United StatesWisconsin201345 EPSP synthase inhibitors (G/9)
219Tall Waterhemp10958
93 January 26, 2015Amaranthus palmeriUnited States (Wisconsin) United StatesWisconsin201345 EPSP synthase inhibitors (G/9)
14Palmer Amaranth10957
94 January 25, 2015Echinochloa colonaUnited States (Arkansas) United StatesArkansas201145 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
PSII inhibitor (Ureas and amides) (C2/7)
Cellulose inhibitors (L/26)
78Junglerice10956
95 January 20, 2015Alopecurus japonicusChinaChina 20149 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
5Japanese Foxtail10955
96 January 20, 2015Alopecurus aequalisChinaChina 20149 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
264Shortawn Foxtail10954
97 January 20, 2015Vicia sativaChinaChina 20149 ALS inhibitors (B/2)
321Common Vetch10953
98 January 20, 2015Galium aparineChinaChina 20149 Synthetic Auxins (O/4)
272Catchweed Bedstraw10952
99 January 20, 2015Phalaris brachystachysIranIran 201479 ACCase inhibitors (A/1)
244Shortspike Canarygrass10951
100 January 20, 2015Echinochloa colonaVenezuelaVenezuela 200880 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
EPSP synthase inhibitors (G/9)
78Junglerice10950
101 January 20, 2015Rumex dentatusIndiaIndia 201421 ALS inhibitors (B/2)
320Toothed Dock10949
102 January 20, 2015Leptochloa chinensisMalaysiaMalaysia 200628 PSII inhibitor (Ureas and amides) (C2/7)
223Chinese Sprangletop10948
103 January 20, 2015Amaranthus hybridus (syn: quitensis)ArgentinaArgentina 201448 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
12Smooth Pigweed9948
104 January 12, 2015Ageratum conyzoidesBrazilBrazil 20135 ALS inhibitors (B/2)
319Tropical Whiteweed9947
105 January 7, 2015Stellaria mediaFinlandFinland 2013139 ALS inhibitors (B/2)
168Common Chickweed9946
106 December 29, 2014Kochia scopariaUnited States (Idaho) United StatesIdaho201445 EPSP synthase inhibitors (G/9)
101Kochia9945
107 December 26, 2014Kochia scopariaUnited States (Oregon) United StatesOregon201445 EPSP synthase inhibitors (G/9)
101Kochia9944
108 December 17, 2014Conyza canadensisUnited States (California) United StatesCalifornia201445 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
61Horseweed9943
109 December 9, 2014Kochia scopariaCanada (Manitoba) CanadaManitoba20147 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia9942
110 December 5, 2014Amaranthus tuberculatus (=A. rudis)Canada (Ontario) CanadaOntario20147 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
219Tall Waterhemp9940
111 November 25, 2014Tripleurospermum perforatum (=T. inodorum)FranceFrance 201017 ALS inhibitors (B/2)
116Scentless Chamomile9939
112 November 25, 2014Avena fatuaFranceFrance 200617 ALS inhibitors (B/2)
28Wild Oat9938
113 November 25, 2014Avena sterilisFranceFrance 200617 ALS inhibitors (B/2)
29Sterile Oat9937
114 November 25, 2014Apera spica-ventiFranceFrance 200617 ALS inhibitors (B/2)
20Silky Windgrass9936
115 November 25, 2014Echinochloa phyllopogon (=E. oryzicola)FranceFrance 201317 ALS inhibitors (B/2)
178Late Watergrass9935
116 December 20, 2015Echinochloa crus-galli var. crus-galliFranceFrance 201317 ALS inhibitors (B/2)
79Barnyardgrass9934
117 December 20, 2015Setaria viridisFranceFrance 201117 ALS inhibitors (B/2)
153Green Foxtail9933
118 November 25, 2014Conyza sumatrensisFranceFrance 201017 EPSP synthase inhibitors (G/9)
65Sumatran Fleabane9932
119 November 25, 2014Bromus sterilisFranceFrance 200917 ALS inhibitors (B/2)
289Poverty Brome9931
120 November 25, 2014Helianthus annuusFranceFrance 200917 ALS inhibitors (B/2)
95Common Sunflower9929
121 November 13, 2014Chenopodium albumSwedenSweden 200540 Photosystem II inhibitors (C1/5)
47Common Lambsquarters9928
122 January 20, 2015Eleusine indicaMalaysiaMalaysia 200928 Multiple Resistance: 4 Sites of Action
ACCase inhibitors (A/1)
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
Glutamine synthase inhibitors (H/10)
81Goosegrass9927
123 November 6, 2014Kochia scopariaUnited States (Nebraska) United StatesNebraska201445 Photosystem II inhibitors (C1/5)
101Kochia9926
124 October 17, 2014Ixophorus unisetusMexicoMexico 201429 ALS inhibitors (B/2)
100Pasto Honduras (Mexicangrass)9925
125 October 14, 2014Schoenoplectus mucronatus (=Scirpus mucronatus)United States (California) United StatesCalifornia201445 PSII inhibitor (Ureas and amides) (C2/7)
182Ricefield Bulrush9924
126 October 15, 2014Bidens pilosaMexicoMexico 201429 EPSP synthase inhibitors (G/9)
32Hairy Beggarticks9923
127 September 29, 2014Amaranthus palmeriUnited States (New Jersey) United StatesNew Jersey201445 EPSP synthase inhibitors (G/9)
14Palmer Amaranth9922
128 September 11, 2014Amaranthus palmeriIsraelIsrael 200823 ALS inhibitors (B/2)
14Palmer Amaranth9921
129 September 1, 2014Brachiaria eruciformisAustralia (Queensland) AustraliaQueensland20141 EPSP synthase inhibitors (G/9)
318Sweet Summer Grass8921
130 February 24, 2015Cyperus odoratusVenezuelaVenezuela 201480 ALS inhibitors (B/2)
317Fragrant Flatsedge8920
131 July 8, 2014Amaranthus tuberculatus (=A. rudis)United States (Indiana) United StatesIndiana201445 PPO inhibitors (E/14)
219Tall Waterhemp8919
132 June 26, 2014Chloris elataBrazilBrazil 20145 EPSP synthase inhibitors (G/9)
316Tall Windmill Grass8918
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, September 29, 2016 .  Available  www.weedscience.org
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