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 June 16, 2017Amaranthus tuberculatus (=A. rudis)United States (Mississippi) United StatesMississippi201045 ALS inhibitors (B/2)
219Tall Waterhemp16080
2 June 16, 2017Amaranthus retroflexusUnited States (Mississippi) United StatesMississippi201045 ALS inhibitors (B/2)
16Redroot Pigweed16079
3 May 16, 2017Amaranthus retroflexusChinaChina 20179 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
16Redroot Pigweed16078
4 May 12, 2017Conyza canadensisSouth KoreaSouth Korea 201727 EPSP synthase inhibitors (G/9)
61Horseweed16077
5 May 7, 2017Apera spica-ventiDenmarkDenmark 201613 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
20Silky Windgrass15078
6 May 7, 2017Lolium perenneDenmarkDenmark 201613 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
111Perennial Ryegrass15077
7 April 11, 2017Tripleurospermum perforatum (=T. inodorum)SwedenSweden 201540 ALS inhibitors (B/2)
116Scentless Chamomile15076
8 April 11, 2017Matricaria recutita (= M. chamomilla)SwedenSweden 201440 ALS inhibitors (B/2)
248Wild Chamomile15075
9 April 11, 2017Phalaris minorPakistanPakistan 201586 ACCase inhibitors (A/1)
127Little seed Canary grass15074
10 April 3, 2017Eleusine indicaUnited States (Virginia) United StatesVirginia201545 PPO inhibitors (E/14)
81Goosegrass15073
11 April 3, 2017Eleusine indicaUnited States (North Carolina) United StatesNorth Carolina201545 PPO inhibitors (E/14)
81Goosegrass15072
12 March 21, 2017Bromus tectorumUnited States (Montana) United StatesMontana201645 ALS inhibitors (B/2)
40Downy Brome (Cheatgrass)15071
13 March 20, 2017Conyza canadensisHungaryHungary 201620 EPSP synthase inhibitors (G/9)
61Horseweed15070
14 March 8, 2017Echinochloa crus-galli var. crus-galliBrazilBrazil 20155 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Cellulose inhibitors (L/26)
79Barnyardgrass15069
15 March 8, 2017Stellaria mediaLatviaLatvia 2016174 ALS inhibitors (B/2)
168Common Chickweed15068
16 March 8, 2017Apera spica-ventiLatviaLatvia 2015174 ALS inhibitors (B/2)
20Silky Windgrass15067
17 February 22, 2017Lolium perenne ssp. multiflorumUnited States (California) United StatesCalifornia201545 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
110Italian Ryegrass15066
18 February 22, 2017Sorghum halepenseSerbiaSerbia 2014245 ALS inhibitors (B/2)
166Johnsongrass15065
19 June 15, 2017Galium aparineIranIran 201679 ALS inhibitors (B/2)
272Catchweed Bedstraw15064
20 June 6, 2017Lolium perenne ssp. multiflorumBrazilBrazil 20175 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
110Italian Ryegrass15063
21 February 9, 2017Helianthus annuusUnited States (Texas) United StatesTexas201545 EPSP synthase inhibitors (G/9)
95Common Sunflower15062
22 December 16, 2016Centaurea stoebe ssp. micranthosCanada (British Columbia) CanadaBritish Columbia20137 Synthetic Auxins (O/4)
334Spotted knapweed15061
23 December 18, 2016Avena fatuaSyriaSyria 201569 ACCase inhibitors (A/1)
28Wild Oat15060
24 December 18, 2016Phalaris paradoxaSyriaSyria 201569 ACCase inhibitors (A/1)
128Hood Canarygrass15059
25 December 18, 2016Phalaris brachystachysSyriaSyria 201569 ACCase inhibitors (A/1)
244Shortspike Canarygrass15058
26 December 12, 2016Lolium perenne ssp. multiflorumBrazilBrazil 20165 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
110Italian Ryegrass15057
27 December 2, 2016Sonchus oleraceusAustralia (Victoria) AustraliaVictoria20151 Synthetic Auxins (O/4)
164Annual Sowthistle15056
28 December 2, 2016Arctotheca calendulaAustralia (South Australia) AustraliaSouth Australia20151 Synthetic Auxins (O/4)
21Capeweed15055
29 November 27, 2016Papaver rhoeasFranceFrance 201617 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
123Corn Poppy15054
30 November 21, 2016Sonchus asperFranceFrance 201517 ALS inhibitors (B/2)
163Spiny Sowthistle14058
31 November 17, 2016Ranunculus acrisNew ZealandNew Zealand 201030 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
140Tall Buttercup14057
32 November 17, 2016Lolium perenne ssp. multiflorumNew ZealandNew Zealand 201530 Multiple Resistance: 3 Sites of Action
Carotenoid biosynthesis (unknown target) (F3/11)
EPSP synthase inhibitors (G/9)
Glutamine synthase inhibitors (H/10)
110Italian Ryegrass14056
33 November 17, 2016Lolium perenneNew ZealandNew Zealand 201530 Multiple Resistance: 3 Sites of Action
Carotenoid biosynthesis (unknown target) (F3/11)
EPSP synthase inhibitors (G/9)
Glutamine synthase inhibitors (H/10)
111Perennial Ryegrass14055
34 November 17, 2016Avena fatuaNew ZealandNew Zealand 201430 ACCase inhibitors (A/1)
28Wild Oat14054
35 November 2, 2016Bidens pilosaBrazilBrazil 20165 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
32Hairy Beggarticks14053
36 October 27, 2016Tridax procumbensAustralia (Western Australia) AustraliaWestern Australia20161 EPSP synthase inhibitors (G/9)
333Coat Buttons14052
37 October 26, 2016Amaranthus tuberculatus (=A. rudis)United States (Illinois) United StatesIllinois201645 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)
219Tall Waterhemp14051
38 October 26, 2016Amaranthus tuberculatus (=A. rudis)United States (Minnesota) United StatesMinnesota201645 Multiple Resistance: 2 Sites of Action
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
219Tall Waterhemp13056
39 October 23, 2016Salsola tragusUnited States (Oregon) United StatesOregon201645 EPSP synthase inhibitors (G/9)
147Russian-thistle13055
40 October 19, 2016Oryza sativa var. sylvaticaGreeceGreece 201319 ALS inhibitors (B/2)
242Red Rice13054
41 October 19, 2016Lolium rigidumGreeceGreece 200919 ALS inhibitors (B/2)
112Rigid Ryegrass13053
42 October 19, 2016Echinochloa phyllopogon (=E. oryzicola)GreeceGreece 200919 ALS inhibitors (B/2)
178Late Watergrass13052
43 October 19, 2016Cyperus difformisGreeceGreece 200919 ALS inhibitors (B/2)
71Smallflower Umbrella Sedge13051
44 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
45 September 19, 2016Digitaria insularisArgentinaArgentina 201448 EPSP synthase inhibitors (G/9)
239Sourgrass13049
46 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
47 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
48 August 22, 2016Oryza sativa var. sylvaticaUnited States (Arkansas) United StatesArkansas200245 ALS inhibitors (B/2)
242Red Rice13046
49 August 19, 2016Conyza bonariensisAustralia (New South Wales ) AustraliaNew South Wales 20161 PSI Electron Diverter (D/22)
60Hairy Fleabane13045
50 August 3, 2016Lolium perenne ssp. multiflorumUnited States (California) United StatesCalifornia201545 Glutamine synthase inhibitors (H/10)
110Italian Ryegrass13044
51 July 19, 2016Digitaria insularisBrazilBrazil 20165 ACCase inhibitors (A/1)
239Sourgrass13043
52 July 19, 2016Amaranthus palmeriBrazilBrazil 20165 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth13042
53 December 18, 2016Amaranthus palmeriUnited States (California) United StatesCalifornia201545 EPSP synthase inhibitors (G/9)
14Palmer Amaranth13041
54 July 4, 2016Cyperus iriaBrazilBrazil 20145 ALS inhibitors (B/2)
266Rice Flatsedge13040
55 June 28, 2016Eleusine indicaBrazilBrazil 20165 EPSP synthase inhibitors (G/9)
81Goosegrass13039
56 May 24, 2016Amaranthus palmeriArgentinaArgentina 201548 EPSP synthase inhibitors (G/9)
14Palmer Amaranth13038
57 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
58 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
59 May 2, 2016Chamaesyce maculataUnited States (Georgia) United StatesGeorgia201445 ALS inhibitors (B/2)
332Spotted Spurge13035
60 April 27, 2016Eleusine indicaIndonesiaIndonesia 201222 PSI Electron Diverter (D/22)
81Goosegrass13034
61 April 26, 2016Amaranthus retroflexusBrazilBrazil 20145 PPO inhibitors (E/14)
16Redroot Pigweed13033
62 April 18, 2016Echium plantagineumBrazilBrazil 20155 ALS inhibitors (B/2)
186Patersons Curse12033
63 March 3, 2016Salsola tragusUnited States (Montana) United StatesMontana201545 EPSP synthase inhibitors (G/9)
147Russian-thistle12032
64 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
65 February 25, 2016Kochia scopariaCanada (Saskatchewan) CanadaSaskatchewan20157 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
101Kochia11032
66 February 8, 2016Lolium rigidumAustralia (New South Wales ) AustraliaNew South Wales 20151 Lipid Inhibitors (N/8)
112Rigid Ryegrass11031
67 February 6, 2016Vulpia bromoidesAustralia (Western Australia) AustraliaWestern Australia20141 Photosystem II inhibitors (C1/5)
173Squirreltail Fescue11030
68 February 8, 2016Gamochaeta pensylvanicaAustralia (Queensland) AustraliaQueensland20151 PSI Electron Diverter (D/22)
298Pennsylvania Everlasting11029
69 February 8, 2016Chloris virgataAustralia (South Australia) AustraliaSouth Australia20151 EPSP synthase inhibitors (G/9)
330Feather Fingergrass11028
70 February 8, 2016Chloris virgataAustralia (Queensland) AustraliaQueensland20151 EPSP synthase inhibitors (G/9)
330Feather Fingergrass11027
71 February 8, 2016Chloris virgataAustralia (New South Wales ) AustraliaNew South Wales 20151 EPSP synthase inhibitors (G/9)
330Feather Fingergrass11026
72 February 8, 2016Solanum nigrumAustralia (Queensland) AustraliaQueensland20151 PSI Electron Diverter (D/22)
162Black Nightshade11025
73 February 8, 2016Eleusine indicaAustralia (Queensland) AustraliaQueensland20151 PSI Electron Diverter (D/22)
81Goosegrass11024
74 February 6, 2016Lolium rigidumAustralia (Victoria) AustraliaVictoria20151 Lipid Inhibitors (N/8)
112Rigid Ryegrass11023
75 February 8, 2016Lactuca serriolaAustralia (Victoria) AustraliaVictoria20151 EPSP synthase inhibitors (G/9)
102Prickly Lettuce11022
76 February 8, 2016Chloris truncataAustralia (Victoria) AustraliaVictoria20151 EPSP synthase inhibitors (G/9)
262Windmill Grass11021
77 April 27, 2016Eleusine indicaIndonesiaIndonesia 201222 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
81Goosegrass11020
78 February 4, 2016Alopecurus aequalisJapanJapan 200625 ALS inhibitors (B/2)
264Shortawn Foxtail11019
79 February 4, 2016Alopecurus aequalisJapanJapan 200525 Microtubule inhibitors (K1/3)
264Shortawn Foxtail11018
80 February 4, 2016Atriplex patulaBelgiumBelgium 20153 Photosystem II inhibitors (C1/5)
26Halberdleaf Orach11017
81 February 2, 2016Echinochloa crus-galli var. crus-galliSpainSpain 201538 ALS inhibitors (B/2)
79Barnyardgrass11016
82 February 1, 2016Cyperus iriaVenezuelaVenezuela 201580 ALS inhibitors (B/2)
266Rice Flatsedge11015
83 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
84 January 20, 2016Chenopodium albumFinlandFinland 2015139 ALS inhibitors (B/2)
47Common Lambsquarters11013
85 January 14, 2016Cyperus compressusUnited States (Alabama) United StatesAlabama201545 ALS inhibitors (B/2)
329Annual Sedge11012
86 January 10, 2016Conyza canadensisUnited States (Montana) United StatesMontana201545 EPSP synthase inhibitors (G/9)
61Horseweed11011
87 December 20, 2015Digitaria sanguinalisFranceFrance 201517 ALS inhibitors (B/2)
77Large Crabgrass11010
88 December 20, 2015Amaranthus palmeriBrazilBrazil 20155 EPSP synthase inhibitors (G/9)
14Palmer Amaranth11009
89 October 4, 2015Hirschfeldia incanaArgentinaArgentina 201348 ALS inhibitors (B/2)
328Shortpod Mustard11008
90 September 13, 2015Lolium perenne ssp. multiflorumSwitzerlandSwitzerland 201141 EPSP synthase inhibitors (G/9)
110Italian Ryegrass11007
91 May 9, 2017Amaranthus palmeriUnited States (Arkansas) United StatesArkansas201145 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
14Palmer Amaranth11006
92 September 2, 2015Amaranthus tuberculatus (=A. rudis)United States (Louisiana) United StatesLouisiana201545 EPSP synthase inhibitors (G/9)
219Tall Waterhemp11005
93 August 26, 2015Amaranthus tuberculatus (=A. rudis)United States (Minnesota) United StatesMinnesota201445 PPO inhibitors (E/14)
219Tall Waterhemp11004
94 August 21, 2015Parthenium hysterophorusUnited States (Florida) United StatesFlorida201445 EPSP synthase inhibitors (G/9)
124Ragweed Parthenium11003
95 August 20, 2015Polygonum lapathifoliumCanada (Alberta) CanadaAlberta20147 ALS inhibitors (B/2)
134Pale Smartweed11002
96 July 3, 2015Senecio vulgarisFranceFrance 200917 ALS inhibitors (B/2)
148Common Groundsel11001
97 June 29, 2015Sorghum halepenseSpainSpain 201538 ALS inhibitors (B/2)
166Johnsongrass11000
98 June 8, 2015Conyza canadensisJapanJapan 201425 EPSP synthase inhibitors (G/9)
61Horseweed10999
99 June 8, 2015Eleusine indicaJapanJapan 201325 EPSP synthase inhibitors (G/9)
81Goosegrass10998
100 June 8, 2015Echinochloa crus-galli var. formosensisJapanJapan 201025 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
304Taiwan barnyardgrass10997
101 May 12, 2015Apera spica-ventiSwedenSweden 200640 PSII inhibitor (Ureas and amides) (C2/7)
20Silky Windgrass10996
102 May 12, 2015Alopecurus myosuroidesSwedenSweden 201440 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
6Blackgrass10995
103 May 12, 2015Apera spica-ventiSwedenSweden 201040 ALS inhibitors (B/2)
20Silky Windgrass10994
104 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
105 April 28, 2015Lolium rigidumIsraelIsrael 201323 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
112Rigid Ryegrass10992
106 April 24, 2015Sorghum halepenseArgentinaArgentina 201548 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
EPSP synthase inhibitors (G/9)
166Johnsongrass10991
107 April 19, 2015Brachypodium distachyonIsraelIsrael 201423 ACCase inhibitors (A/1)
35Annual Falsebrome10990
108 April 15, 2015Sonchus oleraceusAustralia (South Australia) AustraliaSouth Australia20151 ALS inhibitors (B/2)
164Annual Sowthistle10989
109 April 15, 2015Sonchus oleraceusAustralia (South Australia) AustraliaSouth Australia20151 Synthetic Auxins (O/4)
164Annual Sowthistle10988
110 April 15, 2015Anthemis cotulaUnited States (Washington) United StatesWashington201045 ALS inhibitors (B/2)
19Mayweed Chamomile10987
111 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
112 April 7, 2015Avena sterilis ssp. ludovicianaIranIran 200979 ALS inhibitors (B/2)
30Sterile oat10985
113 April 1, 2015Matricaria recutita (= M. chamomilla)PolandPoland 201433 ALS inhibitors (B/2)
248Wild Chamomile10984
114 March 31, 2015Papaver rhoeasPolandPoland 201433 ALS inhibitors (B/2)
123Corn Poppy10983
115 March 27, 2015Poa annuaUnited States (Mississippi) United StatesMississippi201445 ALS inhibitors (B/2)
130Annual Bluegrass10982
116 March 25, 2015Ambrosia artemisiifoliaUnited States (Wisconsin) United StatesWisconsin201345 ALS inhibitors (B/2)
18Common Ragweed10981
117 March 20, 2015Amaranthus tuberculatus (=A. rudis)United States (Arkansas) United StatesArkansas201545 EPSP synthase inhibitors (G/9)
219Tall Waterhemp10980
118 March 16, 2015Sorghum halepenseArgentinaArgentina 201548 ACCase inhibitors (A/1)
166Johnsongrass10979
119 March 9, 2015Alopecurus myosuroidesNetherlandsNetherlands 201043 ALS inhibitors (B/2)
6Blackgrass10978
120 March 9, 2015Polygonum persicariaNorwayNorway 200931 ALS inhibitors (B/2)
136Ladysthumb10977
121 March 9, 2015Sonchus asperNorwayNorway 200631 ALS inhibitors (B/2)
163Spiny Sowthistle10976
122 March 9, 2015Tripleurospermum perforatum (=T. inodorum)NorwayNorway 200631 ALS inhibitors (B/2)
116Scentless Chamomile10975
123 March 9, 2015Spergula arvensisNorwayNorway 200631 ALS inhibitors (B/2)
326Corn Spurry10974
124 March 2, 2015Kochia scopariaUnited States (Kansas) United StatesKansas201345 Multiple Resistance: 2 Sites of Action
EPSP synthase inhibitors (G/9)
Synthetic Auxins (O/4)
101Kochia10973
125 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
126 March 31, 2015Tripleurospermum perforatum (=T. inodorum)PolandPoland 201433 ALS inhibitors (B/2)
116Scentless Chamomile10971
127 February 24, 2015Lamium amplexicauleUnited States (Kansas) United StatesKansas201445 ALS inhibitors (B/2)
323Henbit Deadnettle10970
128 March 31, 2015Alopecurus myosuroidesPolandPoland 201233 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
6Blackgrass10969
129 February 24, 2015Lolium perenne ssp. multiflorumUnited KingdomUnited Kingdom 201244 ALS inhibitors (B/2)
110Italian Ryegrass10968
130 February 3, 2015Bromus rubensAustralia (Western Australia) AustraliaWestern Australia20141 EPSP synthase inhibitors (G/9)
324Red Brome10964
131 January 29, 2015Bifora radiansTurkeyTurkey 200871 ALS inhibitors (B/2)
322Wild Bishop10962
132 January 28, 2015Kochia scopariaUnited States (Wyoming) United StatesWyoming201445 EPSP synthase inhibitors (G/9)
101Kochia10961
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