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 October 17, 2014Ixophorus unisetusMexicoMexico 201429 ALS inhibitors (B/2)
100Pasto Honduras (Mexicangrass)9925
2 October 15, 2014Bidens pilosaMexicoMexico 201429 EPSP synthase inhibitors (G/9)
32Hairy Beggarticks9923
3 October 14, 2014Schoenoplectus mucronatus (=Scirpus mucronatus)United States (California) United StatesCalifornia201445 PSII inhibitor (Ureas and amides) (C2/7)
182Ricefield Bulrush9924
4 September 29, 2014Amaranthus palmeriUnited States (New Jersey) United StatesNew Jersey201445 EPSP synthase inhibitors (G/9)
14Palmer Amaranth9922
5 September 11, 2014Amaranthus palmeriIsraelIsrael 200823 ALS inhibitors (B/2)
14Palmer Amaranth9921
6 September 1, 2014Brachiaria eruciformisAustralia (Queensland) AustraliaQueensland20141 EPSP synthase inhibitors (G/9)
318Sweet Summer Grass8921
7 July 20, 2014Cyperus odoratusVenezuelaVenezuela 201480 ALS inhibitors (B/2)
317Fragrant Flatsedge8920
8 July 8, 2014Amaranthus tuberculatus (=A. rudis)United States (Indiana) United StatesIndiana201445 PPO inhibitors (E/14)
219Tall Waterhemp8919
9 June 26, 2014Chloris elataBrazilBrazil 20145 EPSP synthase inhibitors (G/9)
316Tall Windmill Grass8918
10 June 11, 2014Ambrosia artemisiifoliaUnited States (Nebraska) United StatesNebraska201345 EPSP synthase inhibitors (G/9)
18Common Ragweed8917
11 May 29, 2014Amaranthus palmeriUnited States (Maryland) United StatesMaryland201445 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth8915
12 May 29, 2014Amaranthus palmeriUnited States (Delaware) United StatesDelaware201445 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth8914
13 May 29, 2014Ambrosia artemisiifoliaUnited States (New Jersey) United StatesNew Jersey201345 EPSP synthase inhibitors (G/9)
18Common Ragweed8916
14 May 12, 2014Papaver rhoeasSwedenSweden 201140 ALS inhibitors (B/2)
123Corn Poppy8913
15 May 12, 2014Alopecurus myosuroidesSwedenSweden 201140 ACCase inhibitors (A/1)
6Blackgrass8911
16 May 12, 2014Alopecurus myosuroidesSwedenSweden 201140 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Lipid Inhibitors (thiocarbamates) (N/8)
6Blackgrass8912
17 May 12, 2014Capsella bursa-pastorisDenmarkDenmark 201213 ALS inhibitors (B/2)
41Shepherd's-purse8910
18 May 8, 2014Echinochloa erectaItalyItaly 200524 PSII inhibitor (Ureas and amides) (C2/7)
236Pollacci Barnyardgrass8909
19 May 8, 2014Avena sterilisItalyItaly 200724 ALS inhibitors (B/2)
29Sterile Oat8908
20 May 8, 2014Lolium perenne ssp. multiflorumItalyItaly 200524 ALS inhibitors (B/2)
110Italian Ryegrass8907
21 May 8, 2014Lolium perenne ssp. multiflorumItalyItaly 199524 ACCase inhibitors (A/1)
110Italian Ryegrass8906
22 May 8, 2014Sorghum halepenseItalyItaly 200724 ALS inhibitors (B/2)
166Johnsongrass8905
23 May 8, 2014Echinochloa crus-galli var. crus-galliItalyItaly 201124 ACCase inhibitors (A/1)
79Barnyardgrass8904
24 May 8, 2014Lolium perenne ssp. multiflorumItalyItaly 201224 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
110Italian Ryegrass8903
25 May 8, 2014Lolium perenne ssp. multiflorumItalyItaly 200824 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
EPSP synthase inhibitors (G/9)
110Italian Ryegrass8902
26 April 29, 2014Echinochloa crus-galli var. crus-galliUnited States (Mississippi) United StatesMississippi201145 Multiple Resistance: 4 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
PSII inhibitor (Ureas and amides) (C2/7)
Cellulose inhibitors (L/26)
79Barnyardgrass8901
27 April 29, 2014Ambrosia artemisiifoliaUnited States (Mississippi) United StatesMississippi201445 EPSP synthase inhibitors (G/9)
18Common Ragweed8900
28 April 22, 2014Ehrharta longifloraAustralia (Western Australia) AustraliaWestern Australia20141 ACCase inhibitors (A/1)
315Longflowered veldtgrass 8899
29 April 16, 2014Lolium perenne ssp. multiflorumUnited States (Louisiana) United StatesLouisiana201445 EPSP synthase inhibitors (G/9)
110Italian Ryegrass8898
30 April 3, 2014Convolvulus arvensisJordanJordan 201155 PSI Electron Diverter (D/22)
312Field Bindweed7890
31 March 31, 2014Stellaria mediaUnited States (Pennsylvania) United StatesPennsylvania201045 ALS inhibitors (B/2)
168Common Chickweed7898
32 March 7, 2014Echinochloa crus-galli var. crus-galliEgyptEgypt 200915 ACCase inhibitors (A/1)
79Barnyardgrass7897
33 March 7, 2014Echinochloa colonaEgyptEgypt 201215 ALS inhibitors (B/2)
78Junglerice7896
34 March 7, 2014Raphanus raphanistrumBrazilBrazil 20135 ALS inhibitors (B/2)
141Wild Radish7895
35 March 4, 2014Polypogon fugaxChinaChina 20149 ACCase inhibitors (A/1)
313Asia Minor bluegrass7893
36 February 13, 2014Sonchus oleraceusAustralia (New South Wales ) AustraliaNew South Wales 20141 EPSP synthase inhibitors (G/9)
164Annual Sowthistle7892
37 February 13, 2014Lolium perenne ssp. multiflorumUnited States (Kentucky) United StatesKentucky201345 ALS inhibitors (B/2)
110Italian Ryegrass7891
38 February 7, 2014Matricaria recutita (= M. chamomilla)BelgiumBelgium 20123 ALS inhibitors (B/2)
248Wild Chamomile7889
39 February 7, 2014Eleusine indicaMalaysiaMalaysia 200928 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
Glutamine synthase inhibitors (H/10)
81Goosegrass7873
40 February 3, 2014Raphanus raphanistrumAustralia (Western Australia) AustraliaWestern Australia20101 Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
Carotenoid biosynthesis inhibitors (F1/12)
EPSP synthase inhibitors (G/9)
Synthetic Auxins (O/4)
141Wild Radish7888
41 February 2, 2014Eleusine indicaBoliviaBolivia 20074 EPSP synthase inhibitors (G/9)
81Goosegrass7887
42 February 2, 2014Echinochloa colonaCosta RicaCosta Rica 201311 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
78Junglerice7886
43 January 30, 2014Oryza sativa var. sylvaticaCosta RicaCosta Rica 201011 ALS inhibitors (B/2)
242Red Rice7885
44 January 29, 2014Eleusine indicaCosta RicaCosta Rica 201011 EPSP synthase inhibitors (G/9)
81Goosegrass7884
45 January 28, 2014Stellaria mediaUnited States (Kentucky) United StatesKentucky201345 ALS inhibitors (B/2)
168Common Chickweed7883
46 January 28, 2014Amaranthus palmeriUnited States (Kentucky) United StatesKentucky201045 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7882
47 January 28, 2014Amaranthus tuberculatus (=A. rudis)United States (Kentucky) United StatesKentucky201045 EPSP synthase inhibitors (G/9)
219Tall Waterhemp7881
48 January 27, 2014Clidemia hirtaMalaysiaMalaysia 201028 ALS inhibitors (B/2)
311Soapbush7876
49 January 27, 2014Hedyotis verticillataMalaysiaMalaysia 200528 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
310Woody borreria7872
50 January 24, 2014Alopecurus myosuroidesCzech RepublicCzech Republic 200812 ALS inhibitors (B/2)
6Blackgrass7871
51 January 24, 2014Amaranthus palmeriUnited States (Florida) United StatesFlorida201345 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7869
52 January 24, 2014Amaranthus palmeriUnited States (Florida) United StatesFlorida201345 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth7870
53 January 23, 2014Kochia scopariaUnited States (Colorado) United StatesColorado199945 Synthetic Auxins (O/4)
101Kochia7868
54 January 23, 2014Amaranthus palmeriUnited States (Illinois) United StatesIllinois201345 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth7867
55 January 23, 2014Amaranthus palmeriUnited States (Illinois) United StatesIllinois201345 ALS inhibitors (B/2)
14Palmer Amaranth7866
56 January 23, 2014Conyza canadensisUnited States (Illinois) United StatesIllinois201345 ALS inhibitors (B/2)
61Horseweed7865
57 January 23, 2014Amaranthus tuberculatus (=A. rudis)United States (Illinois) United StatesIllinois200945 Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
219Tall Waterhemp7864
58 January 23, 2014Setaria faberiUnited States (Illinois) United StatesIllinois199845 ACCase inhibitors (A/1)
149Giant Foxtail7863
59 January 23, 2014Setaria faberiUnited States (Illinois) United StatesIllinois200745 ALS inhibitors (B/2)
149Giant Foxtail7862
60 January 23, 2014Sorghum bicolorUnited States (Illinois) United StatesIllinois200045 ALS inhibitors (B/2)
165Shattercane7861
61 January 22, 2014Lolium perenne ssp. multiflorumUnited States (North Carolina) United StatesNorth Carolina200945 EPSP synthase inhibitors (G/9)
110Italian Ryegrass7811
62 January 22, 2014Ambrosia artemisiifoliaUnited States (North Carolina) United StatesNorth Carolina200645 ALS inhibitors (B/2)
18Common Ragweed7857
63 January 22, 2014Lolium perenne ssp. multiflorumUnited States (North Carolina) United StatesNorth Carolina200745 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
110Italian Ryegrass7856
64 January 22, 2014Leptochloa chinensisSouth KoreaSouth Korea 201227 ACCase inhibitors (A/1)
223Chinese Sprangletop7855
65 January 22, 2014Ludwigia prostrataSouth KoreaSouth Korea 201127 ALS inhibitors (B/2)
309False Loosestrife7854
66 January 22, 2014Sagittaria trifoliaSouth KoreaSouth Korea 201127 ALS inhibitors (B/2)
294Threeleaf Arrowhead7851
67 January 22, 2014Blyxa aubertiiSouth KoreaSouth Korea 200627 ALS inhibitors (B/2)
308Roundfruit Blyxa7850
68 January 22, 2014Eleocharis acicularisSouth KoreaSouth Korea 200627 ALS inhibitors (B/2)
295Needle Spikerush7849
69 January 22, 2014Schoenoplectus fluviatilisSouth KoreaSouth Korea 200427 ALS inhibitors (B/2)
307River Bulrush7848
70 January 22, 2014Raphanus raphanistrumAustralia (Victoria) AustraliaVictoria20111 Synthetic Auxins (O/4)
141Wild Radish7846
71 January 22, 2014Raphanus raphanistrumAustralia (Victoria) AustraliaVictoria20091 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
141Wild Radish7845
72 January 22, 2014Sonchus oleraceusAustralia (Victoria) AustraliaVictoria20101 ALS inhibitors (B/2)
164Annual Sowthistle7844
73 January 22, 2014Sisymbrium orientaleAustralia (Victoria) AustraliaVictoria20101 ALS inhibitors (B/2)
159Oriental Mustard7842
74 January 22, 2014Vulpia bromoidesAustralia (Victoria) AustraliaVictoria20091 Photosystem II inhibitors (C1/5)
173Squirreltail Fescue7841
75 January 22, 2014Phalaris paradoxaAustralia (New South Wales ) AustraliaNew South Wales 20121 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
128Hood Canarygrass7840
76 January 22, 2014Raphanus raphanistrumAustralia (New South Wales ) AustraliaNew South Wales 20131 Synthetic Auxins (O/4)
141Wild Radish7839
77 January 21, 2014Phalaris minorAustralia (Victoria) AustraliaVictoria20121 ACCase inhibitors (A/1)
127Little seed Canary grass7838
78 January 21, 2014Galium tricornutumAustralia (South Australia) AustraliaSouth Australia20121 ALS inhibitors (B/2)
306Threehorn Bedstraw7837
79 January 19, 2014Conyza canadensisUnited States (Indiana) United StatesIndiana200545 ALS inhibitors (B/2)
61Horseweed7836
80 January 19, 2014Amaranthus palmeriUnited States (Indiana) United StatesIndiana201245 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7835
81 January 19, 2014Kochia scopariaCanada (Saskatchewan) CanadaSaskatchewan20127 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia7834
82 January 19, 2014Ambrosia trifidaCanada (Ontario) CanadaOntario20117 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
184Giant Ragweed7833
83 January 19, 2014Lolium persicumCanada (Alberta) CanadaAlberta20097 ACCase inhibitors (A/1)
181Persian Darnel7832
84 January 19, 2014Salsola tragusCanada (Alberta) CanadaAlberta20077 ALS inhibitors (B/2)
147Russian-thistle7831
85 January 15, 2014Chenopodium albumSerbiaSerbia 2007245 ALS inhibitors (B/2)
47Common Lambsquarters7828
86 January 15, 2014Datura stramoniumSerbiaSerbia 2004245 ALS inhibitors (B/2)
75Jimsonweed7826
87 January 14, 2014Lolium perennePortugalPortugal 201334 EPSP synthase inhibitors (G/9)
111Perennial Ryegrass7825
88 January 14, 2014Conyza canadensisPortugalPortugal 201134 EPSP synthase inhibitors (G/9)
61Horseweed7824
89 January 13, 2014Xanthium strumariumUnited States (Illinois) United StatesIllinois199845 ALS inhibitors (B/2)
174Common cocklebur7858
90 January 8, 2014Conyza canadensisUnited States (Wisconsin) United StatesWisconsin201345 EPSP synthase inhibitors (G/9)
61Horseweed7823
91 January 8, 2014Ambrosia trifidaUnited States (Wisconsin) United StatesWisconsin201345 ALS inhibitors (B/2)
184Giant Ragweed7822
92 January 8, 2014Apera spica-ventiLithuaniaLithuania 2013185 ALS inhibitors (B/2)
20Silky Windgrass7821
93 January 8, 2014Echinochloa crusgalli var. zelayensisChinaChina 20139 Synthetic Auxins (O/4)
305Gulf Cockspur Grass7817
94 January 8, 2014Cyperus brevifoliusJapanJapan 201025 ALS inhibitors (B/2)
303Shortleaf Spikesedge7798
95 January 8, 2014Schoenoplectus wallichiiJapanJapan 200025 ALS inhibitors (B/2)
299Taiwan-yamai7790
96 January 8, 2014Rotala pusillaJapanJapan 200725 ALS inhibitors (B/2)
301Mizu-matsuba7794
97 January 8, 2014Alisma canaliculatumJapanJapan 200725 ALS inhibitors (B/2)
300Hera-omodaka7793
98 January 8, 2014Sagittaria pygmaeaJapanJapan 200625 ALS inhibitors (B/2)
230Dwarf Arrowhead7792
99 January 7, 2014Phalaris minorIndiaIndia 201321 ALS inhibitors (B/2)
127Little seed Canary grass7816
100 January 7, 2014Phalaris minorIndiaIndia 199421 ACCase inhibitors (A/1)
127Little seed Canary grass7815
101 January 7, 2014Echinochloa crus-galli var. crus-galliUruguayUruguay 201373 ALS inhibitors (B/2)
79Barnyardgrass7813
102 January 5, 2014Galium aparineTurkeyTurkey 200871 ALS inhibitors (B/2)
272Catchweed Bedstraw7814
103 January 4, 2014Amaranthus hybridusUnited States (Illinois) United StatesIllinois199845 ALS inhibitors (B/2)
12Smooth Pigweed7859
104 January 3, 2014Echinochloa crus-galli var. crus-galliUruguayUruguay 201373 Synthetic Auxins (O/4)
79Barnyardgrass7812
105 January 3, 2014Poa annuaUnited States (California) United StatesCalifornia201345 EPSP synthase inhibitors (G/9)
130Annual Bluegrass7805
106 January 3, 2014Amaranthus hybridusUnited States (Illinois) United StatesIllinois200045 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
12Smooth Pigweed7860
107 January 2, 2014Kochia scopariaUnited States (Montana) United StatesMontana201345 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia7810
108 January 2, 2014Lolium perenne ssp. multiflorumUnited States (Missouri) United StatesMissouri201345 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
110Italian Ryegrass7809
109 January 2, 2014Ambrosia trifidaUnited States (Missouri) United StatesMissouri201145 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
184Giant Ragweed7808
110 January 2, 2014Amaranthus tuberculatus (=A. rudis)United States (Missouri) United StatesMissouri200945 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
219Tall Waterhemp7807
111 January 2, 2014Conyza canadensisUnited States (Kansas) United StatesKansas201145 ALS inhibitors (B/2)
61Horseweed7806
112 December 30, 2013Setaria viridisUnited States (Montana) United StatesMontana200545 ACCase inhibitors (A/1)
153Green Foxtail7804
113 December 29, 2013Amaranthus tuberculatus (=A. rudis)United States (Minnesota) United StatesMinnesota200745 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
219Tall Waterhemp7803
114 December 29, 2013Amaranthus palmeriUnited States (Georgia) United StatesGeorgia201045 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth7788
115 December 29, 2013Amaranthus tuberculatus (=A. rudis)United States (Minnesota) United StatesMinnesota199445 ALS inhibitors (B/2)
219Tall Waterhemp7802
116 December 29, 2013Ambrosia artemisiifoliaUnited States (Minnesota) United StatesMinnesota201045 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
18Common Ragweed7801
117 December 29, 2013Bacopa rotundifoliaJapanJapan 200725 ALS inhibitors (B/2)
213Disc Waterhyssop7800
118 December 29, 2013Echinochloa crus-galli var. formosensisJapanJapan 200925 ACCase inhibitors (A/1)
304Taiwan barnyardgrass7799
119 December 28, 2013Dopatrium junceumJapanJapan 200725 ALS inhibitors (B/2)
302Dopatrium7795
120 December 28, 2013Ammannia coccineaJapanJapan 200425 ALS inhibitors (B/2)
209Redstem7791
121 December 28, 2013Gamochaeta pensylvanicaJapanJapan 199225 PSI Electron Diverter (D/22)
298Pennsylvania Everlasting7789
122 December 20, 2013Digitaria sanguinalisUnited States (Georgia) United StatesGeorgia200845 ACCase inhibitors (A/1)
77Large Crabgrass7787
123 December 19, 2013Amaranthus palmeriUnited States (Pennsylvania) United StatesPennsylvania201345 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7779
124 December 19, 2013Echinochloa crus-galli var. crus-galliUnited States (Louisiana) United StatesLouisiana201345 ALS inhibitors (B/2)
79Barnyardgrass7786
125 December 19, 2013Cyperus iriaUnited States (Louisiana) United StatesLouisiana201345 ALS inhibitors (B/2)
266Rice Flatsedge7785
126 December 19, 2013Ambrosia artemisiifoliaUnited States (Alabama) United StatesAlabama201345 EPSP synthase inhibitors (G/9)
18Common Ragweed7784
127 December 19, 2013Conyza canadensisUnited States (Alabama) United StatesAlabama201345 EPSP synthase inhibitors (G/9)
61Horseweed7783
128 December 19, 2013Lolium perenne ssp. multiflorumUnited States (South Carolina) United StatesSouth Carolina201045 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
110Italian Ryegrass7782
129 December 19, 2013Amaranthus palmeriUnited States (South Carolina) United StatesSouth Carolina201045 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
14Palmer Amaranth7781
130 December 19, 2013Amaranthus palmeriUnited States (South Carolina) United StatesSouth Carolina200645 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7780
131 December 19, 2013Ambrosia artemisiifoliaUnited States (Pennsylvania) United StatesPennsylvania200845 EPSP synthase inhibitors (G/9)
18Common Ragweed7778
132 March 6, 2004Picris hieracioidesRussiaRussia 200065 ALS inhibitors (B/2)
314Hawkweed Oxtongue7894
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