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 April 3, 2014Convolvulus arvensisJordanJordan 201155 PSI Electron Diverter (D/22)
312Field Bindweed7890
2 March 31, 2014Stellaria mediaUnited States (Pennsylvania) United StatesPennsylvania201045 ALS inhibitors (B/2)
168Common Chickweed7898
3 March 7, 2014Echinochloa crus-galli var. crus-galliEgyptEgypt 200915 ACCase inhibitors (A/1)
79Barnyardgrass7897
4 March 7, 2014Echinochloa colonaEgyptEgypt 201215 ALS inhibitors (B/2)
78Junglerice7896
5 March 7, 2014Raphanus raphanistrumBrazilBrazil 20135 ALS inhibitors (B/2)
141Wild Radish7895
6 March 4, 2014Polypogon fugaxChinaChina 20149 ACCase inhibitors (A/1)
313Asia Minor bluegrass7893
7 February 13, 2014Sonchus oleraceusAustralia (New South Wales ) AustraliaNew South Wales 20141 EPSP synthase inhibitors (G/9)
164Annual Sowthistle7892
8 February 13, 2014Lolium perenne ssp. multiflorumUnited States (Kentucky) United StatesKentucky201345 ALS inhibitors (B/2)
110Italian Ryegrass7891
9 February 7, 2014Matricaria recutita (= M. chamomilla)BelgiumBelgium 20123 ALS inhibitors (B/2)
248Wild Chamomile7889
10 February 7, 2014Eleusine indicaMalaysiaMalaysia 200928 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
Glutamine synthase inhibitors (H/10)
81Goosegrass7873
11 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
12 February 2, 2014Eleusine indicaBoliviaBolivia 20074 EPSP synthase inhibitors (G/9)
81Goosegrass7887
13 February 2, 2014Echinochloa colonaCosta RicaCosta Rica 201311 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
78Junglerice7886
14 January 30, 2014Oryza sativaCosta RicaCosta Rica 201011 ALS inhibitors (B/2)
242Red Rice7885
15 January 29, 2014Eleusine indicaCosta RicaCosta Rica 201011 EPSP synthase inhibitors (G/9)
81Goosegrass7884
16 January 28, 2014Stellaria mediaUnited States (Kentucky) United StatesKentucky201345 ALS inhibitors (B/2)
168Common Chickweed7883
17 January 28, 2014Amaranthus palmeriUnited States (Kentucky) United StatesKentucky201045 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7882
18 January 28, 2014Amaranthus tuberculatus (=A. rudis)United States (Kentucky) United StatesKentucky201045 EPSP synthase inhibitors (G/9)
219Tall Waterhemp7881
19 January 27, 2014Clidemia hirtaMalaysiaMalaysia 201028 ALS inhibitors (B/2)
311Soapbush7876
20 January 27, 2014Hedyotis verticillataMalaysiaMalaysia 200528 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
310Woody borreria7872
21 January 24, 2014Alopecurus myosuroidesCzech RepublicCzech Republic 200812 ALS inhibitors (B/2)
6Blackgrass7871
22 January 24, 2014Amaranthus palmeriUnited States (Florida) United StatesFlorida201345 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7869
23 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
24 January 23, 2014Kochia scopariaUnited States (Colorado) United StatesColorado199945 Synthetic Auxins (O/4)
101Kochia7868
25 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
26 January 23, 2014Amaranthus palmeriUnited States (Illinois) United StatesIllinois201345 ALS inhibitors (B/2)
14Palmer Amaranth7866
27 January 23, 2014Conyza canadensisUnited States (Illinois) United StatesIllinois201345 ALS inhibitors (B/2)
61Horseweed7865
28 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
29 January 23, 2014Setaria faberiUnited States (Illinois) United StatesIllinois199845 ACCase inhibitors (A/1)
149Giant Foxtail7863
30 January 23, 2014Setaria faberiUnited States (Illinois) United StatesIllinois200745 ALS inhibitors (B/2)
149Giant Foxtail7862
31 January 23, 2014Sorghum bicolorUnited States (Illinois) United StatesIllinois200045 ALS inhibitors (B/2)
165Shattercane7861
32 January 22, 2014Lolium perenne ssp. multiflorumUnited States (North Carolina) United StatesNorth Carolina200945 EPSP synthase inhibitors (G/9)
110Italian Ryegrass7811
33 January 22, 2014Ambrosia artemisiifoliaUnited States (North Carolina) United StatesNorth Carolina200645 ALS inhibitors (B/2)
18Common Ragweed7857
34 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
35 January 22, 2014Leptochloa chinensisSouth KoreaSouth Korea 201227 ACCase inhibitors (A/1)
223Chinese Sprangletop7855
36 January 22, 2014Ludwigia prostrataSouth KoreaSouth Korea 201127 ALS inhibitors (B/2)
309False Loosestrife7854
37 January 22, 2014Sagittaria trifoliaSouth KoreaSouth Korea 201127 ALS inhibitors (B/2)
294Threeleaf Arrowhead7851
38 January 22, 2014Blyxa aubertiiSouth KoreaSouth Korea 200627 ALS inhibitors (B/2)
308Roundfruit Blyxa7850
39 January 22, 2014Eleocharis acicularisSouth KoreaSouth Korea 200627 ALS inhibitors (B/2)
295Needle Spikerush7849
40 January 22, 2014Schoenoplectus fluviatilisSouth KoreaSouth Korea 200427 ALS inhibitors (B/2)
307River Bulrush7848
41 January 22, 2014Raphanus raphanistrumAustralia (Victoria) AustraliaVictoria20111 Synthetic Auxins (O/4)
141Wild Radish7846
42 January 22, 2014Raphanus raphanistrumAustralia (Victoria) AustraliaVictoria20091 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
141Wild Radish7845
43 January 22, 2014Sonchus oleraceusAustralia (Victoria) AustraliaVictoria20101 ALS inhibitors (B/2)
164Annual Sowthistle7844
44 January 22, 2014Sisymbrium orientaleAustralia (Victoria) AustraliaVictoria20101 ALS inhibitors (B/2)
159Oriental Mustard7842
45 January 22, 2014Vulpia bromoidesAustralia (Victoria) AustraliaVictoria20091 Photosystem II inhibitors (C1/5)
173Squirreltail Fescue7841
46 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
47 January 22, 2014Raphanus raphanistrumAustralia (New South Wales ) AustraliaNew South Wales 20131 Synthetic Auxins (O/4)
141Wild Radish7839
48 January 21, 2014Phalaris minorAustralia (Victoria) AustraliaVictoria20121 ACCase inhibitors (A/1)
127Little seed Canary grass7838
49 January 21, 2014Galium tricornutumAustralia (South Australia) AustraliaSouth Australia20121 ALS inhibitors (B/2)
306Threehorn Bedstraw7837
50 January 19, 2014Conyza canadensisUnited States (Indiana) United StatesIndiana200545 ALS inhibitors (B/2)
61Horseweed7836
51 January 19, 2014Amaranthus palmeriUnited States (Indiana) United StatesIndiana201245 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7835
52 January 19, 2014Kochia scopariaCanada (Saskatchewan) CanadaSaskatchewan20127 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia7834
53 January 19, 2014Ambrosia trifidaCanada (Ontario) CanadaOntario20117 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
184Giant Ragweed7833
54 January 19, 2014Lolium persicumCanada (Alberta) CanadaAlberta20097 ACCase inhibitors (A/1)
181Persian Darnel7832
55 January 19, 2014Salsola tragusCanada (Alberta) CanadaAlberta20077 ALS inhibitors (B/2)
147Russian-thistle7831
56 January 15, 2014Chenopodium albumSerbiaSerbia 2007245 ALS inhibitors (B/2)
47Common Lambsquarters7828
57 January 15, 2014Datura stramoniumSerbiaSerbia 2004245 ALS inhibitors (B/2)
75Jimsonweed7826
58 January 14, 2014Lolium perennePortugalPortugal 201334 EPSP synthase inhibitors (G/9)
111Perennial Ryegrass7825
59 January 14, 2014Conyza canadensisPortugalPortugal 201134 EPSP synthase inhibitors (G/9)
61Horseweed7824
60 January 13, 2014Xanthium strumariumUnited States (Illinois) United StatesIllinois199845 ALS inhibitors (B/2)
174Common cocklebur7858
61 January 8, 2014Conyza canadensisUnited States (Wisconsin) United StatesWisconsin201345 EPSP synthase inhibitors (G/9)
61Horseweed7823
62 January 8, 2014Ambrosia trifidaUnited States (Wisconsin) United StatesWisconsin201345 ALS inhibitors (B/2)
184Giant Ragweed7822
63 January 8, 2014Apera spica-ventiLithuaniaLithuania 2013185 ALS inhibitors (B/2)
20Silky Windgrass7821
64 January 8, 2014Echinochloa crusgalli var. zelayensisChinaChina 20139 Synthetic Auxins (O/4)
305Gulf Cockspur Grass7817
65 January 8, 2014Sagittaria trifoliaJapanJapan 199725 ALS inhibitors (B/2)
294Threeleaf Arrowhead7765
66 January 8, 2014Cyperus brevifoliusJapanJapan 201025 ALS inhibitors (B/2)
303Shortleaf Spikesedge7798
67 January 8, 2014Schoenoplectus wallichiiJapanJapan 200025 ALS inhibitors (B/2)
299Taiwan-yamai7790
68 January 8, 2014Mazus pumilusJapanJapan 201025 PSI Electron Diverter (D/22)
296Japanese Mazus7767
69 January 8, 2014Rotala pusillaJapanJapan 200725 ALS inhibitors (B/2)
301Mizu-matsuba7794
70 January 8, 2014Alisma canaliculatumJapanJapan 200725 ALS inhibitors (B/2)
300Hera-omodaka7793
71 January 8, 2014Sagittaria pygmaeaJapanJapan 200625 ALS inhibitors (B/2)
230Dwarf Arrowhead7792
72 January 8, 2014Monochoria vaginalisJapanJapan 199825 ALS inhibitors (B/2)
202Arrowleafed Monochoria7764
73 January 7, 2014Phalaris minorIndiaIndia 201321 ALS inhibitors (B/2)
127Little seed Canary grass7816
74 January 7, 2014Phalaris minorIndiaIndia 199421 ACCase inhibitors (A/1)
127Little seed Canary grass7815
75 January 7, 2014Echinochloa crus-galli var. crus-galliUruguayUruguay 201373 ALS inhibitors (B/2)
79Barnyardgrass7813
76 January 5, 2014Galium aparineTurkeyTurkey 200871 ALS inhibitors (B/2)
272Catchweed Bedstraw7814
77 January 4, 2014Amaranthus hybridusUnited States (Illinois) United StatesIllinois199845 ALS inhibitors (B/2)
12Smooth Pigweed7859
78 January 3, 2014Echinochloa crus-galli var. crus-galliUruguayUruguay 201373 Synthetic Auxins (O/4)
79Barnyardgrass7812
79 January 3, 2014Poa annuaUnited States (California) United StatesCalifornia201345 EPSP synthase inhibitors (G/9)
130Annual Bluegrass7805
80 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
81 January 2, 2014Kochia scopariaUnited States (Montana) United StatesMontana201345 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia7810
82 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
83 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
84 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
85 January 2, 2014Conyza canadensisUnited States (Kansas) United StatesKansas201145 ALS inhibitors (B/2)
61Horseweed7806
86 December 30, 2013Setaria viridisUnited States (Montana) United StatesMontana200545 ACCase inhibitors (A/1)
153Green Foxtail7804
87 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
88 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
89 December 29, 2013Amaranthus tuberculatus (=A. rudis)United States (Minnesota) United StatesMinnesota199445 ALS inhibitors (B/2)
219Tall Waterhemp7802
90 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
91 December 29, 2013Bacopa rotundifoliaJapanJapan 200725 ALS inhibitors (B/2)
213Disc Waterhyssop7800
92 December 29, 2013Lolium perenne ssp. multiflorumJapanJapan 201125 EPSP synthase inhibitors (G/9)
110Italian Ryegrass7770
93 December 29, 2013Echinochloa crus-galli var. crus-galliJapanJapan 201025 ACCase inhibitors (A/1)
79Barnyardgrass7769
94 December 29, 2013Echinochloa crus-galli var. formosensisJapanJapan 200925 ACCase inhibitors (A/1)
304Taiwan barnyardgrass7799
95 December 29, 2013Beckmannia syzigachneJapanJapan 201025 Microtubule inhibitors (K1/3)
31American Sloughgrass7768
96 December 28, 2013Eleocharis acicularisJapanJapan 200825 ALS inhibitors (B/2)
295Needle Spikerush7766
97 December 28, 2013Dopatrium junceumJapanJapan 200725 ALS inhibitors (B/2)
302Dopatrium7795
98 December 28, 2013Ammannia coccineaJapanJapan 200425 ALS inhibitors (B/2)
209Redstem7791
99 December 28, 2013Gamochaeta pensylvanicaJapanJapan 199225 PSI Electron Diverter (D/22)
298Pennsylvania Everlasting7789
100 December 20, 2013Digitaria sanguinalisUnited States (Georgia) United StatesGeorgia200845 ACCase inhibitors (A/1)
77Large Crabgrass7787
101 December 19, 2013Amaranthus palmeriUnited States (Pennsylvania) United StatesPennsylvania201345 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7779
102 December 19, 2013Echinochloa crus-galli var. crus-galliUnited States (Louisiana) United StatesLouisiana201345 ALS inhibitors (B/2)
79Barnyardgrass7786
103 December 19, 2013Cyperus iriaUnited States (Louisiana) United StatesLouisiana201345 ALS inhibitors (B/2)
266Rice Flatsedge7785
104 December 19, 2013Ambrosia artemisiifoliaUnited States (Alabama) United StatesAlabama201345 EPSP synthase inhibitors (G/9)
18Common Ragweed7784
105 December 19, 2013Conyza canadensisUnited States (Alabama) United StatesAlabama201345 EPSP synthase inhibitors (G/9)
61Horseweed7783
106 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
107 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
108 December 19, 2013Amaranthus palmeriUnited States (South Carolina) United StatesSouth Carolina200645 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7780
109 December 19, 2013Ambrosia artemisiifoliaUnited States (Pennsylvania) United StatesPennsylvania200845 EPSP synthase inhibitors (G/9)
18Common Ragweed7778
110 December 19, 2013Conyza canadensisUnited States (West Virginia) United StatesWest Virginia200745 EPSP synthase inhibitors (G/9)
61Horseweed7774
111 December 19, 2013Sorghum halepenseUnited States (West Virginia) United StatesWest Virginia200445 ALS inhibitors (B/2)
166Johnsongrass7775
112 December 19, 2013Amaranthus retroflexusUnited States (West Virginia) United StatesWest Virginia200045 Photosystem II inhibitors (C1/5)
16Redroot Pigweed7773
113 December 19, 2013Chenopodium albumUnited States (West Virginia) United StatesWest Virginia200045 Photosystem II inhibitors (C1/5)
47Common Lambsquarters7772
114 December 19, 2013Amaranthus palmeriUnited States (Texas) United StatesTexas201145 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7777
115 December 19, 2013Amaranthus tuberculatus (=A. rudis)United States (Texas) United StatesTexas200645 EPSP synthase inhibitors (G/9)
219Tall Waterhemp7776
116 December 17, 2013Sclerochloa kengianaChinaChina 20109 ACCase inhibitors (A/1)
297Keng Stiffgrass7771
117 December 15, 2013Tripleurospermum perforatum (=T. inodorum)United KingdomUnited Kingdom 200244 ALS inhibitors (B/2)
116Scentless Chamomile7763
118 December 15, 2013Arabidopsis thalianaUnited KingdomUnited Kingdom 198844 Photosystem II inhibitors (C1/5)
292Mouse-ear Cress7762
119 December 10, 2013Amaranthus quitensisArgentinaArgentina 201348 EPSP synthase inhibitors (G/9)
201Mucronate Pigweed6757
120 December 10, 2013Poa annuaUnited States (Tennessee) United StatesTennessee201345 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
130Annual Bluegrass6765
121 December 9, 2013Centaurea cyanusPolandPoland 201233 Synthetic Auxins (O/4)
277Cornflower6764
122 December 9, 2013Avena fatuaPolandPoland 201133 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
28Wild Oat6763
123 December 9, 2013Avena fatuaPolandPoland 201133 ALS inhibitors (B/2)
28Wild Oat6762
124 December 8, 2013Avena fatuaPolandPoland 201133 ACCase inhibitors (A/1)
28Wild Oat6761
125 December 8, 2013Alopecurus myosuroidesPolandPoland 201133 ACCase inhibitors (A/1)
6Blackgrass6760
126 December 8, 2013Apera spica-ventiPolandPoland 201233 PSII inhibitor (Ureas and amides) (C2/7)
20Silky Windgrass6759
127 December 8, 2013Apera spica-ventiPolandPoland 201133 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
20Silky Windgrass6758
128 December 2, 2013Leptochloa scabraVenezuelaVenezuela 201380 PSII inhibitor (Ureas and amides) (C2/7)
291Rough Sprangletop6756
129 November 14, 2013Kochia scopariaUnited States (Oklahoma) United StatesOklahoma201345 EPSP synthase inhibitors (G/9)
101Kochia6755
130 October 30, 2013Lolium rigidumAustralia (Western Australia) AustraliaWestern Australia20131 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
112Rigid Ryegrass6754
131 October 17, 2013Lolium perenne ssp. multiflorumUnited States (Tennessee) United StatesTennessee201245 EPSP synthase inhibitors (G/9)
110Italian Ryegrass6753
132 March 6, 2004Picris hieracioidesRussiaRussia 200065 ALS inhibitors (B/2)
314Hawkweed Oxtongue7894
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, April 16, 2014 .  Available  www.weedscience.org
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