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 1, 2015Matricaria recutita (= M. chamomilla)PolandPoland 201433 ALS inhibitors (B/2)
248Wild Chamomile10984
2 March 31, 2015Papaver rhoeasPolandPoland 201433 ALS inhibitors (B/2)
123Corn Poppy10983
3 March 27, 2015Poa annuaUnited States (Mississippi) United StatesMississippi201445 ALS inhibitors (B/2)
130Annual Bluegrass10982
4 March 25, 2015Ambrosia artemisiifoliaUnited States (Wisconsin) United StatesWisconsin201345 ALS inhibitors (B/2)
18Common Ragweed10981
5 March 20, 2015Amaranthus tuberculatus (=A. rudis)United States (Arkansas) United StatesArkansas201545 EPSP synthase inhibitors (G/9)
219Tall Waterhemp10980
6 March 16, 2015Sorghum halepenseArgentinaArgentina 201548 ACCase inhibitors (A/1)
166Johnsongrass10979
7 March 9, 2015Alopecurus myosuroidesNetherlandsNetherlands 201043 ALS inhibitors (B/2)
6Blackgrass10978
8 March 9, 2015Polygonum persicariaNorwayNorway 200931 ALS inhibitors (B/2)
136Ladysthumb10977
9 March 9, 2015Sonchus asperNorwayNorway 200631 ALS inhibitors (B/2)
163Spiny Sowthistle10976
10 March 9, 2015Tripleurospermum perforatum (=T. inodorum)NorwayNorway 200631 ALS inhibitors (B/2)
116Scentless Chamomile10975
11 March 9, 2015Spergula arvensisNorwayNorway 200631 ALS inhibitors (B/2)
326Corn Spurry10974
12 March 2, 2015Kochia scopariaUnited States (Kansas) United StatesKansas201345 Multiple Resistance: 2 Sites of Action
EPSP synthase inhibitors (G/9)
Synthetic Auxins (O/4)
101Kochia10973
13 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
14 March 31, 2015Tripleurospermum perforatum (=T. inodorum)PolandPoland 201433 ALS inhibitors (B/2)
116Scentless Chamomile10971
15 February 24, 2015Lamium amplexicauleUnited States (Kansas) United StatesKansas201445 ALS inhibitors (B/2)
323Henbit Deadnettle10970
16 March 31, 2015Alopecurus myosuroidesPolandPoland 201233 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
6Blackgrass10969
17 February 24, 2015Lolium perenne ssp. multiflorumUnited KingdomUnited Kingdom 201244 ALS inhibitors (B/2)
110Italian Ryegrass10968
18 February 3, 2015Bromus rubensAustralia (Western Australia) AustraliaWestern Australia20141 EPSP synthase inhibitors (G/9)
324Red Brome10964
19 January 30, 2015Lamium amplexicauleUnited States (Kansas) United StatesKansas201445 ALS inhibitors (B/2)
323Henbit Deadnettle10963
20 January 29, 2015Bifora radiansTurkeyTurkey 200871 ALS inhibitors (B/2)
322Wild Bishop10962
21 January 28, 2015Kochia scopariaUnited States (Wyoming) United StatesWyoming201445 EPSP synthase inhibitors (G/9)
101Kochia10961
22 January 28, 2015Papaver rhoeasBelgiumBelgium 20143 ALS inhibitors (B/2)
123Corn Poppy10960
23 January 28, 2015Stellaria mediaBelgiumBelgium 20133 ALS inhibitors (B/2)
168Common Chickweed10959
24 January 26, 2015Amaranthus tuberculatus (=A. rudis)United States (Wisconsin) United StatesWisconsin201345 EPSP synthase inhibitors (G/9)
219Tall Waterhemp10958
25 January 26, 2015Amaranthus palmeriUnited States (Wisconsin) United StatesWisconsin201345 EPSP synthase inhibitors (G/9)
14Palmer Amaranth10957
26 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
27 January 20, 2015Alopecurus japonicusChinaChina 20149 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
5Japanese Foxtail10955
28 January 20, 2015Alopecurus aequalisChinaChina 20149 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
264Shortawn Foxtail10954
29 January 20, 2015Vicia sativaChinaChina 20149 ALS inhibitors (B/2)
321Common Vetch10953
30 January 20, 2015Galium aparineChinaChina 20149 Synthetic Auxins (O/4)
272Catchweed Bedstraw10952
31 January 20, 2015Phalaris brachystachysIranIran 201479 ACCase inhibitors (A/1)
244Shortspike Canarygrass10951
32 January 20, 2015Echinochloa colonaVenezuelaVenezuela 200880 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
EPSP synthase inhibitors (G/9)
78Junglerice10950
33 January 20, 2015Rumex dentatusIndiaIndia 201421 ALS inhibitors (B/2)
320Toothed Dock10949
34 January 20, 2015Leptochloa chinensisMalaysiaMalaysia 200628 PSII inhibitor (Ureas and amides) (C2/7)
223Chinese Sprangletop10948
35 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
36 January 12, 2015Ageratum conyzoidesBrazilBrazil 20135 ALS inhibitors (B/2)
319Tropical Whiteweed9947
37 January 7, 2015Stellaria mediaFinlandFinland 2013139 ALS inhibitors (B/2)
168Common Chickweed9946
38 December 29, 2014Kochia scopariaUnited States (Idaho) United StatesIdaho201445 EPSP synthase inhibitors (G/9)
101Kochia9945
39 December 26, 2014Kochia scopariaUnited States (Oregon) United StatesOregon201445 EPSP synthase inhibitors (G/9)
101Kochia9944
40 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
41 December 9, 2014Kochia scopariaCanada (Manitoba) CanadaManitoba20147 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia9942
42 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
43 November 25, 2014Tripleurospermum perforatum (=T. inodorum)FranceFrance 201017 ALS inhibitors (B/2)
116Scentless Chamomile9939
44 November 25, 2014Avena fatuaFranceFrance 200617 ALS inhibitors (B/2)
28Wild Oat9938
45 November 25, 2014Avena sterilisFranceFrance 200617 ALS inhibitors (B/2)
29Sterile Oat9937
46 November 25, 2014Apera spica-ventiFranceFrance 200617 ALS inhibitors (B/2)
20Silky Windgrass9936
47 November 25, 2014Echinochloa phyllopogon (=E. oryzicola)FranceFrance 201317 ALS inhibitors (B/2)
178Late Watergrass9935
48 November 25, 2014Echinochloa crus-galli var. crus-galliFranceFrance 201317 ALS inhibitors (B/2)
79Barnyardgrass9934
49 November 25, 2014Setaria viridisFranceFrance 201117 ALS inhibitors (B/2)
153Green Foxtail9933
50 November 25, 2014Conyza sumatrensisFranceFrance 201017 EPSP synthase inhibitors (G/9)
65Sumatran Fleabane9932
51 November 25, 2014Bromus sterilisFranceFrance 200917 ALS inhibitors (B/2)
289Poverty Brome9931
52 November 25, 2014Helianthus annuusFranceFrance 200917 ALS inhibitors (B/2)
95Common Sunflower9929
53 November 13, 2014Chenopodium albumSwedenSweden 200540 Photosystem II inhibitors (C1/5)
47Common Lambsquarters9928
54 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
55 November 6, 2014Kochia scopariaUnited States (Nebraska) United StatesNebraska201445 Photosystem II inhibitors (C1/5)
101Kochia9926
56 October 17, 2014Ixophorus unisetusMexicoMexico 201429 ALS inhibitors (B/2)
100Pasto Honduras (Mexicangrass)9925
57 October 14, 2014Schoenoplectus mucronatus (=Scirpus mucronatus)United States (California) United StatesCalifornia201445 PSII inhibitor (Ureas and amides) (C2/7)
182Ricefield Bulrush9924
58 October 15, 2014Bidens pilosaMexicoMexico 201429 EPSP synthase inhibitors (G/9)
32Hairy Beggarticks9923
59 September 29, 2014Amaranthus palmeriUnited States (New Jersey) United StatesNew Jersey201445 EPSP synthase inhibitors (G/9)
14Palmer Amaranth9922
60 September 11, 2014Amaranthus palmeriIsraelIsrael 200823 ALS inhibitors (B/2)
14Palmer Amaranth9921
61 September 1, 2014Brachiaria eruciformisAustralia (Queensland) AustraliaQueensland20141 EPSP synthase inhibitors (G/9)
318Sweet Summer Grass8921
62 February 24, 2015Cyperus odoratusVenezuelaVenezuela 201480 ALS inhibitors (B/2)
317Fragrant Flatsedge8920
63 July 8, 2014Amaranthus tuberculatus (=A. rudis)United States (Indiana) United StatesIndiana201445 PPO inhibitors (E/14)
219Tall Waterhemp8919
64 June 26, 2014Chloris elataBrazilBrazil 20145 EPSP synthase inhibitors (G/9)
316Tall Windmill Grass8918
65 June 11, 2014Ambrosia artemisiifoliaUnited States (Nebraska) United StatesNebraska201345 EPSP synthase inhibitors (G/9)
18Common Ragweed8917
66 May 29, 2014Ambrosia artemisiifoliaUnited States (New Jersey) United StatesNew Jersey201345 EPSP synthase inhibitors (G/9)
18Common Ragweed8916
67 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
68 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
69 May 12, 2014Papaver rhoeasSwedenSweden 201140 ALS inhibitors (B/2)
123Corn Poppy8913
70 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
71 May 12, 2014Alopecurus myosuroidesSwedenSweden 201140 ACCase inhibitors (A/1)
6Blackgrass8911
72 May 12, 2014Capsella bursa-pastorisDenmarkDenmark 201213 ALS inhibitors (B/2)
41Shepherd's-purse8910
73 May 8, 2014Echinochloa erectaItalyItaly 200524 PSII inhibitor (Ureas and amides) (C2/7)
236Pollacci Barnyardgrass8909
74 May 8, 2014Avena sterilisItalyItaly 200724 ALS inhibitors (B/2)
29Sterile Oat8908
75 May 8, 2014Lolium perenne ssp. multiflorumItalyItaly 200524 ALS inhibitors (B/2)
110Italian Ryegrass8907
76 May 8, 2014Lolium perenne ssp. multiflorumItalyItaly 199524 ACCase inhibitors (A/1)
110Italian Ryegrass8906
77 May 8, 2014Sorghum halepenseItalyItaly 200724 ALS inhibitors (B/2)
166Johnsongrass8905
78 May 8, 2014Echinochloa crus-galli var. crus-galliItalyItaly 201124 ACCase inhibitors (A/1)
79Barnyardgrass8904
79 May 8, 2014Lolium perenne ssp. multiflorumItalyItaly 201224 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
110Italian Ryegrass8903
80 May 8, 2014Lolium perenne ssp. multiflorumItalyItaly 200824 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
EPSP synthase inhibitors (G/9)
110Italian Ryegrass8902
81 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
82 April 29, 2014Ambrosia artemisiifoliaUnited States (Mississippi) United StatesMississippi201445 EPSP synthase inhibitors (G/9)
18Common Ragweed8900
83 February 3, 2015Ehrharta longifloraAustralia (Western Australia) AustraliaWestern Australia20141 ACCase inhibitors (A/1)
315Longflowered veldtgrass 8899
84 April 16, 2014Lolium perenne ssp. multiflorumUnited States (Louisiana) United StatesLouisiana201445 EPSP synthase inhibitors (G/9)
110Italian Ryegrass8898
85 March 31, 2014Stellaria mediaUnited States (Pennsylvania) United StatesPennsylvania201045 ALS inhibitors (B/2)
168Common Chickweed7898
86 March 7, 2014Echinochloa crus-galli var. crus-galliEgyptEgypt 200915 ACCase inhibitors (A/1)
79Barnyardgrass7897
87 March 7, 2014Echinochloa colonaEgyptEgypt 201215 ALS inhibitors (B/2)
78Junglerice7896
88 March 7, 2014Raphanus raphanistrumBrazilBrazil 20135 ALS inhibitors (B/2)
141Wild Radish7895
89 March 6, 2004Picris hieracioidesRussiaRussia 200065 ALS inhibitors (B/2)
314Hawkweed Oxtongue7894
90 March 4, 2014Polypogon fugaxChinaChina 20149 ACCase inhibitors (A/1)
313Asia Minor bluegrass7893
91 February 3, 2015Sonchus oleraceusAustralia (New South Wales ) AustraliaNew South Wales 20141 EPSP synthase inhibitors (G/9)
164Annual Sowthistle7892
92 February 13, 2014Lolium perenne ssp. multiflorumUnited States (Kentucky) United StatesKentucky201345 ALS inhibitors (B/2)
110Italian Ryegrass7891
93 April 3, 2014Convolvulus arvensisJordanJordan 201155 PSI Electron Diverter (D/22)
312Field Bindweed7890
94 January 28, 2015Matricaria recutita (= M. chamomilla)BelgiumBelgium 20123 ALS inhibitors (B/2)
248Wild Chamomile7889
95 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
96 February 2, 2014Eleusine indicaBoliviaBolivia 20074 EPSP synthase inhibitors (G/9)
81Goosegrass7887
97 February 2, 2014Echinochloa colonaCosta RicaCosta Rica 201311 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
78Junglerice7886
98 January 30, 2014Oryza sativa var. sylvaticaCosta RicaCosta Rica 201011 ALS inhibitors (B/2)
242Red Rice7885
99 January 29, 2014Eleusine indicaCosta RicaCosta Rica 201011 EPSP synthase inhibitors (G/9)
81Goosegrass7884
100 January 28, 2014Stellaria mediaUnited States (Kentucky) United StatesKentucky201345 ALS inhibitors (B/2)
168Common Chickweed7883
101 January 28, 2014Amaranthus palmeriUnited States (Kentucky) United StatesKentucky201045 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7882
102 January 28, 2014Amaranthus tuberculatus (=A. rudis)United States (Kentucky) United StatesKentucky201045 EPSP synthase inhibitors (G/9)
219Tall Waterhemp7881
103 January 27, 2014Clidemia hirtaMalaysiaMalaysia 201028 ALS inhibitors (B/2)
311Soapbush7876
104 February 7, 2014Eleusine indicaMalaysiaMalaysia 200928 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
Glutamine synthase inhibitors (H/10)
81Goosegrass7873
105 January 27, 2014Hedyotis verticillataMalaysiaMalaysia 200528 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
310Woody borreria7872
106 January 24, 2014Alopecurus myosuroidesCzech RepublicCzech Republic 200812 ALS inhibitors (B/2)
6Blackgrass7871
107 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
108 January 24, 2014Amaranthus palmeriUnited States (Florida) United StatesFlorida201345 EPSP synthase inhibitors (G/9)
14Palmer Amaranth7869
109 January 23, 2014Kochia scopariaUnited States (Colorado) United StatesColorado199945 Synthetic Auxins (O/4)
101Kochia7868
110 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
111 January 23, 2014Amaranthus palmeriUnited States (Illinois) United StatesIllinois201345 ALS inhibitors (B/2)
14Palmer Amaranth7866
112 January 23, 2014Conyza canadensisUnited States (Illinois) United StatesIllinois201345 ALS inhibitors (B/2)
61Horseweed7865
113 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
114 January 23, 2014Setaria faberiUnited States (Illinois) United StatesIllinois199845 ACCase inhibitors (A/1)
149Giant Foxtail7863
115 January 23, 2014Setaria faberiUnited States (Illinois) United StatesIllinois200745 ALS inhibitors (B/2)
149Giant Foxtail7862
116 January 23, 2014Sorghum bicolorUnited States (Illinois) United StatesIllinois200045 ALS inhibitors (B/2)
165Shattercane7861
117 January 3, 2014Amaranthus hybridus (syn: quitensis)United States (Illinois) United StatesIllinois200045 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
12Smooth Pigweed7860
118 January 4, 2014Amaranthus hybridus (syn: quitensis)United States (Illinois) United StatesIllinois199845 ALS inhibitors (B/2)
12Smooth Pigweed7859
119 January 13, 2014Xanthium strumariumUnited States (Illinois) United StatesIllinois199845 ALS inhibitors (B/2)
174Common cocklebur7858
120 January 22, 2014Ambrosia artemisiifoliaUnited States (North Carolina) United StatesNorth Carolina200645 ALS inhibitors (B/2)
18Common Ragweed7857
121 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
122 January 22, 2014Leptochloa chinensisSouth KoreaSouth Korea 201227 ACCase inhibitors (A/1)
223Chinese Sprangletop7855
123 January 22, 2014Ludwigia prostrataSouth KoreaSouth Korea 201127 ALS inhibitors (B/2)
309False Loosestrife7854
124 January 22, 2014Sagittaria trifoliaSouth KoreaSouth Korea 201127 ALS inhibitors (B/2)
294Threeleaf Arrowhead7851
125 January 22, 2014Blyxa aubertiiSouth KoreaSouth Korea 200627 ALS inhibitors (B/2)
308Roundfruit Blyxa7850
126 January 22, 2014Eleocharis acicularisSouth KoreaSouth Korea 200627 ALS inhibitors (B/2)
295Needle Spikerush7849
127 January 22, 2014Schoenoplectus fluviatilisSouth KoreaSouth Korea 200427 ALS inhibitors (B/2)
307River Bulrush7848
128 January 22, 2014Raphanus raphanistrumAustralia (Victoria) AustraliaVictoria20111 Synthetic Auxins (O/4)
141Wild Radish7846
129 January 22, 2014Raphanus raphanistrumAustralia (Victoria) AustraliaVictoria20091 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
141Wild Radish7845
130 January 22, 2014Sonchus oleraceusAustralia (Victoria) AustraliaVictoria20101 ALS inhibitors (B/2)
164Annual Sowthistle7844
131 January 22, 2014Sisymbrium orientaleAustralia (Victoria) AustraliaVictoria20101 ALS inhibitors (B/2)
159Oriental Mustard7842
132 January 22, 2014Vulpia bromoidesAustralia (Victoria) AustraliaVictoria20091 Photosystem II inhibitors (C1/5)
173Squirreltail Fescue7841
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, April 1, 2015 .  Available  www.weedscience.org
Copyright © 1993- 2015 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.