International Survey of Herbicide-Resistant Weeds

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Status of Herbicide Resistance in Canada - Hugh Beckie : January, 2014

Western Canada (prairie provinces of Alberta, Saskatchewan, Manitoba) and Eastern Canada (primarily southwestern Ontario and Quebec) account for 88 and 12% of principal field annual crop area, respectively. Based on the proportion of total field area at prairie sites infested with herbicide-resistant (HR) weeds, it is estimated that 7.7 million ha (29% of annually cropped land in the prairies) are infested with HR weeds (eight-fold increase from 2001 to 2003), in a total field area of 9.9 million ha (37% of annually cropped land in the prairies) – over a two-fold increase. Group A/1 and/or B/2 wild oat (Avena fatua L.) are by far the most abundant and economically-damaging HR biotypes across the prairies. Numerous populations of Group B/2 wild mustard (Sinapis arvensis L.) and false cleavers (Galium spurium L.) across the prairies are also adversely impacting pulse crop (e.g., peas, lentils) production and quality. Glyphosate plus Group B/2 kochia (Kochia scoparia) is increasing rapidly across southern Alberta and Saskatchewan, primarily selected in chem-fallow or cereal-based cropped fields. In Eastern Canada (southwestern Canada), populations of glyphosate-resistant horseweed (Conyza canadensis) and giant ragweed (Ambrosia trifida) are steadily increasing (selected primarily in glyphosate-resistant corn or soybean), as are multiple-resistant populations of these species (glyphosate + Group B/2).

Herbicide Resistant Weeds in Canada
Herbicide Resistant Weeds in Canada
Herbicide Resistant Weeds in Canada
State  
Herbicide Resistant Weeds in Canada
 #SpeciesCommon NameFirst YearSite of Action

State: Alberta

  1 Stellaria mediaCommon ChickweedCanadaAlberta19887 ALS inhibitors (B/2)
481
  2 Kochia scopariaKochiaCanadaAlberta19897 ALS inhibitors (B/2)
65
  3 Avena fatuaWild OatCanadaAlberta19897 Multiple Resistance: 2 Sites of Action
Lipid Inhibitors (thiocarbamates) (N/8)
Cell elongation inhibitors (Z/8)
66
  4 Setaria viridisGreen FoxtailCanadaAlberta19897 Microtubule inhibitors (K1/3)
5071
  5 Avena fatuaWild OatCanadaAlberta19917 ACCase inhibitors (A/1)
67
  6 Sinapis arvensisWild MustardCanadaAlberta19937 ALS inhibitors (B/2)
5036
  7 Galium spuriumFalse CleaversCanadaAlberta19967 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
508
  8 Sonchus asperSpiny SowthistleCanadaAlberta19967 ALS inhibitors (B/2)
1153
  9 Setaria viridisGreen FoxtailCanadaAlberta19967 ACCase inhibitors (A/1)
5039
  10 Galeopsis tetrahitCommon HempnettleCanadaAlberta19987 Synthetic Auxins (O/4)
1154
  11 Neslia paniculataBall MustardCanadaAlberta19987 ALS inhibitors (B/2)
1155
  12 Avena fatuaWild OatCanadaAlberta19987 ALS inhibitors (B/2)
5075
  13 Avena fatuaWild OatCanadaAlberta19987 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Lipid Inhibitors (thiocarbamates) (N/8)
5076
  14 Thlaspi arvenseField PennycressCanadaAlberta20017 ALS inhibitors (B/2)
5097
  15 Galeopsis tetrahitCommon HempnettleCanadaAlberta20067 ALS inhibitors (B/2)
5320
  16 Polygonum convolvulus (=Fallopia convolvulus)Wild BuckwheatCanadaAlberta20077 ALS inhibitors (B/2)
5379
  17 Salsola tragusRussian-thistleCanadaAlberta20077 ALS inhibitors (B/2)
7831
  18 Lolium persicumPersian DarnelCanadaAlberta20097 ACCase inhibitors (A/1)
7832
  19 Crepis tectorumNarrowleaf HawksbeardCanadaAlberta20117 ALS inhibitors (B/2)
5606
  20 Capsella bursa-pastorisShepherd's-purseCanadaAlberta20117 ALS inhibitors (B/2)
5623
  21 Kochia scopariaKochiaCanadaAlberta20127 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
5592
  22 Vaccaria hispanicaCowcockleCanadaAlberta20127 ALS inhibitors (B/2)
5616

State: Manitoba

  23 Setaria viridisGreen FoxtailCanadaManitoba19887 Microtubule inhibitors (K1/3)
52
  24 Kochia scopariaKochiaCanadaManitoba19887 ALS inhibitors (B/2)
57
  25 Avena fatuaWild OatCanadaManitoba19907 ACCase inhibitors (A/1)
50
  26 Sinapis arvensisWild MustardCanadaManitoba19907 Synthetic Auxins (O/4)
55
  27 Setaria viridisGreen FoxtailCanadaManitoba19917 ACCase inhibitors (A/1)
53
  28 Sinapis arvensisWild MustardCanadaManitoba19927 ALS inhibitors (B/2)
54
  29 Setaria viridisGreen FoxtailCanadaManitoba19927 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
Microtubule inhibitors (K1/3)
5037
  30 Avena fatuaWild OatCanadaManitoba19947 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Antimicrotubule mitotic disrupter (Z/25)
51
  31 Sinapis arvensisWild MustardCanadaManitoba19947 Photosystem II inhibitors (C1/5)
56
  32 Galeopsis tetrahitCommon HempnettleCanadaManitoba19957 ALS inhibitors (B/2)
476
  33 Avena fatuaWild OatCanadaManitoba19977 ALS inhibitors (B/2)
5077
  34 Avena fatuaWild OatCanadaManitoba19977 Lipid Inhibitors (thiocarbamates) (N/8)
5078
  35 Avena fatuaWild OatCanadaManitoba19977 Multiple Resistance: 4 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Lipid Inhibitors (thiocarbamates) (N/8)
Antimicrotubule mitotic disrupter (Z/25)
5079
  36 Setaria viridisGreen FoxtailCanadaManitoba20027 ALS inhibitors (B/2)
5221
  37 Amaranthus retroflexusRedroot PigweedCanadaManitoba20027 ALS inhibitors (B/2)
5222
  38 Thlaspi arvenseField PennycressCanadaManitoba20087 ALS inhibitors (B/2)
5624
  39 Galium spuriumFalse CleaversCanadaManitoba20087 ALS inhibitors (B/2)
5629
  40 Stellaria mediaCommon ChickweedCanadaManitoba20087 ALS inhibitors (B/2)
5630
  41 Amaranthus powelliiPowell AmaranthCanadaManitoba20087 ALS inhibitors (B/2)
5631
  42 Polygonum lapathifoliumPale SmartweedCanadaManitoba20097 ALS inhibitors (B/2)
5625
  43 Kochia scopariaKochiaCanadaManitoba20147 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
9942

State: Ontario

  44 Daucus carotaWild CarrotCanadaOntario19577 Synthetic Auxins (O/4)
307
  45 Chenopodium albumCommon LambsquartersCanadaOntario19737 Photosystem II inhibitors (C1/5)
58
  46 Ambrosia artemisiifoliaCommon RagweedCanadaOntario19767 Photosystem II inhibitors (C1/5)
59
  47 Chenopodium album var. striatum (=C. strictum var. glaucophyllum)Lateflowering GoosefootCanadaOntario19767 Photosystem II inhibitors (C1/5)
60
  48 Amaranthus powelliiPowell AmaranthCanadaOntario19777 Photosystem II inhibitors (C1/5)
1158
  49 Senecio vulgarisCommon GroundselCanadaOntario19777 Photosystem II inhibitors (C1/5)
5066
  50 Amaranthus retroflexusRedroot PigweedCanadaOntario19807 Photosystem II inhibitors (C1/5)
61
  51 Echinochloa crus-galli var. crus-galliBarnyardgrassCanadaOntario19817 Photosystem II inhibitors (C1/5)
62
  52 Panicum capillareWitchgrassCanadaOntario19817 Photosystem II inhibitors (C1/5)
63
  53 Setaria pumila (=S. glauca)Yellow FoxtailCanadaOntario19817 Photosystem II inhibitors (C1/5)
64
  54 Sinapis arvensisWild MustardCanadaOntario19837 Photosystem II inhibitors (C1/5)
5065
  55 Conyza canadensisHorseweedCanadaOntario19937 PSI Electron Diverter (D/22)
48
  56 Lepidium virginicumVirginia PepperweedCanadaOntario19937 PSI Electron Diverter (D/22)
49
  57 Amaranthus powelliiPowell AmaranthCanadaOntario19987 ALS inhibitors (B/2)
1159
  58 Amaranthus retroflexusRedroot PigweedCanadaOntario19987 ALS inhibitors (B/2)
1161
  59 Amaranthus powelliiPowell AmaranthCanadaOntario19987 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
5049
  60 Amaranthus powelliiPowell AmaranthCanadaOntario19997 Multiple Resistance: 2 Sites of Action
Photosystem II inhibitors (C1/5)
PSII inhibitor (Ureas and amides) (C2/7)
5048
  61 Solanum ptycanthumEastern Black NightshadeCanadaOntario20007 ALS inhibitors (B/2)
5211
  62 Ambrosia artemisiifoliaCommon RagweedCanadaOntario20007 ALS inhibitors (B/2)
5471
  63 Chenopodium albumCommon LambsquartersCanadaOntario20017 ALS inhibitors (B/2)
5123
  64 Setaria viridisGreen FoxtailCanadaOntario20017 ALS inhibitors (B/2)
5124
  65 Amaranthus retroflexusRedroot PigweedCanadaOntario20017 PSII inhibitor (Ureas and amides) (C2/7)
5125
  66 Amaranthus tuberculatus (=A. rudis)Tall WaterhempCanadaOntario20027 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
5212
  67 Amaranthus tuberculatus (=A. rudis)Tall WaterhempCanadaOntario20027 ALS inhibitors (B/2)
5213
  68 Setaria faberiGiant FoxtailCanadaOntario20037 ALS inhibitors (B/2)
5210
  69 Amaranthus hybridus (syn: quitensis)Smooth PigweedCanadaOntario20047 PSII inhibitors (Nitriles) (C3/6)
5472
  70 Amaranthus retroflexusRedroot PigweedCanadaOntario20057 PSII inhibitors (Nitriles) (C3/6)
5473
  71 Ambrosia trifidaGiant RagweedCanadaOntario20087 EPSP synthase inhibitors (G/9)
5483
  72 Solanum ptycanthumEastern Black NightshadeCanadaOntario20097 PSI Electron Diverter (D/22)
5493
  73 Conyza canadensisHorseweedCanadaOntario20107 EPSP synthase inhibitors (G/9)
5665
  74 Conyza canadensisHorseweedCanadaOntario20117 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
5666
  75 Digitaria sanguinalisLarge CrabgrassCanadaOntario20117 ACCase inhibitors (A/1)
5678
  76 Ambrosia trifidaGiant RagweedCanadaOntario20117 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
7833
  77 Ambrosia artemisiifoliaCommon RagweedCanadaOntario20127 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
5713
  78 Amaranthus tuberculatus (=A. rudis)Tall WaterhempCanadaOntario20147 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
9940

State: Quebec

  79 Brassica rapa (=B. campestris)Birdsrape MustardCanadaQuebec19777 Photosystem II inhibitors (C1/5)
433
  80 Ambrosia artemisiifoliaCommon RagweedCanadaQuebec19997 PSII inhibitor (Ureas and amides) (C2/7)
5064
  81 Amaranthus retroflexusRedroot PigweedCanadaQuebec20017 PSII inhibitor (Ureas and amides) (C2/7)
5126

State: Saskatchewan

  82 Kochia scopariaKochiaCanadaSaskatchewan19887 ALS inhibitors (B/2)
5069
  83 Salsola tragusRussian-thistleCanadaSaskatchewan19897 ALS inhibitors (B/2)
5067
  84 Avena fatuaWild OatCanadaSaskatchewan19907 ACCase inhibitors (A/1)
5041
  85 Setaria viridisGreen FoxtailCanadaSaskatchewan19917 Microtubule inhibitors (K1/3)
5040
  86 Setaria viridisGreen FoxtailCanadaSaskatchewan19967 ACCase inhibitors (A/1)
5038
  87 Setaria viridisGreen FoxtailCanadaSaskatchewan19967 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
Microtubule inhibitors (K1/3)
5070
  88 Avena fatuaWild OatCanadaSaskatchewan19967 ALS inhibitors (B/2)
5072
  89 Avena fatuaWild OatCanadaSaskatchewan19967 Lipid Inhibitors (thiocarbamates) (N/8)
5073
  90 Avena fatuaWild OatCanadaSaskatchewan19967 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Lipid Inhibitors (thiocarbamates) (N/8)
5074
  91 Sinapis arvensisWild MustardCanadaSaskatchewan20027 ALS inhibitors (B/2)
5243
  92 Lolium persicumPersian DarnelCanadaSaskatchewan20047 ACCase inhibitors (A/1)
5244
  93 Stellaria mediaCommon ChickweedCanadaSaskatchewan20057 ALS inhibitors (B/2)
5322
  94 Galium spuriumFalse CleaversCanadaSaskatchewan20067 ALS inhibitors (B/2)
5321
  95 Capsella bursa-pastorisShepherd's-purseCanadaSaskatchewan20087 ALS inhibitors (B/2)
5381
  96 Thlaspi arvenseField PennycressCanadaSaskatchewan20097 ALS inhibitors (B/2)
5626
  97 Chenopodium albumCommon LambsquartersCanadaSaskatchewan20097 ALS inhibitors (B/2)
5627
  98 Amaranthus retroflexusRedroot PigweedCanadaSaskatchewan20107 ALS inhibitors (B/2)
5628
  99 Kochia scopariaKochiaCanadaSaskatchewan20127 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
7834
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, July 29, 2015 .  Available  www.weedscience.org
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