select Select by Country Argentina Australia Austria Belgium Bolivia Brazil Bulgaria Canada Chile China Colombia Costa Rica Cyprus Czech Republic Denmark Ecuador Egypt El Salvador Ethiopia Fiji Finland France Germany Greece Guatemala Honduras Hungary India Indonesia Iran Ireland Israel Italy Japan Jordan Kazakhstan Kenya Latvia Lithuania Malaysia Mexico Netherlands New Zealand Nicaragua Norway Pakistan Panama Paraguay Philippines Poland Portugal Russia Saudi Arabia Serbia Slovenia South Africa South Korea Spain Sri Lanka Sweden Switzerland Syria Taiwan Thailand Tunisia Turkey Ukraine United Kingdom United States Uruguay Venezuela

Herbicide Resistant Weeds in Canada
Herbicide Resistant Weeds in Canada Herbicide Resistant Weeds in Canada State

Herbicide Resistant Weeds in Canada

	#	Species	Common Name	Country	State Name	First Year	CountryID	Site of Action	ResistID
	State: Alberta
	1	Stellaria media	Common Chickweed	Canada	Alberta	1988	7	Inhibition of Acetolactate Synthase (B/2)	481
	2	Kochia scoparia	Kochia	Canada	Alberta	1989	7	Inhibition of Acetolactate Synthase (B/2)	65
	3	Avena fatua	Wild Oat	Canada	Alberta	1989	7	Multiple Resistance: 2 Sites of Action Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/8) Cell elongation inhibitors (Z/8)	66
	4	Setaria viridis	Green Foxtail	Canada	Alberta	1989	7	Inhibition of Microtubule Assembly 2 (K1/3)	5071
	5	Avena fatua	Wild Oat	Canada	Alberta	1991	7	Inhibition of Acetyl CoA Carboxylase (A/1)	67
	6	Sinapis arvensis	Wild Mustard	Canada	Alberta	1993	7	Inhibition of Acetolactate Synthase (B/2)	5036
	7	Galium spurium	False Cleavers	Canada	Alberta	1996	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) Auxin Mimics (O/4)	508
	8	Sonchus asper	Spiny Sowthistle	Canada	Alberta	1996	7	Inhibition of Acetolactate Synthase (B/2)	1153
	9	Setaria viridis	Green Foxtail	Canada	Alberta	1996	7	Inhibition of Acetyl CoA Carboxylase (A/1)	5039
	10	Galeopsis tetrahit	Common Hempnettle	Canada	Alberta	1998	7	Auxin Mimics (O/4)	1154
	11	Neslia paniculata	Ball Mustard	Canada	Alberta	1998	7	Inhibition of Acetolactate Synthase (B/2)	1155
	12	Avena fatua	Wild Oat	Canada	Alberta	1998	7	Inhibition of Acetolactate Synthase (B/2)	5075
	13	Avena fatua	Wild Oat	Canada	Alberta	1998	7	Multiple Resistance: 3 Sites of Action Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetolactate Synthase (B/2) Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/8)	5076
	14	Thlaspi arvense	Field Pennycress	Canada	Alberta	2001	7	Inhibition of Acetolactate Synthase (B/2)	5097
	15	Galeopsis tetrahit	Common Hempnettle	Canada	Alberta	2006	7	Inhibition of Acetolactate Synthase (B/2)	5320
	16	Polygonum convolvulus (=Fallopia convolvulus)	Wild Buckwheat	Canada	Alberta	2007	7	Inhibition of Acetolactate Synthase (B/2)	5379
	17	Salsola tragus	Russian-thistle	Canada	Alberta	2007	7	Inhibition of Acetolactate Synthase (B/2)	7831
	18	Lolium persicum	Persian Darnel	Canada	Alberta	2009	7	Inhibition of Acetyl CoA Carboxylase (A/1)	7832
	19	Crepis tectorum	Narrowleaf Hawksbeard	Canada	Alberta	2011	7	Inhibition of Acetolactate Synthase (B/2)	5606
	20	Capsella bursa-pastoris	Shepherd's-purse	Canada	Alberta	2011	7	Inhibition of Acetolactate Synthase (B/2)	5623
	21	Kochia scoparia	Kochia	Canada	Alberta	2012	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	5592
	22	Vaccaria hispanica	Cowcockle	Canada	Alberta	2012	7	Inhibition of Acetolactate Synthase (B/2)	5616
	23	Polygonum lapathifolium	Pale Smartweed	Canada	Alberta	2014	7	Inhibition of Acetolactate Synthase (B/2)	11002
	24	Kochia scoparia	Kochia	Canada	Alberta	2017	7	Multiple Resistance: 3 Sites of Action Inhibition of Acetolactate Synthase (B/2) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Auxin Mimics (O/4)	17147
	25	Bromus tectorum	Downy Brome (Cheatgrass)	Canada	Alberta	2021	7	Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	21234
	State: British Columbia
	26	Centaurea stoebe ssp. micranthos	Spotted knapweed	Canada	British Columbia	2013	7	Auxin Mimics (O/4)	15061
	State: Manitoba
	27	Setaria viridis	Green Foxtail	Canada	Manitoba	1988	7	Inhibition of Microtubule Assembly 2 (K1/3)	52
	28	Kochia scoparia	Kochia	Canada	Manitoba	1988	7	Inhibition of Acetolactate Synthase (B/2)	57
	29	Avena fatua	Wild Oat	Canada	Manitoba	1990	7	Inhibition of Acetyl CoA Carboxylase (A/1)	50
	30	Sinapis arvensis	Wild Mustard	Canada	Manitoba	1990	7	Auxin Mimics (O/4)	55
	31	Setaria viridis	Green Foxtail	Canada	Manitoba	1991	7	Inhibition of Acetyl CoA Carboxylase (A/1)	53
	32	Sinapis arvensis	Wild Mustard	Canada	Manitoba	1992	7	Inhibition of Acetolactate Synthase (B/2)	54
	33	Setaria viridis	Green Foxtail	Canada	Manitoba	1992	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Microtubule Assembly 2 (K1/3)	5037
	34	Avena fatua	Wild Oat	Canada	Manitoba	1994	7	Multiple Resistance: 3 Sites of Action Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetolactate Synthase (B/2) Antimicrotubule mitotic disrupter (Z/25)	51
	35	Sinapis arvensis	Wild Mustard	Canada	Manitoba	1994	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	56
	36	Galeopsis tetrahit	Common Hempnettle	Canada	Manitoba	1995	7	Inhibition of Acetolactate Synthase (B/2)	476
	37	Avena fatua	Wild Oat	Canada	Manitoba	1997	7	Inhibition of Acetolactate Synthase (B/2)	5077
	38	Avena fatua	Wild Oat	Canada	Manitoba	1997	7	Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/8)	5078
	39	Avena fatua	Wild Oat	Canada	Manitoba	1997	7	Multiple Resistance: 4 Sites of Action Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetolactate Synthase (B/2) Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/8) Antimicrotubule mitotic disrupter (Z/25)	5079
	40	Setaria viridis	Green Foxtail	Canada	Manitoba	2002	7	Inhibition of Acetolactate Synthase (B/2)	5221
	41	Amaranthus retroflexus	Redroot Pigweed	Canada	Manitoba	2002	7	Inhibition of Acetolactate Synthase (B/2)	5222
	42	Thlaspi arvense	Field Pennycress	Canada	Manitoba	2008	7	Inhibition of Acetolactate Synthase (B/2)	5624
	43	Galium spurium	False Cleavers	Canada	Manitoba	2008	7	Inhibition of Acetolactate Synthase (B/2)	5629
	44	Stellaria media	Common Chickweed	Canada	Manitoba	2008	7	Inhibition of Acetolactate Synthase (B/2)	5630
	45	Amaranthus powellii	Powell Amaranth	Canada	Manitoba	2008	7	Inhibition of Acetolactate Synthase (B/2)	5631
	46	Polygonum lapathifolium	Pale Smartweed	Canada	Manitoba	2009	7	Inhibition of Acetolactate Synthase (B/2)	5625
	47	Kochia scoparia	Kochia	Canada	Manitoba	2014	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	9942
	48	Avena fatua	Wild Oat	Canada	Manitoba	2015	7	Multiple Resistance: 5 Sites of Action Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetolactate Synthase (B/2) Inhibition of Protoporphyrinogen Oxidase (E/14) Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/15) Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/8)	11033
	State: Nova Scotia
	49	Rumex acetosella	Sheep Sorrel	Canada	Nova Scotia	2011	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	17122
	State: Ontario
	50	Daucus carota	Wild Carrot	Canada	Ontario	1957	7	Auxin Mimics (O/4)	307
	51	Chenopodium album	Common Lambsquarters	Canada	Ontario	1973	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	58
	52	Ambrosia artemisiifolia	Common Ragweed	Canada	Ontario	1976	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	59
	53	Chenopodium album var. striatum (=C. strictum var. glaucophyllum)	Lateflowering Goosefoot	Canada	Ontario	1976	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	60
	54	Amaranthus powellii	Powell Amaranth	Canada	Ontario	1977	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	1158
	55	Senecio vulgaris	Common Groundsel	Canada	Ontario	1977	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	5066
	56	Amaranthus retroflexus	Redroot Pigweed	Canada	Ontario	1980	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	61
	57	Echinochloa crus-galli var. crus-galli	Barnyardgrass	Canada	Ontario	1981	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	62
	58	Panicum capillare	Witchgrass	Canada	Ontario	1981	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	63
	59	Setaria pumila (=S. glauca)	Yellow Foxtail	Canada	Ontario	1981	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	64
	60	Sinapis arvensis	Wild Mustard	Canada	Ontario	1983	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	5065
	61	Conyza canadensis	Horseweed	Canada	Ontario	1993	7	PS I Electron Diversion (D/22)	48
	62	Lepidium virginicum	Virginia Pepperweed	Canada	Ontario	1993	7	PS I Electron Diversion (D/22)	49
	63	Amaranthus powellii	Powell Amaranth	Canada	Ontario	1998	7	Inhibition of Acetolactate Synthase (B/2)	1159
	64	Amaranthus retroflexus	Redroot Pigweed	Canada	Ontario	1998	7	Inhibition of Acetolactate Synthase (B/2)	1161
	65	Amaranthus powellii	Powell Amaranth	Canada	Ontario	1998	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) PSII inhibitors - Serine 264 Binders (C1 C2/5)	5049
	66	Amaranthus powellii	Powell Amaranth	Canada	Ontario	1999	7	Multiple Resistance: 2 Sites of Action PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/7)	5048
	67	Solanum ptycanthum	Eastern Black Nightshade	Canada	Ontario	2000	7	Inhibition of Acetolactate Synthase (B/2)	5211
	68	Ambrosia artemisiifolia	Common Ragweed	Canada	Ontario	2000	7	Inhibition of Acetolactate Synthase (B/2)	5471
	69	Chenopodium album	Common Lambsquarters	Canada	Ontario	2001	7	Inhibition of Acetolactate Synthase (B/2)	5123
	70	Setaria viridis	Green Foxtail	Canada	Ontario	2001	7	Inhibition of Acetolactate Synthase (B/2)	5124
	71	Amaranthus retroflexus	Redroot Pigweed	Canada	Ontario	2001	7	PSII inhibitors - Serine 264 Binders (C1 C2/7)	5125
	72	Amaranthus tuberculatus (=A. rudis)	Tall Waterhemp	Canada	Ontario	2002	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) PSII inhibitors - Serine 264 Binders (C1 C2/5)	5212
	73	Amaranthus tuberculatus (=A. rudis)	Tall Waterhemp	Canada	Ontario	2002	7	Inhibition of Acetolactate Synthase (B/2)	5213
	74	Setaria faberi	Giant Foxtail	Canada	Ontario	2003	7	Inhibition of Acetolactate Synthase (B/2)	5210
	75	Amaranthus hybridus (syn: quitensis)	Smooth Pigweed	Canada	Ontario	2004	7	PSII inhibitors - Histidine 215 Binders (C3/6)	5472
	76	Amaranthus retroflexus	Redroot Pigweed	Canada	Ontario	2005	7	PSII inhibitors - Histidine 215 Binders (C3/6)	5473
	77	Ambrosia trifida	Giant Ragweed	Canada	Ontario	2008	7	Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	5483
	78	Solanum ptycanthum	Eastern Black Nightshade	Canada	Ontario	2009	7	PS I Electron Diversion (D/22)	5493
	79	Conyza canadensis	Horseweed	Canada	Ontario	2010	7	Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	5665
	80	Conyza canadensis	Horseweed	Canada	Ontario	2011	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	5666
	81	Digitaria sanguinalis	Large Crabgrass	Canada	Ontario	2011	7	Inhibition of Acetyl CoA Carboxylase (A/1)	5678
	82	Ambrosia trifida	Giant Ragweed	Canada	Ontario	2011	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	7833
	83	Ambrosia artemisiifolia	Common Ragweed	Canada	Ontario	2012	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	5713
	84	Amaranthus tuberculatus (=A. rudis)	Tall Waterhemp	Canada	Ontario	2014	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	9940
	85	Amaranthus tuberculatus (=A. rudis)	Tall Waterhemp	Canada	Ontario	2017	7	Multiple Resistance: 4 Sites of Action Inhibition of Acetolactate Synthase (B/2) PSII inhibitors - Serine 264 Binders (C1 C2/5) Inhibition of Protoporphyrinogen Oxidase (E/14) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	17140
	86	Amaranthus tuberculatus (=A. rudis)	Tall Waterhemp	Canada	Ontario	2017	7	Multiple Resistance: 3 Sites of Action Inhibition of Acetolactate Synthase (B/2) PSII inhibitors - Serine 264 Binders (C1 C2/5) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	17141
	87	Amaranthus tuberculatus (=A. rudis)	Tall Waterhemp	Canada	Ontario	2017	7	Multiple Resistance: 2 Sites of Action PSII inhibitors - Serine 264 Binders (C1 C2/5) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	17142
	State: Quebec
	88	Brassica rapa (=B. campestris)	Birdsrape Mustard	Canada	Quebec	1977	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	433
	89	Amaranthus retroflexus	Redroot Pigweed	Canada	Quebec	1980	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	17126
	90	Chenopodium album	Common Lambsquarters	Canada	Quebec	1980	7	PSII inhibitors - Serine 264 Binders (C1 C2/5)	17132
	91	Ambrosia artemisiifolia	Common Ragweed	Canada	Quebec	1999	7	PSII inhibitors - Serine 264 Binders (C1 C2/7)	5064
	92	Ambrosia artemisiifolia	Common Ragweed	Canada	Quebec	1999	7	Multiple Resistance: 2 Sites of Action PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/7)	17128
	93	Amaranthus retroflexus	Redroot Pigweed	Canada	Quebec	2001	7	PSII inhibitors - Serine 264 Binders (C1 C2/7)	5126
	94	Ambrosia artemisiifolia	Common Ragweed	Canada	Quebec	2007	7	Inhibition of Acetolactate Synthase (B/2)	17127
	95	Chenopodium album	Common Lambsquarters	Canada	Quebec	2008	7	Inhibition of Acetolactate Synthase (B/2)	17131
	96	Amaranthus retroflexus	Redroot Pigweed	Canada	Quebec	2009	7	Inhibition of Acetolactate Synthase (B/2)	17125
	97	Amaranthus powellii	Powell Amaranth	Canada	Quebec	2012	7	PSII inhibitors - Serine 264 Binders (C1 C2/7)	17123
	98	Amaranthus powellii	Powell Amaranth	Canada	Quebec	2012	7	Inhibition of Acetolactate Synthase (B/2)	17124
	99	Avena fatua	Wild Oat	Canada	Quebec	2012	7	Inhibition of Acetyl CoA Carboxylase (A/1)	17129
	100	Brassica rapa (=B. campestris)	Birdsrape Mustard	Canada	Quebec	2017	7	Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	17130
	State: Saskatchewan
	101	Kochia scoparia	Kochia	Canada	Saskatchewan	1988	7	Inhibition of Acetolactate Synthase (B/2)	5069
	102	Salsola tragus	Russian-thistle	Canada	Saskatchewan	1989	7	Inhibition of Acetolactate Synthase (B/2)	5067
	103	Avena fatua	Wild Oat	Canada	Saskatchewan	1990	7	Inhibition of Acetyl CoA Carboxylase (A/1)	5041
	104	Setaria viridis	Green Foxtail	Canada	Saskatchewan	1991	7	Inhibition of Microtubule Assembly 2 (K1/3)	5040
	105	Setaria viridis	Green Foxtail	Canada	Saskatchewan	1996	7	Inhibition of Acetyl CoA Carboxylase (A/1)	5038
	106	Setaria viridis	Green Foxtail	Canada	Saskatchewan	1996	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Microtubule Assembly 2 (K1/3)	5070
	107	Avena fatua	Wild Oat	Canada	Saskatchewan	1996	7	Inhibition of Acetolactate Synthase (B/2)	5072
	108	Avena fatua	Wild Oat	Canada	Saskatchewan	1996	7	Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/8)	5073
	109	Avena fatua	Wild Oat	Canada	Saskatchewan	1996	7	Multiple Resistance: 3 Sites of Action Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetolactate Synthase (B/2) Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/8)	5074
	110	Sinapis arvensis	Wild Mustard	Canada	Saskatchewan	2002	7	Inhibition of Acetolactate Synthase (B/2)	5243
	111	Lolium persicum	Persian Darnel	Canada	Saskatchewan	2004	7	Inhibition of Acetyl CoA Carboxylase (A/1)	5244
	112	Stellaria media	Common Chickweed	Canada	Saskatchewan	2005	7	Inhibition of Acetolactate Synthase (B/2)	5322
	113	Galium spurium	False Cleavers	Canada	Saskatchewan	2006	7	Inhibition of Acetolactate Synthase (B/2)	5321
	114	Capsella bursa-pastoris	Shepherd's-purse	Canada	Saskatchewan	2008	7	Inhibition of Acetolactate Synthase (B/2)	5381
	115	Thlaspi arvense	Field Pennycress	Canada	Saskatchewan	2009	7	Inhibition of Acetolactate Synthase (B/2)	5626
	116	Chenopodium album	Common Lambsquarters	Canada	Saskatchewan	2009	7	Inhibition of Acetolactate Synthase (B/2)	5627
	117	Amaranthus retroflexus	Redroot Pigweed	Canada	Saskatchewan	2010	7	Inhibition of Acetolactate Synthase (B/2)	5628
	118	Kochia scoparia	Kochia	Canada	Saskatchewan	2012	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)	7834
	119	Kochia scoparia	Kochia	Canada	Saskatchewan	2015	7	Multiple Resistance: 2 Sites of Action Inhibition of Acetolactate Synthase (B/2) Auxin Mimics (O/4)	11032

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.  Friday, January 21, 2022 .  Available  www.weedscience.org
Copyright © 1993- 2022 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.