International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Herbicide Resistant Weeds in Ontario, Canada.
#YearSpeciesSite of ActionActivesContacts
1 307Wild Carrot1957Daucus carota
Wild Carrot
Canada
(Ontario)
OntarioOntario Auxin Mimics (O/4) Auxin Mimics (O/4) 2,4-D Clarence Swanton, Chris Hall
2 58Common Lambsquarters1973Chenopodium album
Common Lambsquarters
Canada
(Ontario)
OntarioOntario PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Clarence Swanton
3 59Common Ragweed1976Ambrosia artemisiifolia
Common Ragweed
Canada
(Ontario)
OntarioOntario PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Clarence Swanton
4 60Lateflowering Goosefoot1976Chenopodium album var. striatum (=C. strictum var. glaucophyllum)
Lateflowering Goosefoot
Canada
(Ontario)
OntarioOntario PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Clarence Swanton
5 1158Powell Amaranth1977Amaranthus powellii
Powell Amaranth
Canada
(Ontario)
Ontario  PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine, metribuzin Francois Tardif, Clarence Swanton
6 5066Common Groundsel1977Senecio vulgaris
Common Groundsel
Canada
(Ontario)
OntarioOntario PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Hugh Beckie
7 61Redroot Pigweed1980Amaranthus retroflexus
Redroot Pigweed
Canada
(Ontario)
OntarioOntario PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Clarence Swanton
8 62Barnyardgrass1981Echinochloa crus-galli var. crus-galli
Barnyardgrass
Canada
(Ontario)
OntarioOntario PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Clarence Swanton
9 63Witchgrass1981Panicum capillare
Witchgrass
Canada
(Ontario)
OntarioOntario PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Clarence Swanton
10 64Yellow Foxtail1981Setaria pumila (=S. glauca)
Yellow Foxtail
Canada
(Ontario)
OntarioOntario PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Clarence Swanton
11 5065Wild Mustard1983Sinapis arvensis
Wild Mustard
Canada
(Ontario)
OntarioOntario PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Hugh Beckie
12 48Horseweed1993Conyza canadensis
Horseweed
Canada
(Ontario)
OntarioOntario PS I Electron Diversion (D/22) PS I Electron Diversion (D/22) paraquat Susan Weaver
13 49Virginia Pepperweed1993Lepidium virginicum
Virginia Pepperweed
Canada
(Ontario)
OntarioOntario PS I Electron Diversion (D/22) PS I Electron Diversion (D/22) paraquat Susan Weaver
14 5049Powell Amaranth1998Amaranthus powellii
Powell Amaranth
Canada
(Ontario)
OntarioOntario Inhibition of Acetolactate Synthase (B/2), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
PSII inhibitors - Serine 264 Binders (C1 C2/5)
atrazine, imazethapyr, metribuzin Francois Tardif
15 1159Powell Amaranth1998Amaranthus powellii
Powell Amaranth
Canada
(Ontario)
OntarioOntario Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr, thifensulfuron-methyl Francois Tardif
16 1161Redroot Pigweed1998Amaranthus retroflexus
Redroot Pigweed
Canada
(Ontario)
OntarioOntario Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr, thifensulfuron-methyl Francois Tardif
17 5048Powell Amaranth1999Amaranthus powellii
Powell Amaranth
Canada
(Ontario)
Ontario  PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine, linuron, monolinuron, prometryne Francois Tardif
18 5471Common Ragweed2000Ambrosia artemisiifolia
Common Ragweed
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorimuron-ethyl, cloransulam-methyl, imazethapyr Francois Tardif
19 5211Eastern Black Nightshade2000Solanum ptycanthum
Eastern Black Nightshade
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) flumetsulam, imazamox, imazethapyr, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron Francois Tardif, Jamshid Ashigh
20 5123Common Lambsquarters2001Chenopodium album
Common Lambsquarters
Canada
(Ontario)
OntarioOntario Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) thifensulfuron-methyl Francois Tardif
21 5124Green Foxtail2001Setaria viridis
Green Foxtail
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) flucarbazone-Na, imazethapyr, nicosulfuron, pyrithiobac-sodium Francois Tardif
22 5125Redroot Pigweed2001Amaranthus retroflexus
Redroot Pigweed
Canada
(Ontario)
Ontario  PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) linuron Francois Tardif
23 5212Tall Waterhemp2002Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
PSII inhibitors - Serine 264 Binders (C1 C2/5)
atrazine, imazethapyr Francois Tardif
24 5213Tall Waterhemp2002Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr Francois Tardif
25 5210Giant Foxtail2003Setaria faberi
Giant Foxtail
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazethapyr Francois Tardif
26 5472Smooth Pigweed2004Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
Canada
(Ontario)
Ontario  PSII inhibitors - Histidine 215 Binders (C3/6) PSII inhibitors - Histidine 215 Binders (C3/6) bentazon, bromoxynil Francois Tardif
27 5473Redroot Pigweed2005Amaranthus retroflexus
Redroot Pigweed
Canada
(Ontario)
Ontario  PSII inhibitors - Histidine 215 Binders (C3/6) PSII inhibitors - Histidine 215 Binders (C3/6) bentazon, bromoxynil Francois Tardif
28 5483Giant Ragweed2008Ambrosia trifida
Giant Ragweed
Canada
(Ontario)
Ontario  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Francois Tardif
29 5493Eastern Black Nightshade2009Solanum ptycanthum
Eastern Black Nightshade
Canada
(Ontario)
Ontario  PS I Electron Diversion (D/22) PS I Electron Diversion (D/22) paraquat Francois Tardif, Kristen Obeid
30 5665Horseweed2010Conyza canadensis
Horseweed
Canada
(Ontario)
Ontario  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Francois Tardif
31 5666Horseweed2011Conyza canadensis
Horseweed
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
cloransulam-methyl, glyphosate Francois Tardif
32 5678Large Crabgrass2011Digitaria sanguinalis
Large Crabgrass
Canada
(Ontario)
Ontario  Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) clethodim, fenoxaprop-ethyl, fluazifop-butyl, quizalofop-ethyl, sethoxydim Francois Tardif, Kristen Obeid, Martin Laforest, Brahim Soufiane, Robert Nurse, Eric Page, Marie-Josée Simard
33 7833Giant Ragweed2011Ambrosia trifida
Giant Ragweed
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
cloransulam-methyl, glyphosate Francois Tardif
34 5713Common Ragweed2012Ambrosia artemisiifolia
Common Ragweed
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
chlorimuron-ethyl, cloransulam-methyl, glyphosate, imazamethabenz-methyl Francois Tardif
35 9940Tall Waterhemp2014Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
glyphosate, imazethapyr Peter Sikkema
36 17140Tall Waterhemp2017Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), Inhibition of Protoporphyrinogen Oxidase (E/14), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 4 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
Inhibition of Protoporphyrinogen Oxidase (E/14)
PSII inhibitors - Serine 264 Binders (C1 C2/5)
atrazine, glyphosate, imazethapyr, lactofen Peter Sikkema
37 17141Tall Waterhemp2017Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
PSII inhibitors - Serine 264 Binders (C1 C2/5)
atrazine, glyphosate, imazethapyr Peter Sikkema
38 17142Tall Waterhemp2017Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 2 Sites of Action
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
PSII inhibitors - Serine 264 Binders (C1 C2/5)
atrazine, glyphosate, metribuzin Peter Sikkema
39 24243Powell Amaranth2019Amaranthus powellii
Powell Amaranth
Canada
(Ontario)
Ontario  Auxin Mimics (O/4), Inhibition of Acetolactate Synthase (B/2) Multiple Resistance: 2 Sites of Action
Auxin Mimics (O/4)
Inhibition of Acetolactate Synthase (B/2)
aminocyclopyrachlor, dichlorprop, imazethapyr, MCPA, mecoprop Francois Tardif, Peter Sikkema, Martin Laforest, Darren Robinson, Nader Soltani, Isabelle Aicklen
40 22236Italian Ryegrass2021Lolium perenne ssp. multiflorum
Italian Ryegrass
Canada
(Ontario)
Ontario  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Kristen Obeid, Peter Sikkema, Melanie Filotas
41 24242Tall Waterhemp2021Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  Inhibition of Acetolactate Synthase (B/2), Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27), Inhibition of Protoporphyrinogen Oxidase (E/14), PSII inhibitors - Serine 264 Binders (C1 C2/5) Multiple Resistance: 5 Sites of Action
Inhibition of Acetolactate Synthase (B/2)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
Inhibition of Hydroxyphenyl Pyruvate Dioxygenase (F2/27)
Inhibition of Protoporphyrinogen Oxidase (E/14)
PSII inhibitors - Serine 264 Binders (C1 C2/5)
atrazine, glyphosate, imazethapyr, lactofen, mesotrione, metribuzin Peter Sikkema, Nader Soltani
Contributing Weed Scientists
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, February 23, 2024 .  Available  www.weedscience.org
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