International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
select
Herbicide Resistant Weeds in Ontario, Canada.
#YearSpeciesSite of ActionActivesContacts
1 307Wild Carrot1957Daucus carota
Wild Carrot
Canada
(Ontario)
OntarioOntario Synthetic Auxins (O/4) Synthetic Auxins (O/4) 2,4-D Clarence Swanton, Chris Hall
2 58Common Lambsquarters1973Chenopodium album
Common Lambsquarters
Canada
(Ontario)
OntarioOntario Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Clarence Swanton
3 59Common Ragweed1976Ambrosia artemisiifolia
Common Ragweed
Canada
(Ontario)
OntarioOntario Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Clarence Swanton
4 60Lateflowering Goosefoot1976Chenopodium album var. striatum (=C. strictum var. glaucophyllum)
Lateflowering Goosefoot
Canada
(Ontario)
OntarioOntario Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Clarence Swanton
5 1158Powell Amaranth1977Amaranthus powellii
Powell Amaranth
Canada
(Ontario)
Ontario  Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine, metribuzin Francois Tardif, Clarence Swanton
6 5066Common Groundsel1977Senecio vulgaris
Common Groundsel
Canada
(Ontario)
OntarioOntario Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Hugh Beckie
7 61Redroot Pigweed1980Amaranthus retroflexus
Redroot Pigweed
Canada
(Ontario)
OntarioOntario Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Clarence Swanton
8 62Barnyardgrass1981Echinochloa crus-galli var. crus-galli
Barnyardgrass
Canada
(Ontario)
OntarioOntario Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Clarence Swanton
9 63Witchgrass1981Panicum capillare
Witchgrass
Canada
(Ontario)
OntarioOntario Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Clarence Swanton
10 64Yellow Foxtail1981Setaria pumila (=S. glauca)
Yellow Foxtail
Canada
(Ontario)
OntarioOntario Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Clarence Swanton
11 5065Wild Mustard1983Sinapis arvensis
Wild Mustard
Canada
(Ontario)
OntarioOntario Photosystem II inhibitors (C1/5) Photosystem II inhibitors (C1/5) atrazine Hugh Beckie
12 48Horseweed1993Conyza canadensis
Horseweed
Canada
(Ontario)
OntarioOntario PSI Electron Diverter (D/22) PSI Electron Diverter (D/22) paraquat Susan Weaver
13 49Virginia Pepperweed1993Lepidium virginicum
Virginia Pepperweed
Canada
(Ontario)
OntarioOntario PSI Electron Diverter (D/22) PSI Electron Diverter (D/22) paraquat Susan Weaver
14 5049Powell Amaranth1998Amaranthus powellii
Powell Amaranth
Canada
(Ontario)
OntarioOntario ALS inhibitors (B/2), Photosystem II inhibitors (C1/5) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
atrazine, imazethapyr, metribuzin Francois Tardif
15 1159Powell Amaranth1998Amaranthus powellii
Powell Amaranth
Canada
(Ontario)
OntarioOntario ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, thifensulfuron-methyl Francois Tardif
16 1161Redroot Pigweed1998Amaranthus retroflexus
Redroot Pigweed
Canada
(Ontario)
OntarioOntario ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr, thifensulfuron-methyl Francois Tardif
17 5048Powell Amaranth1999Amaranthus powellii
Powell Amaranth
Canada
(Ontario)
Ontario  Photosystem II inhibitors (C1/5), PSII inhibitor (Ureas and amides) (C2/7) Multiple Resistance: 2 Sites of Action
Photosystem II inhibitors (C1/5)
PSII inhibitor (Ureas and amides) (C2/7)
atrazine, linuron, monolinuron, prometryn Francois Tardif
18 5471Common Ragweed2000Ambrosia artemisiifolia
Common Ragweed
Canada
(Ontario)
Ontario  ALS inhibitors (B/2) ALS inhibitors (B/2) chlorimuron-ethyl, cloransulam-methyl, imazethapyr Francois Tardif
19 5211Eastern Black Nightshade2000Solanum ptycanthum
Eastern Black Nightshade
Canada
(Ontario)
Ontario  ALS inhibitors (B/2) ALS inhibitors (B/2) flumetsulam, imazamox, imazethapyr, nicosulfuron, primisulfuron-methyl, prosulfuron, rimsulfuron Francois Tardif, Jamshid Ashigh
20 5123Common Lambsquarters2001Chenopodium album
Common Lambsquarters
Canada
(Ontario)
OntarioOntario ALS inhibitors (B/2) ALS inhibitors (B/2) thifensulfuron-methyl Francois Tardif
21 5124Green Foxtail2001Setaria viridis
Green Foxtail
Canada
(Ontario)
Ontario  ALS inhibitors (B/2) ALS inhibitors (B/2) flucarbazone-sodium, imazethapyr, nicosulfuron, pyrithiobac-sodium Francois Tardif
22 5125Redroot Pigweed2001Amaranthus retroflexus
Redroot Pigweed
Canada
(Ontario)
Ontario  PSII inhibitor (Ureas and amides) (C2/7) PSII inhibitor (Ureas and amides) (C2/7) linuron Francois Tardif
23 5212Tall Waterhemp2002Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  ALS inhibitors (B/2), Photosystem II inhibitors (C1/5) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
atrazine, imazethapyr Francois Tardif
24 5213Tall Waterhemp2002Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr Francois Tardif
25 5210Giant Foxtail2003Setaria faberi
Giant Foxtail
Canada
(Ontario)
Ontario  ALS inhibitors (B/2) ALS inhibitors (B/2) imazethapyr Francois Tardif
26 5472Smooth Pigweed2004Amaranthus hybridus (syn: quitensis)
Smooth Pigweed
Canada
(Ontario)
Ontario  PSII inhibitors (Nitriles) (C3/6) PSII inhibitors (Nitriles) (C3/6) bentazon, bromoxynil Francois Tardif
27 5473Redroot Pigweed2005Amaranthus retroflexus
Redroot Pigweed
Canada
(Ontario)
Ontario  PSII inhibitors (Nitriles) (C3/6) PSII inhibitors (Nitriles) (C3/6) bentazon, bromoxynil Francois Tardif
28 5483Giant Ragweed2008Ambrosia trifida
Giant Ragweed
Canada
(Ontario)
Ontario  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Francois Tardif
29 5493Eastern Black Nightshade2009Solanum ptycanthum
Eastern Black Nightshade
Canada
(Ontario)
Ontario  PSI Electron Diverter (D/22) PSI Electron Diverter (D/22) paraquat Francois Tardif, Kristen Obeid
30 5665Horseweed2010Conyza canadensis
Horseweed
Canada
(Ontario)
Ontario  EPSP synthase inhibitors (G/9) EPSP synthase inhibitors (G/9) glyphosate Francois Tardif
31 5666Horseweed2011Conyza canadensis
Horseweed
Canada
(Ontario)
Ontario  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
cloransulam-methyl, glyphosate Francois Tardif
32 5678Large Crabgrass2011Digitaria sanguinalis
Large Crabgrass
Canada
(Ontario)
Ontario  ACCase inhibitors (A/1) ACCase inhibitors (A/1) clethodim, fenoxaprop-P-ethyl, fluazifop-P-butyl, quizalofop-P-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  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
cloransulam-methyl, glyphosate Francois Tardif
34 5713Common Ragweed2012Ambrosia artemisiifolia
Common Ragweed
Canada
(Ontario)
Ontario  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
chlorimuron-ethyl, cloransulam-methyl, glyphosate, imazamethabenz-methyl Francois Tardif
35 9940Tall Waterhemp2014Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
glyphosate, imazethapyr Peter Sikkema
36 17140Tall Waterhemp2017Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9), Photosystem II inhibitors (C1/5), PPO inhibitors (E/14) Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
Photosystem II inhibitors (C1/5)
PPO inhibitors (E/14)
atrazine, glyphosate, imazethapyr, lactofen Peter Sikkema
37 17141Tall Waterhemp2017Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  ALS inhibitors (B/2), EPSP synthase inhibitors (G/9), Photosystem II inhibitors (C1/5) Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
Photosystem II inhibitors (C1/5)
atrazine, glyphosate, imazethapyr Peter Sikkema
38 17142Tall Waterhemp2017Amaranthus tuberculatus (=A. rudis)
Tall Waterhemp
Canada
(Ontario)
Ontario  EPSP synthase inhibitors (G/9), Photosystem II inhibitors (C1/5) Multiple Resistance: 2 Sites of Action
EPSP synthase inhibitors (G/9)
Photosystem II inhibitors (C1/5)
atrazine, glyphosate, metribuzin Peter Sikkema
Contributing Weed Scientists
1
Page size:
select
Page: of 1
Items 1 to 9 of 9
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, October 16, 2019 .  Available  www.weedscience.org
Copyright © 1993- 2019 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.