International Survey of Herbicide-Resistant Weeds

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Status of Herbicide Resistance in Saskatchewan - 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 Saskatchewan, Canada.
#YearSpeciesSite of ActionActivesContacts
1 5069Kochia1988Kochia scoparia
Kochia
Canada
(Saskatchewan)
SaskatchewanSaskatchewan ALS inhibitors (B/2) ALS inhibitors (B/2) thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
2 5067Russian-thistle1989Salsola tragus
Russian-thistle
Canada
(Saskatchewan)
SaskatchewanSaskatchewan ALS inhibitors (B/2) ALS inhibitors (B/2) chlorsulfuron Hugh Beckie
3 5041Wild Oat1990Avena fatua
Wild Oat
Canada
(Saskatchewan)
Saskatchewan  ACCase inhibitors (A/1) ACCase inhibitors (A/1) fenoxaprop-P-ethyl, sethoxydim Hugh Beckie
4 5040Green Foxtail1991Setaria viridis
Green Foxtail
Canada
(Saskatchewan)
Saskatchewan  Microtubule inhibitors (K1/3) Microtubule inhibitors (K1/3) ethalfluralin, trifluralin Hugh Beckie
5 5038Green Foxtail1996Setaria viridis
Green Foxtail
Canada
(Saskatchewan)
Saskatchewan  ACCase inhibitors (A/1) ACCase inhibitors (A/1) fenoxaprop-P-ethyl, sethoxydim Hugh Beckie
6 5070Green Foxtail1996Setaria viridis
Green Foxtail
Canada
(Saskatchewan)
Saskatchewan  ACCase inhibitors (A/1), Microtubule inhibitors (K1/3) Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
Microtubule inhibitors (K1/3)
fenoxaprop-P-ethyl, trifluralin Hugh Beckie
7 5072Wild Oat1996Avena fatua
Wild Oat
Canada
(Saskatchewan)
Saskatchewan  ALS inhibitors (B/2) ALS inhibitors (B/2) imazamethabenz-methyl Hugh Beckie
8 5073Wild Oat1996Avena fatua
Wild Oat
Canada
(Saskatchewan)
Saskatchewan  Lipid Inhibitors (N/8) Lipid Inhibitors (N/8) triallate Hugh Beckie
9 5074Wild Oat1996Avena fatua
Wild Oat
Canada
(Saskatchewan)
Saskatchewan  ACCase inhibitors (A/1), ALS inhibitors (B/2), Lipid Inhibitors (N/8) Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
Lipid Inhibitors (N/8)
fenoxaprop-P-ethyl, imazamethabenz-methyl, triallate Hugh Beckie
10 5243Wild Mustard2002Sinapis arvensis
Wild Mustard
Canada
(Saskatchewan)
SaskatchewanSaskatchewan ALS inhibitors (B/2) ALS inhibitors (B/2) ethametsulfuron-methyl, imazethapyr, thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
11 5244Persian Darnel2004Lolium persicum
Persian Darnel
Canada
(Saskatchewan)
SaskatchewanSaskatchewan ACCase inhibitors (A/1) ACCase inhibitors (A/1) tralkoxydim Hugh Beckie
12 5322Common Chickweed2005Stellaria media
Common Chickweed
Canada
(Saskatchewan)
Saskatchewan  ALS inhibitors (B/2) ALS inhibitors (B/2) thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
13 5321False Cleavers2006Galium spurium
False Cleavers
Canada
(Saskatchewan)
Saskatchewan  ALS inhibitors (B/2) ALS inhibitors (B/2) thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
14 5381Shepherd's-purse2008Capsella bursa-pastoris
Shepherd's-purse
Canada
(Saskatchewan)
Saskatchewan  ALS inhibitors (B/2) ALS inhibitors (B/2) imazamox, imazethapyr, thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
15 5626Field Pennycress2009Thlaspi arvense
Field Pennycress
Canada
(Saskatchewan)
Saskatchewan  ALS inhibitors (B/2) ALS inhibitors (B/2) thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
16 5627Common Lambsquarters2009Chenopodium album
Common Lambsquarters
Canada
(Saskatchewan)
Saskatchewan  ALS inhibitors (B/2) ALS inhibitors (B/2) thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
17 5628Redroot Pigweed2010Amaranthus retroflexus
Redroot Pigweed
Canada
(Saskatchewan)
Saskatchewan  ALS inhibitors (B/2) ALS inhibitors (B/2) thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
18 7834Kochia2012Kochia scoparia
Kochia
Canada
(Saskatchewan)
Saskatchewan  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, thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
19 11032Kochia2015Kochia scoparia
Kochia
Canada
(Saskatchewan)
Saskatchewan  ALS inhibitors (B/2), Synthetic Auxins (O/4) Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
dicamba, fluroxypyr, thifensulfuron-methyl, tribenuron-methyl Hugh Beckie
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, December 7, 2019 .  Available  www.weedscience.org
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