International Survey of Herbicide-Resistant Weeds

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HRAC GROUP 2 (LEGACY B) RESISTANT COMMON LAMBSQUARTERS
(Chenopodium album)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Canada, Ontario
INTRODUCTION COMMON LAMBSQUARTERS
Common Lambsquarters (Chenopodium album) is a dicot weed in the Chenopodiaceae family.  In Ontario this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2001 and infests Soybean.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to thifensulfuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) herbicides.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Dec 16, 2002 )

Common NameCommon Lambsquarters
SpeciesChenopodium album
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesthifensulfuron-methyl
LocationCanada, Ontario
Year2001
Situation(s)Soybean
Contributors - (Alphabetically)Francois Tardif 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Francois Tardif
Many samples of Chenopodium album ahve been sent to the University of Guelph for resistance confirmation in 2001 and 2002. In most cases it was found that there was no resistance. In this particular case, the resistant biotype survived thifensulfuron-methyl at rates that completely controlled the susceptible.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Common Lambsquarters biotype with this Common Lambsquarters biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.
 
Genetics

Genetic studies on HRAC Group 2 resistant Common Lambsquarters have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
 
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
 
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group 2 (Legacy B) resistant Common Lambsquarters from Ontario please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

FRANCOIS TARDIF
Associate Professor
University Of Guelph
Department Of Plant Agriculture
2055 Radatz Ave
Guelph, N1G 2W1, Ontario
Canada
Email Francois Tardif
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Ontario have been instrumental in providing you this information. Particular thanks is given to Francois Tardif for providing detailed information.
Herbicide Resistant Common Lambsquarters Globally
(Chenopodium album)
Herbicide Resistant Common Lambsquarters Globally
(Chenopodium album)
Drag a column header and drop it here to group by that column
Herbicide Resistant Common Lambsquarters Globally
(Chenopodium album)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BelgiumBelgium 1980 Corn (maize), Potatoes, Roadsides, and Sugar beets atrazine, metamitron, and metribuzin 3 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters30
2 BulgariaBulgaria 1989 Cropland metribuzin 6 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters47
3 Canada (Ontario) CanadaOntario1973 Corn (maize), and Cropland atrazine 7 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters58
4 Canada (Quebec) CanadaQuebec1980 Corn (maize) atrazine 7 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters17132
5 Canada (Ontario) CanadaOntario2001 Soybean thifensulfuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
47Chenopodium albumCommon Lambsquarters5123
6 Canada (Quebec) CanadaQuebec2008 Soybean thifensulfuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
47Chenopodium albumCommon Lambsquarters17131
7 Canada (Saskatchewan) CanadaSaskatchewan2009 Spring Barley, and Wheat thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
47Chenopodium albumCommon Lambsquarters5627
8 Canada (Prince Edward Island) CanadaPrince Edward Island2018 Potatoes metribuzin 7 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters28273
9 Canada (New Brunswick) CanadaNew Brunswick2018 Potatoes metribuzin 7 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters28276
10 Czech RepublicCzech Republic 1986 Corn (maize), and Sugar beets atrazine, cyanazine, lenacil, metamitron, prometon, simazine, terbuthylazine, and terbutryne 12 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters81
11 FinlandFinland 2015 Spring wheat tribenuron-methyl 139 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
47Chenopodium albumCommon Lambsquarters11013
12 FranceFrance 1978 Corn (maize) atrazine, metamitron, and metribuzin 17 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters458
13 GermanyGermany 1980 Corn (maize), and Potatoes simazine 18 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters368
14 GreeceGreece 2000 Potatoes metribuzin 19 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters5059
15 ItalyItaly 1982 Corn (maize) atrazine 24 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters116
16 NetherlandsNetherlands 1980 Corn (maize) atrazine 43 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters217
17 New ZealandNew Zealand 1979 Corn (maize) atrazine 30 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters156
18 New ZealandNew Zealand 2005 Corn (maize) aminopyralid, clopyralid, and dicamba 30 Auxin Mimics ( HRAC Group 4 (Legacy O)
47Chenopodium albumCommon Lambsquarters5389
19 NorwayNorway 1994 Cropland metribuzin 31 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters523
20 NorwayNorway 1994 Cropland linuron 31 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters542
21 PolandPoland 1991 Corn (maize), and Sugar beets atrazine, and metamitron 33 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters163
22 PortugalPortugal 2003 Corn (maize) atrazine 34 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters5227
23 SloveniaSlovenia 1996 Corn (maize) atrazine 36 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters371
24 SpainSpain 1987 Corn (maize) atrazine 38 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters186
25 SwedenSweden 2005 Potatoes, and Sugar beets metamitron, and metribuzin 40 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters9928
26 SwitzerlandSwitzerland 1977 Corn (maize) atrazine 41 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters200
27 UkraineUkraine 2022 Corn (maize), Soybean, Sunflower, and Wheat florasulam, flumetsulam, imazamox, iodosulfuron-methyl-Na, thiencarbazone-methyl, thifensulfuron-methyl, and tribenuron-methyl 230 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
47Chenopodium albumCommon Lambsquarters24250
28 United KingdomUnited Kingdom 1989 Cropland simazine 44 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters361
29 United States (Michigan) United StatesMichigan1975 Corn (maize), Nurseries, and Soybean atrazine, metribuzin, and simazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters5084
30 United States (New York) United StatesNew York1977 Corn (maize), and Soybean atrazine, cyanazine, and simazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters1053
31 United States (Virginia) United StatesVirginia1979 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters274
32 United States (Wisconsin) United StatesWisconsin1979 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters419
33 United States (North Carolina) United StatesNorth Carolina1980 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters261
34 United States (Pennsylvania) United StatesPennsylvania1980 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters263
35 United States (Indiana) United StatesIndiana1980 Corn (maize), and Cropland atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters409
36 United States (Ohio) United StatesOhio1981 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters1089
37 United States (Minnesota) United StatesMinnesota1982 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters246
38 United States (Maryland) United StatesMaryland1982 Corn (maize), and Cropland atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters424
39 United States (Massachusetts) United StatesMassachusetts1983 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters1095
40 United States (Illinois) United StatesIllinois1985 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters237
41 United States (Maine) United StatesMaine1985 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters1091
42 United States (New Hampshire) United StatesNew Hampshire1986 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters1077
43 United States (Delaware) United StatesDelaware1988 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters491
44 United States (Iowa) United StatesIowa1989 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters242
45 United States (Vermont) United StatesVermont1991 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters1102
46 United States (Connecticut) United StatesConnecticut1992 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters1072
47 United States (Rhode Island) United StatesRhode Island1995 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters495
48 United States (Tennessee) United StatesTennessee1998 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters1107
49 United States (West Virginia) United StatesWest Virginia2000 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters7772
50 United States (Michigan) United StatesMichigan2001 Soybean imazamox, and thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
47Chenopodium albumCommon Lambsquarters5133
51 United States (Ohio) United StatesOhio2001 Soybean thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
47Chenopodium albumCommon Lambsquarters5232
52 United States (Washington) United StatesWashington2010 Mint, and Potatoes metribuzin, and terbacil 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
47Chenopodium albumCommon Lambsquarters5668
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