INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT COMMON CHICKWEED
(Stellaria media)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Latvia, Riga
INTRODUCTION COMMON CHICKWEED
Common Chickweed (Stellaria media) is a dicot weed in the Caryophyllaceae family.  In Latvia this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2016 and infests Winter wheat.   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 amidosulfuron 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 Mar 08, 2017 )

Common NameCommon Chickweed
SpeciesStellaria media
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesamidosulfuron
LocationLatvia, Riga
Year2016
Situation(s)Winter wheat
Contributors - (Alphabetically)Jevgenija Necajeva 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Jevgenija Necajeva

Stellaria media L. (common chickweed) with ALS inhibitor Resistance in Latvia.

Common chickweed is in the list of the most widespread weed species in Latvia. There were suspicions of herbicide resistance in 2013, resistance to ALS inhibitors was confirmed in the same field in 2016. ALS inhibitors (B group) were applied in 8 years during the time period from 2009 to 2016. In 5 of 8 years amidosulfuron was applied. Molecular analysis of the TSR mutations showed that there was a heterozygous mutation in Pro-197 site in 3 out of 8 tested individuals in the sample collected in 2013 and a homozygous mutation in Pro-197 one out of 8 tested individuals in the sample collected in 2016 (winter wheat). Such mutations indicate resistance to sulfonylurea herbicides.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Common Chickweed biotype with this Common Chickweed 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 Chickweed 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

Studies on the mechanism of resistance of Group 2 (Legacy B) resistant Common Chickweed from Latvia indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Chickweed from Latvia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JEVGENIJA NECAJEVA
Research Scientist
University of Latvia
Department of Plant Physiology
1 Jelgavas Street
Riga, Riga
Latvia
Email Jevgenija Necajeva

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Latvia have been instrumental in providing you this information. Particular thanks is given to Jevgenija Necajeva for providing detailed information.
Herbicide Resistant Common Chickweed Globally
(Stellaria media)
Herbicide Resistant Common Chickweed Globally
(Stellaria media)
Drag a column header and drop it here to group by that column
Herbicide Resistant Common Chickweed Globally
(Stellaria media)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BelgiumBelgium 2013 Wheat metsulfuron-methyl 3 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed10959
2 Canada (Alberta) CanadaAlberta1988 Cereals, and Wheat chlorsulfuron, ethametsulfuron-methyl, imazamethabenz-methyl, metsulfuron-methyl, sulfometuron-methyl, and thifensulfuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed481
3 Canada (Saskatchewan) CanadaSaskatchewan2005 Spring Barley, and Wheat thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5322
4 Canada (Manitoba) CanadaManitoba2008 Peas thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5630
5 ChinaChina 2010 Winter wheat fluroxypyr, and MCPA 9 Auxin Mimics ( HRAC Group 4 (Legacy O)
168Stellaria mediaCommon Chickweed5658
6 DenmarkDenmark 1991 Spring Barley, and Wheat chlorsulfuron, florasulam, iodosulfuron-methyl-Na, and tribenuron-methyl 13 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed86
7 FinlandFinland 2013 Spring Barley tribenuron-methyl 139 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed9946
8 FranceFrance 2012 Wheat florasulam, iodosulfuron-methyl-Na, mesosulfuron-methyl, metsulfuron-methyl, and thifensulfuron-methyl 17 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5688
9 GermanyGermany 1978 Corn (maize) atrazine 18 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
168Stellaria mediaCommon Chickweed435
10 GermanyGermany 2011 Rapeseed, Spring Barley, and Wheat amidosulfuron, florasulam, imazamox, iodosulfuron-methyl-Na, mesosulfuron-methyl, nicosulfuron, pyroxsulam, thifensulfuron-methyl, tribenuron-methyl, triflusulfuron-methyl, and tritosulfuron 18 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed6744
11 IrelandIreland 1996 Cereals metsulfuron-methyl 81 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5089
12 LatviaLatvia 2016 Winter wheat amidosulfuron 174 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed15068
13 New ZealandNew Zealand 1995 Cereals chlorsulfuron 30 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed161
14 NorwayNorway 2002 Cereals iodosulfuron-methyl-Na, metsulfuron-methyl, and tribenuron-methyl 31 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5165
15 South AfricaSouth Africa 2002 Cereals chlorsulfuron, metsulfuron-methyl, thifensulfuron-methyl, and triasulfuron 37 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5193
16 SwedenSweden 1995 Spring Barley, Spring wheat, and Winter wheat chlorsulfuron, florasulam, and tribenuron-methyl 40 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed510
17 United KingdomUnited Kingdom 1985 Cereals, and Wheat mecoprop 44 Auxin Mimics ( HRAC Group 4 (Legacy O)
168Stellaria mediaCommon Chickweed358
18 United KingdomUnited Kingdom 2000 Cereals florasulam, and metsulfuron-methyl 44 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5088
19 United States (Virginia) United StatesVirginia2008 Wheat thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5373
20 United States (Maryland) United StatesMaryland2009 Wheat chlorsulfuron, mesosulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5374
21 United States (Pennsylvania) United StatesPennsylvania2010 Alfalfa, Spring Barley, and Wheat pyroxsulam, thifensulfuron-methyl, and tribenuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed7898
22 United States (Delaware) United StatesDelaware2012 Wheat thifensulfuron-methyl, and tribenuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed5708
23 United States (Kentucky) United StatesKentucky2013 Wheat chlorsulfuron, flucarbazone-Na, thifensulfuron-methyl, and tribenuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed7883
24 United States (California) United StatesCalifornia2022 Triticale, and Wheat mesosulfuron-methyl, pyroxsulam, and tribenuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
168Stellaria mediaCommon Chickweed24253
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