International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT COMMON CHICKWEED
(Stellaria media)


ALS inhibitors (B/2)

Denmark
INTRODUCTION COMMON CHICKWEED
Common Chickweed (Stellaria media) is a dicot weed in the Caryophyllaceae family.  In Denmark this weed first evolved resistance to Group B/2 herbicides in 1991 and infests Spring Barley, and Wheat.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to chlorsulfuron, florasulam, iodosulfuron-methyl-sodium, and tribenuron-methyl and they may be cross-resistant to other Group B/2 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 May 07, 2017 )

Common NameCommon Chickweed
SpeciesStellaria media
GroupALS inhibitors (B/2)
Herbicideschlorsulfuron, florasulam, iodosulfuron-methyl-sodium, and tribenuron-methyl
LocationDenmark
Year1991
Situation(s)Spring Barley, and Wheat
Contributors - (Alphabetically)Per Kudsk, and Solvejg Mathiassen 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Per Kudsk
Only in one location.

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AREAS FOUND

Solvejg Mathiassen
From 1991 to 2008 the number of sites has increased to 17. In 2011 the number of identified cases has increased to 26

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GENERAL

Solvejg Mathiassen

April 2017 Update

For Stellaria media we now have 36 verified cases of resistance to SU herbicides. Six of these populations were also resistant to florasulam. Most of these cases are seed samples sent by farmers or consultants on suspicion of resistance. They have been tested in pot experiments including a susceptible and resistant reference population. In these tests tribenuron-methyl and florasulam have been applied in 4-6 doses. A survey on untreated plots in agricultural fields all over Denmark showed that S. media was resistant to SU herbicides in 15% of the fields.

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GENERAL

Per Kudsk
The only confirmed case of sulfonylurea resistance in Europe. The field is now set-aside land.

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GENERAL

Per Kudsk
Kudsk, P., S.K. Mathiassen and J.C. Cotterman. Sulfonylrea resistance in Stellaria media.

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ACADEMIC ASPECTS

Confirmation Tests

Field, 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 Group B/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 B/2 resistant Common Chickweed from Denmark 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 B/2 resistant Common Chickweed from Denmark please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

PER KUDSK

Department Of Weed Control And Pesticide Ecology
Plant Science Division
PO Box 442339, 606 Rayburn St
Slagelse, 4200
Denmark
SOLVEJG MATHIASSEN
Senior Scientist
Aarhus University, Science and Technology
Dept. of Agroecology
P.o. Box 30
Slagelse, 4200, Slagelse Municipality
Denmark
Email Solvejg Mathiassen

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Denmark have been instrumental in providing you this information. Particular thanks is given to Per Kudsk, and Solvejg Mathiassen 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 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed10959
2 Canada (Alberta) CanadaAlberta1988 Cereals, and Wheat chlorsulfuron, ethametsulfuron-methyl, imazamethabenz-methyl, metsulfuron-methyl, sulfometuron-methyl, and thifensulfuron-methyl 7 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed481
3 Canada (Saskatchewan) CanadaSaskatchewan2005 Spring Barley, and Wheat thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5322
4 Canada (Manitoba) CanadaManitoba2008 Peas thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5630
5 ChinaChina 2010 Winter wheat fluroxypyr, and MCPA 9 Synthetic Auxins (O/4)
168Stellaria mediaCommon Chickweed5658
6 DenmarkDenmark 1991 Spring Barley, and Wheat chlorsulfuron, florasulam, iodosulfuron-methyl-sodium, and tribenuron-methyl 13 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed86
7 FinlandFinland 2013 Spring Barley tribenuron-methyl 139 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed9946
8 FranceFrance 2012 Wheat florasulam, iodosulfuron-methyl-sodium, mesosulfuron-methyl, metsulfuron-methyl, and thifensulfuron-methyl 17 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5688
9 GermanyGermany 1978 Corn (maize) atrazine 18 Photosystem II inhibitors (C1/5)
168Stellaria mediaCommon Chickweed435
10 GermanyGermany 2011 Rapeseed, Spring Barley, and Wheat amidosulfuron, florasulam, imazamox, iodosulfuron-methyl-sodium, mesosulfuron-methyl, nicosulfuron, pyroxsulam, thifensulfuron-methyl, tribenuron-methyl, triflusulfuron-methyl, and tritosulfuron 18 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed6744
11 IrelandIreland 1996 Cereals metsulfuron-methyl 81 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5089
12 LatviaLatvia 2016 Winter wheat amidosulfuron 174 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed15068
13 New ZealandNew Zealand 1995 Cereals chlorsulfuron 30 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed161
14 NorwayNorway 2002 Cereals iodosulfuron-methyl-sodium, metsulfuron-methyl, and tribenuron-methyl 31 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5165
15 South AfricaSouth Africa 2002 Cereals chlorsulfuron, metsulfuron-methyl, thifensulfuron-methyl, and triasulfuron 37 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5193
16 SwedenSweden 1995 Spring Barley, Spring wheat, and Winter wheat chlorsulfuron, florasulam, and tribenuron-methyl 40 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed510
17 United KingdomUnited Kingdom 1985 Cereals, and Wheat mecoprop 44 Synthetic Auxins (O/4)
168Stellaria mediaCommon Chickweed358
18 United KingdomUnited Kingdom 2000 Cereals florasulam, and metsulfuron-methyl 44 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5088
19 United States (Virginia) United StatesVirginia2008 Wheat thifensulfuron-methyl 45 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5373
20 United States (Maryland) United StatesMaryland2009 Wheat chlorsulfuron, mesosulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl 45 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5374
21 United States (Pennsylvania) United StatesPennsylvania2010 Alfalfa, Spring Barley, and Wheat pyroxsulam, thifensulfuron-methyl, and tribenuron-methyl 45 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed7898
22 United States (Delaware) United StatesDelaware2012 Wheat thifensulfuron-methyl, and tribenuron-methyl 45 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed5708
23 United States (Kentucky) United StatesKentucky2013 Wheat chlorsulfuron, flucarbazone-sodium, thifensulfuron-methyl, and tribenuron-methyl 45 ALS inhibitors (B/2)
168Stellaria mediaCommon Chickweed7883
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, October 17, 2017 .  Available  www.weedscience.org
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