INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT SHEPHERD'S-PURSE
(Capsella bursa-pastoris)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Denmark
INTRODUCTION SHEPHERD'S-PURSE
Shepherd's-purse (Capsella bursa-pastoris) is a dicot weed in the Brassicaceae family.  In Denmark this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2012 and infests Spring Barley.   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 florasulam, and tribenuron-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 May 12, 2014 )

Common NameShepherd's-purse
SpeciesCapsella bursa-pastoris
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesflorasulam, and tribenuron-methyl
LocationDenmark
Year2012
Situation(s)Spring Barley
Contributors - (Alphabetically)Solvejg Mathiassen 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Solvejg Mathiassen

April 2017 Update

Capsella bursa-pastoris

Still only one verified case. Reference: Reiss A. (2014):  Characterisation of a Capsella bursa- pastoris biotype resistant to ALS inhibitors, Master thesis, Department of Agroecology, Aarhus University

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GENERAL

Solvejg Mathiassen
ALS resistant CAPBP was sampled in 2012 in spring barley. The field was sprayed with sulfonylureas 4 of 5 preceding years and crops established by reduced tillage. The susceptibility to tribenuron and florasulam was examined in pot experiments with 6 doses, and compared to a susceptible reference. The results showed a high level of resistance to tribenuron (RI=75) and a low level of resistance to florasulam (4<RI<10).

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GENETICS

Solvejg Mathiassen
TSR analysis showed a heterozygous mutation at Trp-574 of the ALS gene.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Shepherd's-purse biotype with this Shepherd's-purse 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 Shepherd's-purse 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 Shepherd's-purse 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 2 (Legacy B) resistant Shepherd's-purse from Denmark please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

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 Solvejg Mathiassen for providing detailed information.
Herbicide Resistant Shepherd's-purse Globally
(Capsella bursa-pastoris)
Herbicide Resistant Shepherd's-purse Globally
(Capsella bursa-pastoris)
Drag a column header and drop it here to group by that column
Herbicide Resistant Shepherd's-purse Globally
(Capsella bursa-pastoris)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Saskatchewan) CanadaSaskatchewan2008 Wheat imazamox, imazethapyr, thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
41Capsella bursa-pastorisShepherd's-purse5381
2 Canada (Alberta) CanadaAlberta2011 Wheat thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
41Capsella bursa-pastorisShepherd's-purse5623
3 ChinaChina 2009 Winter wheat tribenuron-methyl 9 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
41Capsella bursa-pastorisShepherd's-purse5502
4 DenmarkDenmark 2012 Spring Barley florasulam, and tribenuron-methyl 13 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
41Capsella bursa-pastorisShepherd's-purse8910
5 IsraelIsrael 2000 Roadsides imazapyr 23 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
41Capsella bursa-pastorisShepherd's-purse5465
6 NorwayNorway 2019 Wheat iodosulfuron-methyl-Na 31 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
41Capsella bursa-pastorisShepherd's-purse18169
7 PolandPoland 1984 Orchards simazine 33 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
41Capsella bursa-pastorisShepherd's-purse166
8 United States (Oregon) United StatesOregon2007 Alfalfa hexazinone, and metribuzin 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
41Capsella bursa-pastorisShepherd's-purse5366
Literature about Similar Cases

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