<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Capsella bursa-pastoris from Denmark

International Survey of Herbicide-Resistant Weeds

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Wednesday, April 17, 2024

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.

QUIK STATS (last updated May 12, 2014 )
Common Name	Shepherd's-purse
Species	Capsella bursa-pastoris
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	florasulam, and tribenuron-methyl
Location	Denmark
Year	2012
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.

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Herbicide Resistant Shepherd's-purse Globally
(Capsella bursa-pastoris)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Canada (Saskatchewan)

2008

Wheat

imazamox, imazethapyr, thifensulfuron-methyl, and tribenuron-methyl