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

International Survey of Herbicide-Resistant Weeds

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Thursday, October 31, 2024

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

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Norway, Viken

INTRODUCTION		SHEPHERD'S-PURSE
Shepherd's-purse (Capsella bursa-pastoris) is a dicot weed in the Brassicaceae family. In Norway this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2019 and infests 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 iodosulfuron-methyl-Na 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 Oct 24, 2019 )
Common Name	Shepherd's-purse
Species	Capsella bursa-pastoris
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	iodosulfuron-methyl-Na
Location	Norway, Viken
Year	2019
Situation(s)	Wheat
Contributors - (Alphabetically)	Björn Ringselle, and Magne Skårn
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NOTES ABOUT THIS BIOTYPE

MECHANISM

Björn Ringselle

The sequencing clearly showed that Pro197 (CCT) had mutated to Thr197 (ACT) in both plants

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ACADEMIC ASPECTS

Confirmation Tests

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 Norway 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 Norway please update the database.

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CONTRIBUTING WEED SCIENTISTS

BJÖRN RINGSELLE

Researcher/Forsker Norwegian Institute of Bioeconony Research (NIBIO) P.O. Box. 115 Høgskoleveien 7, 1434, Ås Norway Email Björn Ringselle

MAGNE SKÅRN

Engineer Norwegian Institute of Bioeconony Research (NIBIO) Biotechnology and Plant Health Høgskolevegen 7 Ås, 1433, Akershus Norway Email Magne Skårn

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Norway have been instrumental in providing you this information. Particular thanks is given to Björn Ringselle, and Magne Skårn 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