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

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)

Canada, Saskatchewan

INTRODUCTION		SHEPHERD'S-PURSE
Shepherd's-purse (Capsella bursa-pastoris) is a dicot weed in the Brassicaceae family. In Saskatchewan this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2008 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 imazamox, imazethapyr, thifensulfuron-methyl, 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 Feb 08, 2010 )
Common Name	Shepherd's-purse
Species	Capsella bursa-pastoris
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	imazamox, imazethapyr, thifensulfuron-methyl, and tribenuron-methyl
Location	Canada, Saskatchewan
Year	2008
Situation(s)	Wheat
Contributors - (Alphabetically)	Hugh Beckie
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse 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

The mechanism of resistance for this biotype is either unknown or has not been entered in the database. If you know anything about the mechanism of resistance for this biotype then please update the database.

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 Saskatchewan please update the database.

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CONTRIBUTING WEED SCIENTISTS

HUGH BECKIE

Professor of Crop Weed Science...Canadian Expat University of Western Australia Australian Herbicide Resistance Initiative School of Agriculture and Environment 35 Stirling Highway Crawley, 6009, Western Australia Australia Email Hugh Beckie

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Saskatchewan have been instrumental in providing you this information. Particular thanks is given to Hugh Beckie 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