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

International Survey of Herbicide-Resistant Weeds

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

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Israel

INTRODUCTION		SHEPHERD'S-PURSE
Shepherd's-purse (Capsella bursa-pastoris) is a dicot weed in the Brassicaceae family. In Israel this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2000 and infests Roadsides. 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 imazapyr 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 Dec 17, 2009 )
Common Name	Shepherd's-purse
Species	Capsella bursa-pastoris
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	imazapyr
Location	Israel
Year	2000
Situation(s)	Roadsides
Contributors - (Alphabetically)	Baruch Rubin
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ACADEMIC ASPECTS

Confirmation Tests

Field, 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 indicate that the inheritance is determined by a nuclear trait. 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 Israel 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 Israel please update the database.

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CONTRIBUTING WEED SCIENTISTS

BARUCH RUBIN

Professor Hebrew University Of Jerusalem Inst. Plant Sci. & Genetics In Agriculture Faculty Of Agric. Food & Environm. Rehovot, 76100, Israel Israel Email Baruch Rubin

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