HRAC GROUP 2 (LEGACY B) RESISTANT COWCOCKLE
(Vaccaria hispanica)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Canada, Alberta

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INTRODUCTION COWCOCKLE Cowcockle (Vaccaria hispanica) is a dicot weed in the Caryophyllaceae family.  In Alberta this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2012 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 metsulfuron-methyl, 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 Jan 19, 2014 ) Common Name Cowcockle Species Vaccaria hispanica Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides metsulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl Location Canada, Alberta Year 2012 Situation(s) Wheat Contributors - (Alphabetically) Hugh Beckie  Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE OTHER CONTACTS Hugh Beckie Reported by Dale Fedoruk/Norm Flore, Viterra, Red Deer, AB Edit this Note  |  Add New Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse trials comparing a known susceptible Cowcockle biotype with this Cowcockle 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 Cowcockle 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 Cowcockle from Alberta please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

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 Alberta have been instrumental in providing you this information. Particular thanks is given to Hugh Beckie for providing detailed information.

Herbicide Resistant Cowcockle Globally (Vaccaria hispanica) Herbicide Resistant Cowcockle Globally (Vaccaria hispanica) Drag a column header and drop it here to group by that column Herbicide Resistant Cowcockle Globally (Vaccaria hispanica) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Canada (Alberta) Canada Alberta 2012 Wheat metsulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 275 Vaccaria hispanica Cowcockle 5616

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