HRAC GROUP 2 (LEGACY B) RESISTANT NARROWLEAF HAWKSBEARD
(Crepis tectorum)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Canada, Alberta

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INTRODUCTION NARROWLEAF HAWKSBEARD Narrowleaf Hawksbeard (Crepis tectorum) is a dicot weed in the Asteraceae family.  In Alberta this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2011 and infests Grass seed.   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 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 Mar 20, 2012 ) Common Name Narrowleaf Hawksbeard Species Crepis tectorum Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides metsulfuron-methyl Location Canada, Alberta Year 2011 Situation(s) Grass seed Contributors - (Alphabetically) Hugh Beckie  Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE GENERAL Hugh Beckie Investigated by C. Yoder, Forage Seed Specialist, AARD Edit this Note  |  Add New Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse trials comparing a known susceptible Narrowleaf Hawksbeard biotype with this Narrowleaf Hawksbeard 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 Narrowleaf Hawksbeard 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 Narrowleaf Hawksbeard 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 Narrowleaf Hawksbeard Globally (Crepis tectorum) Herbicide Resistant Narrowleaf Hawksbeard Globally (Crepis tectorum) Drag a column header and drop it here to group by that column Herbicide Resistant Narrowleaf Hawksbeard Globally (Crepis tectorum) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Canada (Alberta) Canada Alberta 2011 Grass seed metsulfuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 271 Crepis tectorum Narrowleaf Hawksbeard 5606

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