HRAC GROUP 2 (LEGACY B) RESISTANT CALOMBA DAISY
(Pentzia suffruticosa)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Australia, South Australia

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INTRODUCTION CALOMBA DAISY Calomba daisy (Pentzia suffruticosa) is a dicot weed in the Asteraceae family.  In South Australia this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2004 and infests Cereals.   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 15, 2005 ) Common Name Calomba daisy Species Pentzia suffruticosa Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides metsulfuron-methyl Location Australia, South Australia Year 2004 Situation(s) Cereals Contributors - (Alphabetically) Peter Boutsalis, and Christopher Preston  Edit this Case  |  Add New Case of Resistance  |  Add Note

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

CONTRIBUTING WEED SCIENTISTS PETER BOUTSALIS Postdoctural Fellow/ Consultant University Of Adelaide / Plant Science Consulting Plant And Pest Science 800 N Lindbergh Blvd 02G Adelaide, 5064, South Australia Australia Email Peter Boutsalis CHRISTOPHER PRESTON Postdoctural Fellow/ Consultant University Of Adelaide - Waite Campus Crc For Australian Weed Management And School Of Agriculture Box 2146 Adelaide, 5064, South Australia Australia Email Christopher Preston

ACKNOWLEDGEMENTS The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in South Australia have been instrumental in providing you this information. Particular thanks is given to Peter Boutsalis, and Christopher Preston for providing detailed information.

Herbicide Resistant Calomba daisy Globally (Pentzia suffruticosa) Herbicide Resistant Calomba daisy Globally (Pentzia suffruticosa) Drag a column header and drop it here to group by that column Herbicide Resistant Calomba daisy Globally (Pentzia suffruticosa) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Australia (South Australia) Australia South Australia 2004 Cereals metsulfuron-methyl 1 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 231 Pentzia suffruticosa Calomba daisy 5241

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