INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

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

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Australia, South Australia
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.

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QUIK STATS (last updated Mar 15, 2005 )

Common NameCalomba daisy
SpeciesPentzia suffruticosa
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesmetsulfuron-methyl
LocationAustralia, South Australia
Year2004
Situation(s)Cereals
Contributors - (Alphabetically)Peter Boutsalis, and Christopher Preston 
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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.
 
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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)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (South Australia) AustraliaSouth Australia2004 Cereals metsulfuron-methyl 1 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
 		231Pentzia suffruticosaCalomba daisy5241
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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Thursday, November 21, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.