International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT ANNUAL SOWTHISTLE
(Sonchus oleraceus)


Synthetic Auxins (O/4)

Australia, Victoria
INTRODUCTION ANNUAL SOWTHISTLE
Annual Sowthistle (Sonchus oleraceus) is a dicot weed in the Asteraceae family.  In Victoria this weed first evolved resistance to Group O/4 herbicides in 2015 and infests Wheat.   Group O/4 herbicides are known as Synthetic Auxins (Synthetic auxins (action like indoleacetic acid)).  Research has shown that these particular biotypes are resistant to 2,4-D and they may be cross-resistant to other Group O/4 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 Dec 02, 2016 )

Common NameAnnual Sowthistle
SpeciesSonchus oleraceus
GroupSynthetic Auxins (O/4)
Herbicides2,4-D
LocationAustralia, Victoria
Year2015
Situation(s)Wheat
Contributors - (Alphabetically)Peter Boutsalis, and Christopher Preston 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Annual Sowthistle biotype with this Annual Sowthistle 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 Group O/4 resistant Annual Sowthistle 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 O/4 resistant Annual Sowthistle from Victoria 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 Victoria have been instrumental in providing you this information. Particular thanks is given to Peter Boutsalis, and Christopher Preston for providing detailed information.
Herbicide Resistant Annual Sowthistle Globally
(Sonchus oleraceus)
Herbicide Resistant Annual Sowthistle Globally
(Sonchus oleraceus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Annual Sowthistle Globally
(Sonchus oleraceus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Queensland) AustraliaQueensland1990 Wheat chlorsulfuron 1 ALS inhibitors (B/2)
164Sonchus oleraceusAnnual Sowthistle23
2 Australia (Victoria) AustraliaVictoria2010 Spring Barley, and Wheat chlorsulfuron 1 ALS inhibitors (B/2)
164Sonchus oleraceusAnnual Sowthistle7844
3 Australia (New South Wales ) AustraliaNew South Wales 2014 Cotton, and Fallow glyphosate 1 EPSP synthase inhibitors (G/9)
164Sonchus oleraceusAnnual Sowthistle7892
4 Australia (South Australia) AustraliaSouth Australia2015 Wheat 2,4-D 1 Synthetic Auxins (O/4)
164Sonchus oleraceusAnnual Sowthistle10988
5 Australia (South Australia) AustraliaSouth Australia2015 Wheat chlorsulfuron 1 ALS inhibitors (B/2)
164Sonchus oleraceusAnnual Sowthistle10989
6 Australia (Victoria) AustraliaVictoria2015 Wheat 2,4-D 1 Synthetic Auxins (O/4)
164Sonchus oleraceusAnnual Sowthistle15056
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, August 17, 2017 .  Available  www.weedscience.org
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