International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT ANNUAL SOWTHISTLE
(Sonchus oleraceus)


ALS inhibitors (B/2)

Australia, Queensland
INTRODUCTION ANNUAL SOWTHISTLE
Annual Sowthistle (Sonchus oleraceus) is a dicot weed in the Asteraceae family.  In Queensland this weed first evolved resistance to Group B/2 herbicides in 1990 and infests Wheat.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to chlorsulfuron and they may be cross-resistant to other Group B/2 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 Jan 11, 2001 )

Common NameAnnual Sowthistle
SpeciesSonchus oleraceus
GroupALS inhibitors (B/2)
Herbicideschlorsulfuron
LocationAustralia, Queensland
Year1990
Situation(s)Wheat
Contributors - (Alphabetically)Steve Walker 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Steve Walker
Northeastern Australian Cereal Belt.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse 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 B/2 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 B/2 resistant Annual Sowthistle from Queensland please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

STEVE WALKER
Principal Agronomist
Farming Systems Institute, Qdpi
Leslie Research Centre
303 North Roberts
PO Box 200201,
Toowoomba, 4350, Queensland
Australia
Email Steve Walker

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Queensland have been instrumental in providing you this information. Particular thanks is given to Steve Walker 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, June 20, 2019 .  Available  www.weedscience.org
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