International Survey of Herbicide-Resistant Weeds

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HRAC GROUP 2 (LEGACY B) RESISTANT SPINY SOWTHISTLE
(Sonchus asper)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

France, Northern France
INTRODUCTION SPINY SOWTHISTLE
Spiny Sowthistle (Sonchus asper) is a dicot weed in the Asteraceae family.  In France this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2015 and infests Chicory.   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 rimsulfuron 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 Nov 21, 2016 )

Common NameSpiny Sowthistle
SpeciesSonchus asper
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesrimsulfuron
LocationFrance, Northern France
Year2015
Situation(s)Chicory
Contributors - (Alphabetically)Christophe Délye 
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NOTES ABOUT THIS BIOTYPE

MECHANISM

Christophe Délye

Fact Sheet in French about this Case

Résistances aux herbicides : au nord, c’étaient les laiterons!

 

Target Site Resistance identified (mutations at codon 197: Thr, Ser or Leu).

 

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Spiny Sowthistle biotype with this Spiny 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 HRAC Group 2 resistant Spiny 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

Studies on the mechanism of resistance of Group 2 (Legacy B) resistant Spiny Sowthistle from France indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Spiny Sowthistle from France please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

CHRISTOPHE DÉLYE
Chargé de Recherches
INRA
Agroécologie
17 rue de Sully
Dijon, F-21000, Burgundy
France
Email Christophe Délye
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in France have been instrumental in providing you this information. Particular thanks is given to Christophe Délye for providing detailed information.
Herbicide Resistant Spiny Sowthistle Globally
(Sonchus asper)
Herbicide Resistant Spiny Sowthistle Globally
(Sonchus asper)
Drag a column header and drop it here to group by that column
Herbicide Resistant Spiny Sowthistle Globally
(Sonchus asper)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Alberta) CanadaAlberta1996 Pastures, and Spring Barley chlorsulfuron, metsulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
163Sonchus asperSpiny Sowthistle1153
2 FranceFrance 1980 Corn (maize) atrazine 17 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
163Sonchus asperSpiny Sowthistle473
3 FranceFrance 2015 Chicory rimsulfuron 17 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
163Sonchus asperSpiny Sowthistle14058
4 NorwayNorway 2006 Spring Barley, and Spring wheat iodosulfuron-methyl-Na, and tribenuron-methyl 31 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
163Sonchus asperSpiny Sowthistle10976
5 United KingdomUnited Kingdom 2016 Wheat imazamox, metsulfuron-methyl, and thifensulfuron-methyl 44 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
163Sonchus asperSpiny Sowthistle18185
6 United States (Washington) United StatesWashington2000 Lentils, and Wheat imazamox, and thifensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
163Sonchus asperSpiny Sowthistle5186
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