International Survey of Herbicide-Resistant Weeds

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


ALS inhibitors (B/2)

Norway
INTRODUCTION SPINY SOWTHISTLE
Spiny Sowthistle (Sonchus asper) is a dicot weed in the Asteraceae family.  In Norway this weed first evolved resistance to Group B/2 herbicides in 2006 and infests Spring Barley, and Spring 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 iodosulfuron-methyl-sodium, and tribenuron-methyl 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 Mar 09, 2015 )

Common NameSpiny Sowthistle
SpeciesSonchus asper
GroupALS inhibitors (B/2)
Herbicidesiodosulfuron-methyl-sodium, and tribenuron-methyl
LocationNorway
Year2006
Situation(s)Spring Barley, and Spring wheat
Contributors - (Alphabetically)Jan Netland 
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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 Group B/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

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 Spiny Sowthistle from Norway please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JAN NETLAND
The Norwegian Crop Research Institute
Plant Protection Centre
Department Of Herbology
Exotic & Invasive Weed Research
One Shields Ave, Mail Stop 4
Fellesbygget, N-1432, ÅS
Norway
Email Jan Netland

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Norway have been instrumental in providing you this information. Particular thanks is given to Jan Netland 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 ALS inhibitors (B/2)
163Sonchus asperSpiny Sowthistle1153
2 FranceFrance 1980 Corn (maize) atrazine 17 Photosystem II inhibitors (C1/5)
163Sonchus asperSpiny Sowthistle473
3 FranceFrance 2015 Chicory rimsulfuron 17 ALS inhibitors (B/2)
163Sonchus asperSpiny Sowthistle14058
4 NorwayNorway 2006 Spring Barley, and Spring wheat iodosulfuron-methyl-sodium, and tribenuron-methyl 31 ALS inhibitors (B/2)
163Sonchus asperSpiny Sowthistle10976
5 United States (Washington) United StatesWashington2000 Lentils, and Wheat imazamox, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
163Sonchus asperSpiny Sowthistle5186
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, April 24, 2017 .  Available  www.weedscience.org
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