International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT RUSSIAN-THISTLE
(Salsola tragus)


Inhibition of Acetolactate Synthase (B/2)

Canada, Alberta
INTRODUCTION RUSSIAN-THISTLE
Russian-thistle (Salsola tragus) is a dicot weed in the Chenopodiaceae family.  In Alberta this weed first evolved resistance to Group B/2 herbicides in 2007 and infests Spring Barley, and Wheat.   Group B/2 herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to thifensulfuron-methyl, 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 Jan 19, 2014 )

Common NameRussian-thistle
SpeciesSalsola tragus
GroupInhibition of Acetolactate Synthase (B/2)
Herbicidesthifensulfuron-methyl, and tribenuron-methyl
LocationCanada, Alberta
Year2007
Situation(s)Spring Barley, and Wheat
Contributors - (Alphabetically)Hugh Beckie 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Russian-thistle biotype with this Russian-thistle 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 Russian-thistle 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 Russian-thistle from Alberta please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

HUGH BECKIE
Professor of Crop Weed Science...Canadian Expat
University of Western Australia
Australian Herbicide Resistance Initiative
School of Agriculture and Environment
35 Stirling Highway
Crawley, 6009, Western Australia
Australia
Email Hugh Beckie

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Alberta have been instrumental in providing you this information. Particular thanks is given to Hugh Beckie for providing detailed information.
Herbicide Resistant Russian-thistle Globally
(Salsola tragus)
Herbicide Resistant Russian-thistle Globally
(Salsola tragus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Russian-thistle Globally
(Salsola tragus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 2019 Soybean glyphosate 48 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
147Salsola tragusRussian-thistle19218
2 Canada (Saskatchewan) CanadaSaskatchewan1989 Wheat chlorsulfuron 7 Inhibition of Acetolactate Synthase (B/2)
147Salsola tragusRussian-thistle5067
3 Canada (Alberta) CanadaAlberta2007 Spring Barley, and Wheat thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase (B/2)
147Salsola tragusRussian-thistle7831
4 United States (Washington) United StatesWashington1987 Wheat chlorsulfuron 45 Inhibition of Acetolactate Synthase (B/2)
147Salsola tragusRussian-thistle231
5 United States (Montana) United StatesMontana1987 Cropland, and Wheat chlorsulfuron 45 Inhibition of Acetolactate Synthase (B/2)
147Salsola tragusRussian-thistle411
6 United States (Idaho) United StatesIdaho1990 Wheat chlorsulfuron 45 Inhibition of Acetolactate Synthase (B/2)
147Salsola tragusRussian-thistle512
7 United States (Oregon) United StatesOregon1993 Wheat chlorsulfuron, metsulfuron-methyl, and triasulfuron 45 Inhibition of Acetolactate Synthase (B/2)
147Salsola tragusRussian-thistle1173
8 United States (California) United StatesCalifornia1994 Roadsides chlorsulfuron, and sulfometuron-methyl 45 Inhibition of Acetolactate Synthase (B/2)
147Salsola tragusRussian-thistle1036
9 United States (Montana) United StatesMontana2015 Fallow, and Wheat glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
147Salsola tragusRussian-thistle12032
10 United States (Washington) United StatesWashington2015 Fallow glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
147Salsola tragusRussian-thistle18160
11 United States (Oregon) United StatesOregon2016 Fallow glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
147Salsola tragusRussian-thistle13055
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