International Survey of Herbicide-Resistant Weeds

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


ALS inhibitors (B/2)

United States, California
INTRODUCTION RUSSIAN-THISTLE
Russian-thistle (Salsola tragus) is a dicot weed in the Chenopodiaceae family.  In California this weed first evolved resistance to Group B/2 herbicides in 1994 and infests Roadsides.   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 sulfometuron-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 Dec 01, 2000 )

Common NameRussian-thistle
SpeciesSalsola tragus
GroupALS inhibitors (B/2)
Herbicideschlorsulfuron, and sulfometuron-methyl
LocationUnited States, California
Year1994
Situation(s)Roadsides
Contributors - (Alphabetically)Jodie Holt, and Timothy Prather 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Timothy Prather
Stanislaus, SanJoaquin

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GENERAL

Timothy Prather
California department of transportation has use records - mapped out use records. Sampled from different sites. 3-9 application of chlorsuluron and metsulfuron. Interstate 5, Hwy 152, Hwy 205, Hwy 580, Hwy 99.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse 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 California please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JODIE HOLT
Professor and Associate Dean
University of California
Botany and Plant Sciences
900 University Drive
Riverside, 92521, California
United States
Email Jodie Holt
Web   : Web Site Link
TIMOTHY PRATHER
Professor
University Of Idaho
Plant, Soil and Entomological Sciences
875 Perimeter Drive MS 2339 Agricultural Science Building Room 317
Moscow, 83844-2339, Idaho
United States
Email Timothy Prather
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in California have been instrumental in providing you this information. Particular thanks is given to Jodie Holt, and Timothy Prather 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 Canada (Saskatchewan) CanadaSaskatchewan1989 Wheat chlorsulfuron 7 ALS inhibitors (B/2)
147Salsola tragusRussian-thistle5067
2 Canada (Alberta) CanadaAlberta2007 Spring Barley, and Wheat thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
147Salsola tragusRussian-thistle7831
3 United States (Washington) United StatesWashington1987 Wheat chlorsulfuron 45 ALS inhibitors (B/2)
147Salsola tragusRussian-thistle231
4 United States (Montana) United StatesMontana1987 Cropland, and Wheat chlorsulfuron 45 ALS inhibitors (B/2)
147Salsola tragusRussian-thistle411
5 United States (Idaho) United StatesIdaho1990 Wheat chlorsulfuron 45 ALS inhibitors (B/2)
147Salsola tragusRussian-thistle512
6 United States (Oregon) United StatesOregon1993 Wheat chlorsulfuron, metsulfuron-methyl, and triasulfuron 45 ALS inhibitors (B/2)
147Salsola tragusRussian-thistle1173
7 United States (California) United StatesCalifornia1994 Roadsides chlorsulfuron, and sulfometuron-methyl 45 ALS inhibitors (B/2)
147Salsola tragusRussian-thistle1036
8 United States (Montana) United StatesMontana2015 Fallow, and Wheat glyphosate 45 EPSP synthase inhibitors (G/9)
147Salsola tragusRussian-thistle12032
9 United States (Washington) United StatesWashington2015 Fallow glyphosate 45 EPSP synthase inhibitors (G/9)
147Salsola tragusRussian-thistle18160
10 United States (Oregon) United StatesOregon2016 Fallow glyphosate 45 EPSP synthase inhibitors (G/9)
147Salsola tragusRussian-thistle13055
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, June 26, 2019 .  Available  www.weedscience.org
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