International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP G/9 RESISTANT RUSSIAN-THISTLE
(Salsola tragus)


EPSP synthase inhibitors (G/9)

United States, Montana
INTRODUCTION RUSSIAN-THISTLE
Russian-thistle (Salsola tragus) is a dicot weed in the Chenopodiaceae family.  In United States this weed first evolved resistance to Group G/9 herbicides in 2015 and infests Fallow, and Wheat.   Group G/9 herbicides are known as EPSP synthase inhibitors (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group G/9 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 03, 2016 )

Common NameRussian-thistle
SpeciesSalsola tragus
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationUnited States
Year2015
Situation(s)Fallow, and Wheat
Contributors - (Alphabetically)Prashant Jha, and Vipan Kumar 
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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 G/9 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 G/9 resistant Russian-thistle from United States please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

PRASHANT JHA
Associate Professor-Weed Science
Montana State University-Bozeman
Southern Agricultural Research Center
748 Railroad Highway
Huntley, 59037, Montana
United States
Email Prashant Jha
Web   : Web Site Link
VIPAN KUMAR
Postdoctoral Research Associate
Montana State University
Southern Ag Research Center
748 Railroad Highway
Huntley, 59037, Montana
United States
Email Vipan Kumar
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in United States have been instrumental in providing you this information. Particular thanks is given to Prashant Jha, and Vipan Kumar 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 (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.  Friday, March 24, 2017 .  Available  www.weedscience.org
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