International Survey of Herbicide-Resistant Weeds

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


Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)

Argentina, West of Buenos Aires Province
INTRODUCTION RUSSIAN-THISTLE
Russian-thistle (Salsola tragus) is a dicot weed in the Chenopodiaceae family.  In Argentina this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2019 and infests Soybean.   Group 9 (Legacy G) herbicides are known as Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group 9 (Legacy G) 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 10, 2021 )

Common NameRussian-thistle
SpeciesSalsola tragus
GroupInhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicidesglyphosate
LocationArgentina, West of Buenos Aires Province
Year2019
Situation(s)Soybean
Contributors - (Alphabetically)Ramón Gigón, and Marcos Yanniccari 
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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 HRAC Group 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 9 (Legacy G) resistant Russian-thistle from Argentina please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

RAMÓN GIGÓN
Eng.agronomy Master Science weed management
ASACIM
Azcuenaga 320
TRES ARROYOS, 7500, Buenos Aires
Argentina
Email Ramón Gigón
MARCOS YANNICCARI
Dr
CONICET
Chacra Experimental Integrada Barrow
RN 3 km 487 cc 50
Tres Arroyos, 7500, Buenos Aires
Argentina
Email Marcos Yanniccari

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Argentina have been instrumental in providing you this information. Particular thanks is given to Ramón Gigón, and Marcos Yanniccari 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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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, December 8, 2021 .  Available  www.weedscience.org
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