<b>HRAC Group 9</b> <font size='2'> (Legacy G) </font> resistant Salsola tragus from Argentina

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

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.

QUIK STATS (last updated Mar 10, 2021 )
Common Name	Russian-thistle
Species	Salsola tragus
Group	Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicides	glyphosate
Location	Argentina, West of Buenos Aires Province
Year	2019
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.

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Herbicide Resistant Russian-thistle Globally
(Salsola tragus)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Argentina

2019

Soybean

glyphosate

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

Canada (Saskatchewan)

1989

Wheat

chlorsulfuron