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

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)

United States, Montana

INTRODUCTION		RUSSIAN-THISTLE
Russian-thistle (Salsola tragus) is a dicot weed in the Chenopodiaceae family. In Montana this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2015 and infests Fallow, and Wheat. 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 03, 2016 )
Common Name	Russian-thistle
Species	Salsola tragus
Group	Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicides	glyphosate
Location	United States, Montana
Year	2015
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 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 Montana 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

Assistant Professor-Weed Science Kansas State University Agricultural Research Center-Hays 1232 240th Avenue Hays, 67601, Kansas 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 Montana have been instrumental in providing you this information. Particular thanks is given to Prashant Jha, and Vipan Kumar 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