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

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT RUSSIAN-THISTLE
(Salsola tragus)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

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 2 (Legacy B) herbicides in 1994 and infests Roadsides. Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ). Research has shown that these particular biotypes are resistant to chlorsulfuron, and sulfometuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) 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 Dec 01, 2000 )
Common Name	Russian-thistle
Species	Salsola tragus
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	chlorsulfuron, and sulfometuron-methyl
Location	United States, California
Year	1994
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 HRAC Group 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 2 (Legacy B) 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.

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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