International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT YELLOW FOXTAIL
(Setaria pumila (=S. glauca))


ALS inhibitors (B/2)

United States, Minnesota
INTRODUCTION YELLOW FOXTAIL
Yellow Foxtail (Setaria pumila (=S. glauca)) is a monocot weed in the Poaceae family.  In Minnesota this weed first evolved resistance to Group B/2 herbicides in 1997 and infests Soybean.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to imazethapyr and they may be cross-resistant to other Group B/2 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 Sep 15, 2000 )

Common NameYellow Foxtail
SpeciesSetaria pumila (=S. glauca)
GroupALS inhibitors (B/2)
Herbicidesimazethapyr
LocationUnited States, Minnesota
Year1997
Situation(s)Soybean
Contributors - (Alphabetically)Jeffrey Gunsolus 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Jeffrey Gunsolus
Dodge Co. MN in South Eastern Minnesota.

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GENERAL

Jeffrey Gunsolus
ALS-resistance found by accident while putting on a Immi Corn - Lightning Trial. American Cyanamid and field data could indicate no cross-resistance to the SU chemistry.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Laboratory trials comparing a known susceptible Yellow Foxtail biotype with this Yellow Foxtail 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 B/2 resistant Yellow Foxtail 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 B/2 resistant Yellow Foxtail from Minnesota please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JEFFREY GUNSOLUS
Professor and Extension Weed Scientist
University Of Minnesota
Department of Agronomy and Plant Genetics
411 Borlaug Hall
1991 Upper Buford Circle
St. Paul, 55108, Minnesota
United States
Email Jeffrey Gunsolus
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Minnesota have been instrumental in providing you this information. Particular thanks is given to Jeffrey Gunsolus for providing detailed information.
Herbicide Resistant Yellow Foxtail Globally
(Setaria pumila (=S. glauca))
Herbicide Resistant Yellow Foxtail Globally
(Setaria pumila (=S. glauca))
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Herbicide Resistant Yellow Foxtail Globally
(Setaria pumila (=S. glauca))
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario1981 Corn (maize), and Cropland atrazine 7 Photosystem II inhibitors (C1/5)
150Setaria pumila (=S. glauca)Yellow Foxtail64
2 FranceFrance 1981 Corn (maize) atrazine 17 Photosystem II inhibitors (C1/5)
150Setaria pumila (=S. glauca)Yellow Foxtail469
3 SpainSpain 1987 Corn (maize) atrazine 38 Photosystem II inhibitors (C1/5)
150Setaria pumila (=S. glauca)Yellow Foxtail179
4 United States (Maryland) United StatesMaryland1984 Corn (maize), and Cropland atrazine, cyanazine, and simazine 45 Photosystem II inhibitors (C1/5)
150Setaria pumila (=S. glauca)Yellow Foxtail427
5 United States (Minnesota) United StatesMinnesota1997 Soybean imazethapyr 45 ALS inhibitors (B/2)
150Setaria pumila (=S. glauca)Yellow Foxtail506
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