International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT GIANT GREEN FOXTAIL
(Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea))


ALS inhibitors (B/2)

United States, Minnesota
INTRODUCTION GIANT GREEN FOXTAIL
Giant Green Foxtail (Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)) is a monocot weed in the Poaceae family.  In Minnesota this weed first evolved resistance to Group B/2 herbicides in 1996 and infests Corn (maize), and 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, nicosulfuron, and primisulfuron-methyl 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 Nov 20, 2000 )

Common NameGiant Green Foxtail
SpeciesSetaria viridis var. major (=var. robusta-alba, var. robustapurpurea)
GroupALS inhibitors (B/2)
Herbicidesimazethapyr, nicosulfuron, and primisulfuron-methyl
LocationUnited States, Minnesota
Year1996
Situation(s)Corn (maize), and Soybean
Contributors - (Alphabetically)Jeffrey Gunsolus 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Jeffrey Gunsolus
Nicollett and Blue Earth counties

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GENERAL

Jeffrey Gunsolus
Also resistant to imazethapyr. Greenhouse studies confirmed resistance to Beacon as well.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Giant Green Foxtail biotype with this Giant Green 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 Giant Green 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 Giant Green 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 Giant Green Foxtail Globally
(Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea))
Herbicide Resistant Giant Green Foxtail Globally
(Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea))
Drag a column header and drop it here to group by that column
Herbicide Resistant Giant Green Foxtail Globally
(Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea))
#CountryFirstYearSituationActive IngredientsSite of Action
1 FranceFrance 1982 Corn (maize) atrazine 17 Photosystem II inhibitors (C1/5)
155Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)Giant Green Foxtail471
2 United States (Minnesota) United StatesMinnesota1996 Corn (maize), and Soybean imazethapyr, nicosulfuron, and primisulfuron-methyl 45 ALS inhibitors (B/2)
155Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)Giant Green Foxtail504
3 United States (Minnesota) United StatesMinnesota1999 Soybean fenoxaprop-P-ethyl, and fluazifop-P-butyl 45 ACCase inhibitors (A/1)
155Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)Giant Green Foxtail5167
4 United States (Minnesota) United StatesMinnesota1999 Soybean fenoxaprop-P-ethyl, fluazifop-P-butyl, and sethoxydim 45 ACCase inhibitors (A/1)
155Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)Giant Green Foxtail5168
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, September 20, 2019 .  Available  www.weedscience.org
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