International Survey of Herbicide-Resistant Weeds

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HRAC GROUP 2 (LEGACY B) RESISTANT GIANT FOXTAIL
(Setaria faberi)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United States, Michigan
INTRODUCTION GIANT FOXTAIL
Giant Foxtail (Setaria faberi) is a monocot weed in the Poaceae family.  In Michigan this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2006 and infests Corn (maize), and Soybean.   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 foramsulfuron, imazethapyr, and nicosulfuron 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.

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QUIK STATS (last updated Mar 05, 2007 )

Common NameGiant Foxtail
SpeciesSetaria faberi
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesforamsulfuron, imazethapyr, and nicosulfuron
LocationUnited States, Michigan
Year2006
Situation(s)Corn (maize), and Soybean
Contributors - (Alphabetically)Steven Gower 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Giant Foxtail biotype with this Giant 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 HRAC Group 2 resistant Giant 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 2 (Legacy B) resistant Giant Foxtail from Michigan please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

STEVEN GOWER
Former Weed Science Diagnostician (Now with Monsanto)
Michigan State University
Diagnostic Services
578 Wilson Rd.
East Lansing, 48824, Michigan
United States
Email Steven Gower

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Michigan have been instrumental in providing you this information. Particular thanks is given to Steven Gower for providing detailed information.
Herbicide Resistant Giant Foxtail Globally
(Setaria faberi)
Herbicide Resistant Giant Foxtail Globally
(Setaria faberi)
Drag a column header and drop it here to group by that column
Herbicide Resistant Giant Foxtail Globally
(Setaria faberi)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario2003 Soybean imazethapyr 7 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
149Setaria faberiGiant Foxtail5210
2 SpainSpain 1987 Corn (maize) atrazine 38 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
149Setaria faberiGiant Foxtail184
3 United States (Maryland) United StatesMaryland1984 Corn (maize), and Cropland atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
149Setaria faberiGiant Foxtail428
4 United States (Wisconsin) United StatesWisconsin1991 Carrots, Corn (maize), Onions, and Sweet corn fluazifop-butyl, and sethoxydim 45 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
149Setaria faberiGiant Foxtail415
5 United States (Iowa) United StatesIowa1992 Corn (maize) atrazine 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
149Setaria faberiGiant Foxtail241
6 United States (Iowa) United StatesIowa1994 Soybean clethodim, fenoxaprop-ethyl, fluazifop-butyl, quizalofop-ethyl, and sethoxydim 45 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
149Setaria faberiGiant Foxtail1064
7 United States (Minnesota) United StatesMinnesota1996 Corn (maize), and Soybean imazethapyr, nicosulfuron, and primisulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
149Setaria faberiGiant Foxtail503
8 United States (Illinois) United StatesIllinois1998 Soybean clethodim, and fluazifop-butyl 45 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
149Setaria faberiGiant Foxtail7863
9 United States (Wisconsin) United StatesWisconsin1999 Corn (maize), and Soybean imazethapyr, and nicosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
149Setaria faberiGiant Foxtail1171
10 United States (Pennsylvania) United StatesPennsylvania2004 Corn (maize) foramsulfuron, imazamox, and nicosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
149Setaria faberiGiant Foxtail5259
11 United States (Indiana) United StatesIndiana2004 Corn (maize) nicosulfuron, and rimsulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
149Setaria faberiGiant Foxtail5520
12 United States (Michigan) United StatesMichigan2006 Corn (maize), and Soybean foramsulfuron, imazethapyr, and nicosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
149Setaria faberiGiant Foxtail5290
13 United States (Illinois) United StatesIllinois2007 Corn (maize), and Soybean imazethapyr, and nicosulfuron 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
149Setaria faberiGiant Foxtail7862
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