International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT GIANT FOXTAIL
(Setaria faberi)


ALS inhibitors (B/2)

Canada, Ontario
INTRODUCTION GIANT FOXTAIL
Giant Foxtail (Setaria faberi) is a monocot weed in the Poaceae family.  In Ontario this weed first evolved resistance to Group B/2 herbicides in 2003 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 Apr 06, 2004 )

Common NameGiant Foxtail
SpeciesSetaria faberi
GroupALS inhibitors (B/2)
Herbicidesimazethapyr
LocationCanada, Ontario
Year2003
Situation(s)Soybean
Contributors - (Alphabetically)Francois Tardif 
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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 Group B/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 B/2 resistant Giant Foxtail from Ontario please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

FRANCOIS TARDIF
Associate Professor
University Of Guelph
Department Of Plant Agriculture
2055 Radatz Ave
Guelph, N1G 2W1, Ontario
Canada
Email Francois Tardif
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Ontario have been instrumental in providing you this information. Particular thanks is given to Francois Tardif 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 ALS inhibitors (B/2)
149Setaria faberiGiant Foxtail5210
2 SpainSpain 1987 Corn (maize) atrazine 38 Photosystem II inhibitors (C1/5)
149Setaria faberiGiant Foxtail184
3 United States (Maryland) United StatesMaryland1984 Corn (maize), and Cropland atrazine 45 Photosystem II inhibitors (C1/5)
149Setaria faberiGiant Foxtail428
4 United States (Wisconsin) United StatesWisconsin1991 Carrots, Corn (maize), Onions, and Sweet corn fluazifop-P-butyl, and sethoxydim 45 ACCase inhibitors (A/1)
149Setaria faberiGiant Foxtail415
5 United States (Iowa) United StatesIowa1992 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
149Setaria faberiGiant Foxtail241
6 United States (Iowa) United StatesIowa1994 Soybean clethodim, fenoxaprop-P-ethyl, fluazifop-P-butyl, quizalofop-P-ethyl, and sethoxydim 45 ACCase inhibitors (A/1)
149Setaria faberiGiant Foxtail1064
7 United States (Minnesota) United StatesMinnesota1996 Corn (maize), and Soybean imazethapyr, nicosulfuron, and primisulfuron-methyl 45 ALS inhibitors (B/2)
149Setaria faberiGiant Foxtail503
8 United States (Illinois) United StatesIllinois1998 Soybean clethodim, and fluazifop-P-butyl 45 ACCase inhibitors (A/1)
149Setaria faberiGiant Foxtail7863
9 United States (Wisconsin) United StatesWisconsin1999 Corn (maize), and Soybean imazethapyr, and nicosulfuron 45 ALS inhibitors (B/2)
149Setaria faberiGiant Foxtail1171
10 United States (Pennsylvania) United StatesPennsylvania2004 Corn (maize) foramsulfuron, imazamox, and nicosulfuron 45 ALS inhibitors (B/2)
149Setaria faberiGiant Foxtail5259
11 United States (Indiana) United StatesIndiana2004 Corn (maize) nicosulfuron, and rimsulfuron 45 ALS inhibitors (B/2)
149Setaria faberiGiant Foxtail5520
12 United States (Michigan) United StatesMichigan2006 Corn (maize), and Soybean foramsulfuron, imazethapyr, and nicosulfuron 45 ALS inhibitors (B/2)
149Setaria faberiGiant Foxtail5290
13 United States (Illinois) United StatesIllinois2007 Corn (maize), and Soybean imazethapyr, and nicosulfuron 45 ALS inhibitors (B/2)
149Setaria faberiGiant Foxtail7862
Literature about Similar Cases

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