International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C1/5 RESISTANT GIANT FOXTAIL
(Setaria faberi)


Photosystem II inhibitors (C1/5)

United States, Iowa
INTRODUCTION GIANT FOXTAIL
Giant Foxtail (Setaria faberi) is a monocot weed in the Poaceae family.  In Iowa this weed first evolved resistance to Group C1/5 herbicides in 1992 and infests Corn (maize).   Group C1/5 herbicides are known as Photosystem II inhibitors (Inhibition of photosynthesis at photosystem II).  Research has shown that these particular biotypes are resistant to atrazine and they may be cross-resistant to other Group C1/5 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 NameGiant Foxtail
SpeciesSetaria faberi
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine
LocationUnited States, Iowa
Year1992
Situation(s)Corn (maize)
Contributors - (Alphabetically)Jack Dekker (Retired), and Micheal Owen 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Jack Dekker (Retired)
Central Iowa

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Laboratory 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 C1/5 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

Triazine resistant weeds often exhibit a lower relative fitness when compared to susceptible biotypes.  The most common mutation conferring triazine resistance (Ser 264 to Gly mutation of the psbA gene) also causes a reduction in CO2 fixation, quantum yield, and seed and biomass production.  There is no record in this database referring specifically to fitness studies on Group C1/5 resistant Giant Foxtail from Iowa.
 
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CONTRIBUTING WEED SCIENTISTS

JACK DEKKER (RETIRED)
Iowa State University
Agronomy Dept.
6394 Grandview Road
Ames, 50011, Iowa
United States
Email Jack Dekker (Retired)
MICHEAL OWEN
Associate Chair And Professor
Iowa State University
Agronomy Department
3218 Agronomy Hall
Ames, 50011, Iowa
United States
Email Micheal Owen
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Iowa have been instrumental in providing you this information. Particular thanks is given to Jack Dekker (Retired), and Micheal Owen 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
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