International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP A/1 RESISTANT GIANT FOXTAIL
(Setaria faberi)


ACCase inhibitors (A/1)

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 A/1 herbicides in 1994 and infests Soybean.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of acetyl CoA carboxylase (ACCase)).  Research has shown that these particular biotypes are resistant to clethodim, fenoxaprop-P-ethyl, fluazifop-P-butyl, quizalofop-P-ethyl, and sethoxydim and they may be cross-resistant to other Group A/1 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 Foxtail
SpeciesSetaria faberi
GroupACCase inhibitors (A/1)
Herbicidesclethodim, fenoxaprop-P-ethyl, fluazifop-P-butyl, quizalofop-P-ethyl, and sethoxydim
LocationUnited States, Iowa
Year1994
Situation(s)Soybean
Contributors - (Alphabetically)Robert Hartzler 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Robert Hartzler
The grower has not noticed it in any other fields but the grower has changed his herbicide rotations and no longer uses sethoxydim. Originally this grower used sethoxydim from 1986 until 1994 and then applied sethoxydim 3 times in 1994, and after poor control he applied clethodim which gave reasonable control. 1995 - BASF did some field work. Kevin Adam began work in 1996 on a masters thesis. Applied up to 16 x in field, did get some suppression but not complete control. Sethoxydim, quizalofop, fluazifop+fenoxaprop were not effective but clethodim was. Nicosulfuron is effective. The grower has stopped using sethoxydim, he uses metolachlor in soybean (follows up patches with clethodim) and metolachlor and nicosulfuron in corn. In a no till system. In 1996 he used Roundup ready technology and again in 1998. Sethoxydim GR50 there was a 48 fold increase, quizalofop 22.5 fold, fluazifop + fenoxaprop 6.5 fold, clethodim 2.1 fold, nicosulfuron 0.5.

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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 A/1 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 A/1 resistant Giant Foxtail from Iowa please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

ROBERT HARTZLER
Extension Weed Specialist and Professor of Agronomy
Iowa State University
Weed Science
2104 Agronomy Hall
Ames, 50011, Iowa
United States
Email Robert Hartzler
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 Robert Hartzler 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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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, August 17, 2017 .  Available  www.weedscience.org
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