International Survey of Herbicide-Resistant Weeds

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


Photosystem II inhibitors (C1/5)

Spain
INTRODUCTION GREEN FOXTAIL
Green Foxtail (Setaria viridis) is a monocot weed in the Poaceae family.  In Spain this weed first evolved resistance to Group C1/5 herbicides in 1987 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 Nov 20, 2000 )

Common NameGreen Foxtail
SpeciesSetaria viridis
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine
LocationSpain
Year1987
Situation(s)Corn (maize)
Contributors - (Alphabetically)Rafael De Prado 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Rafael De Prado
Palma Der Rio, Almodovar Del Rio (Cordoba)

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GENERAL

Rafael De Prado
Target site resistance.

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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Green Foxtail biotype with this 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 C1/5 resistant 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

Studies on the mechanism of resistance of Group C1/5 resistant Green Foxtail from Spain indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Green Foxtail from Spain.
 
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CONTRIBUTING WEED SCIENTISTS

RAFAEL DE PRADO
Universidad De Cordoba
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
PO Box 119
Cordoba, E-14080, Andalusia
Spain
Email Rafael De Prado

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Spain have been instrumental in providing you this information. Particular thanks is given to Rafael De Prado for providing detailed information.
Herbicide Resistant Green Foxtail Globally
(Setaria viridis)
Herbicide Resistant Green Foxtail Globally
(Setaria viridis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Green Foxtail Globally
(Setaria viridis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Manitoba) CanadaManitoba1988 Canola, Cropland, Spring Barley, and Wheat ethalfluralin, and trifluralin 7 Microtubule inhibitors (K1/3)
153Setaria viridisGreen Foxtail52
2 Canada (Alberta) CanadaAlberta1989 Canola, Peas, Spring Barley, and Wheat ethalfluralin, and trifluralin 7 Microtubule inhibitors (K1/3)
153Setaria viridisGreen Foxtail5071
3 Canada (Manitoba) CanadaManitoba1991 Canola, Cropland, Spring Barley, and Wheat diclofop-methyl, fenoxaprop-P-ethyl, sethoxydim, and tralkoxydim 7 ACCase inhibitors (A/1)
153Setaria viridisGreen Foxtail53
4 Canada (Saskatchewan) CanadaSaskatchewan1991 Canola, Flax, Spring Barley, and Wheat ethalfluralin, and trifluralin 7 Microtubule inhibitors (K1/3)
153Setaria viridisGreen Foxtail5040
5 Canada (Manitoba) CanadaManitoba1992 Canola, Flax, Spring Barley, and Wheat diclofop-methyl, ethalfluralin, fenoxaprop-P-ethyl, sethoxydim, tralkoxydim, and trifluralin 7 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
Microtubule inhibitors (K1/3)
153Setaria viridisGreen Foxtail5037
6 Canada (Saskatchewan) CanadaSaskatchewan1996 Canola, Cropland, Spring Barley, and Wheat fenoxaprop-P-ethyl, and sethoxydim 7 ACCase inhibitors (A/1)
153Setaria viridisGreen Foxtail5038
7 Canada (Alberta) CanadaAlberta1996 Wheat diclofop-methyl, fenoxaprop-P-ethyl, and sethoxydim 7 ACCase inhibitors (A/1)
153Setaria viridisGreen Foxtail5039
8 Canada (Saskatchewan) CanadaSaskatchewan1996 Canola, Peas, Spring Barley, and Wheat fenoxaprop-P-ethyl, and trifluralin 7 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
Microtubule inhibitors (K1/3)
153Setaria viridisGreen Foxtail5070
9 Canada (Ontario) CanadaOntario2001 Corn (maize), and Soybean flucarbazone-sodium, imazethapyr, nicosulfuron, and pyrithiobac-sodium 7 ALS inhibitors (B/2)
153Setaria viridisGreen Foxtail5124
10 Canada (Manitoba) CanadaManitoba2002 Wheat imazethapyr, and sulfosulfuron 7 ALS inhibitors (B/2)
153Setaria viridisGreen Foxtail5221
11 FranceFrance 1982 Corn (maize) atrazine 17 Photosystem II inhibitors (C1/5)
153Setaria viridisGreen Foxtail470
12 FranceFrance 2011 Corn (maize) foramsulfuron, and nicosulfuron 17 ALS inhibitors (B/2)
153Setaria viridisGreen Foxtail9933
13 SpainSpain 1987 Corn (maize) atrazine 38 Photosystem II inhibitors (C1/5)
153Setaria viridisGreen Foxtail178
14 United States (North Dakota) United StatesNorth Dakota1989 Sunflower, and Wheat trifluralin 45 Microtubule inhibitors (K1/3)
153Setaria viridisGreen Foxtail493
15 United States (Wisconsin) United StatesWisconsin1999 Corn (maize), and Soybean imazamox 45 ALS inhibitors (B/2)
153Setaria viridisGreen Foxtail1172
16 United States (Montana) United StatesMontana2005 Canola, Peas, Spring Barley, and Wheat diclofop-methyl, fenoxaprop-P-ethyl, fluazifop-P-butyl, pinoxaden, and sethoxydim 45 ACCase inhibitors (A/1)
153Setaria viridisGreen Foxtail7804
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