International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C1/5 RESISTANT YELLOW FOXTAIL
(Setaria pumila (=S. glauca))


Photosystem II inhibitors (C1/5)

Spain
INTRODUCTION YELLOW FOXTAIL
Yellow Foxtail (Setaria pumila (=S. glauca)) 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 NameYellow Foxtail
SpeciesSetaria pumila (=S. glauca)
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 Del Rio, Almodovar Del Rio (Cordoba)

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GENERAL

Rafael De Prado
Target Site Mechanism of Resistance.

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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Yellow Foxtail biotype with this Yellow 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 Yellow 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 Yellow 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 Yellow 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 Yellow Foxtail Globally
(Setaria pumila (=S. glauca))
Herbicide Resistant Yellow Foxtail Globally
(Setaria pumila (=S. glauca))
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Herbicide Resistant Yellow Foxtail Globally
(Setaria pumila (=S. glauca))
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario1981 Corn (maize), and Cropland atrazine 7 Photosystem II inhibitors (C1/5)
150Setaria pumila (=S. glauca)Yellow Foxtail64
2 FranceFrance 1981 Corn (maize) atrazine 17 Photosystem II inhibitors (C1/5)
150Setaria pumila (=S. glauca)Yellow Foxtail469
3 SpainSpain 1987 Corn (maize) atrazine 38 Photosystem II inhibitors (C1/5)
150Setaria pumila (=S. glauca)Yellow Foxtail179
4 United States (Maryland) United StatesMaryland1984 Corn (maize), and Cropland atrazine, cyanazine, and simazine 45 Photosystem II inhibitors (C1/5)
150Setaria pumila (=S. glauca)Yellow Foxtail427
5 United States (Minnesota) United StatesMinnesota1997 Soybean imazethapyr 45 ALS inhibitors (B/2)
150Setaria pumila (=S. glauca)Yellow Foxtail506
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, September 17, 2019 .  Available  www.weedscience.org
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