International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C1/5 RESISTANT GIANT GREEN FOXTAIL
(Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea))


Photosystem II inhibitors (C1/5)

France
INTRODUCTION GIANT GREEN FOXTAIL
Giant Green Foxtail (Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)) is a monocot weed in the Poaceae family.  In France this weed first evolved resistance to Group C1/5 herbicides in 1982 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 Green Foxtail
SpeciesSetaria viridis var. major (=var. robusta-alba, var. robustapurpurea)
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine
LocationFrance
Year1982
Situation(s)Corn (maize)
Contributors - (Alphabetically)Jacques Gasquez 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Jacques Gasquez
Homer LeBaron. 1991. Distribution and Seriousness of Herbicide-Resistant Weed Infestations Worldwide. In: Herbicide Resistance in Weeds and Crops.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Giant Green Foxtail biotype with this Giant 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 Giant 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

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 Green Foxtail from France.
 
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CONTRIBUTING WEED SCIENTISTS

JACQUES GASQUEZ
Inra
Laboratoire De Malherbologie
702 Hickory Ct
Dijon, 21034, Cedex
France
Email Jacques Gasquez

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in France have been instrumental in providing you this information. Particular thanks is given to Jacques Gasquez for providing detailed information.
Herbicide Resistant Giant Green Foxtail Globally
(Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea))
Herbicide Resistant Giant Green Foxtail Globally
(Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea))
Drag a column header and drop it here to group by that column
Herbicide Resistant Giant Green Foxtail Globally
(Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea))
#CountryFirstYearSituationActive IngredientsSite of Action
1 FranceFrance 1982 Corn (maize) atrazine 17 Photosystem II inhibitors (C1/5)
155Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)Giant Green Foxtail471
2 United States (Minnesota) United StatesMinnesota1996 Corn (maize), and Soybean imazethapyr, nicosulfuron, and primisulfuron-methyl 45 ALS inhibitors (B/2)
155Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)Giant Green Foxtail504
3 United States (Minnesota) United StatesMinnesota1999 Soybean fenoxaprop-P-ethyl, and fluazifop-P-butyl 45 ACCase inhibitors (A/1)
155Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)Giant Green Foxtail5167
4 United States (Minnesota) United StatesMinnesota1999 Soybean fenoxaprop-P-ethyl, fluazifop-P-butyl, and sethoxydim 45 ACCase inhibitors (A/1)
155Setaria viridis var. major (=var. robusta-alba, var. robustapurpurea)Giant Green Foxtail5168
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, October 16, 2019 .  Available  www.weedscience.org
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