International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C1/5 RESISTANT PALE SMARTWEED
(Polygonum lapathifolium)


Photosystem II inhibitors (C1/5)

France
INTRODUCTION PALE SMARTWEED
Pale Smartweed (Polygonum lapathifolium) is a dicot weed in the Polygonaceae family.  In France this weed first evolved resistance to Group C1/5 herbicides in 1979 and infests Corn (maize), and Cropland.   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 NamePale Smartweed
SpeciesPolygonum lapathifolium
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine
LocationFrance
Year1979
Situation(s)Corn (maize), and Cropland
Contributors - (Alphabetically)Jacques Gasquez 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Jacques Gasquez
Email from Jacques Gasquez.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Pale Smartweed biotype with this Pale Smartweed 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 Pale Smartweed 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 Pale Smartweed 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 Pale Smartweed Globally
(Polygonum lapathifolium)
Herbicide Resistant Pale Smartweed Globally
(Polygonum lapathifolium)
Drag a column header and drop it here to group by that column
Herbicide Resistant Pale Smartweed Globally
(Polygonum lapathifolium)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Manitoba) CanadaManitoba2009 Wheat thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
134Polygonum lapathifoliumPale Smartweed5625
2 Canada (Alberta) CanadaAlberta2014 Wheat imazethapyr 7 ALS inhibitors (B/2)
134Polygonum lapathifoliumPale Smartweed11002
3 Czech RepublicCzech Republic 1982 Railways atrazine, cyanazine, lenacil, prometryn, terbuthylazine, and terbutryn 12 Photosystem II inhibitors (C1/5)
134Polygonum lapathifoliumPale Smartweed80
4 FranceFrance 1979 Corn (maize), and Cropland atrazine 17 Photosystem II inhibitors (C1/5)
134Polygonum lapathifoliumPale Smartweed466
5 GermanyGermany 1988 Corn (maize) atrazine 18 Photosystem II inhibitors (C1/5)
134Polygonum lapathifoliumPale Smartweed445
6 SpainSpain 1991 Corn (maize) atrazine 38 Photosystem II inhibitors (C1/5)
134Polygonum lapathifoliumPale Smartweed189
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