International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C1/5 RESISTANT MANYSEEDED GOOSEFOOT
(Chenopodium polyspermum)


Photosystem II inhibitors (C1/5)

Switzerland, Vaud
INTRODUCTION MANYSEEDED GOOSEFOOT
Manyseeded Goosefoot (Chenopodium polyspermum) is a dicot weed in the Chenopodiaceae family.  In Switzerland 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 NameManyseeded Goosefoot
SpeciesChenopodium polyspermum
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine
LocationSwitzerland, Vaud
Year1982
Situation(s)Corn (maize)
Contributors - (Alphabetically)Jean Mayor 
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Laboratory trials comparing a known susceptible Manyseeded Goosefoot biotype with this Manyseeded Goosefoot 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 Manyseeded Goosefoot 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 Manyseeded Goosefoot from Switzerland.
 
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CONTRIBUTING WEED SCIENTISTS

JEAN MAYOR
St. Federal De Recherches, Agronomy De Changins
Service De Malherbologie
Weed Mgmt Program Lead - Horticulture
120 Main St, PO Box 400
Nyon, CH-1260
Switzerland

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Switzerland have been instrumental in providing you this information. Particular thanks is given to Jean Mayor for providing detailed information.
Herbicide Resistant Manyseeded Goosefoot Globally
(Chenopodium polyspermum)
Herbicide Resistant Manyseeded Goosefoot Globally
(Chenopodium polyspermum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Manyseeded Goosefoot Globally
(Chenopodium polyspermum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 FranceFrance 1980 Corn (maize), and Cropland atrazine 17 Photosystem II inhibitors (C1/5)
50Chenopodium polyspermumManyseeded Goosefoot459
2 GermanyGermany 1988 Corn (maize) atrazine 18 Photosystem II inhibitors (C1/5)
50Chenopodium polyspermumManyseeded Goosefoot444
3 SwitzerlandSwitzerland 1982 Corn (maize) atrazine 41 Photosystem II inhibitors (C1/5)
50Chenopodium polyspermumManyseeded Goosefoot202
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, September 23, 2019 .  Available  www.weedscience.org
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