International Survey of Herbicide-Resistant Weeds

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


Photosystem II inhibitors (C1/5)

France
INTRODUCTION MARSHPEPPER SMARTWEED
Marshpepper Smartweed (Polygonum hydropiper) is a dicot weed in the Polygonaceae family.  In France this weed first evolved resistance to Group C1/5 herbicides in 1989 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Sep 15, 2000 )

Common NameMarshpepper Smartweed
SpeciesPolygonum hydropiper
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine
LocationFrance
Year1989
Situation(s)Corn (maize), and Cropland
Contributors - (Alphabetically)Jacques Gasquez 
Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Marshpepper Smartweed biotype with this Marshpepper 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 Marshpepper 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 Marshpepper Smartweed from France.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

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 Marshpepper Smartweed Globally
(Polygonum hydropiper)
Herbicide Resistant Marshpepper Smartweed Globally
(Polygonum hydropiper)
Drag a column header and drop it here to group by that column
Herbicide Resistant Marshpepper Smartweed Globally
(Polygonum hydropiper)
#CountryFirstYearSituationActive IngredientsSite of Action
1 FranceFrance 1989 Corn (maize), and Cropland atrazine 17 Photosystem II inhibitors (C1/5)
133Polygonum hydropiperMarshpepper Smartweed465
Literature about Similar Cases

1
Page size:
select
Page: of 1
Items 1 to 1 of 1

1
Page size:
select
Page: of 1
Items 1 to 1 of 1
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, September 17, 2019 .  Available  www.weedscience.org
Copyright © 1993- 2019 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.