HRAC GROUP 5 (LEGACY C1 C2) RESISTANT MARSHPEPPER SMARTWEED
(Polygonum hydropiper)

PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

France

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INTRODUCTION MARSHPEPPER SMARTWEED Marshpepper Smartweed (Polygonum hydropiper) is a dicot weed in the Polygonaceae family.  In France this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1989 and infests Corn (maize), and Cropland.   Group 5 (Legacy C1 C2) herbicides are known as PSII inhibitors - Serine 264 Binders (Inhbition of Photosynthesis at PSll - Serine 264 Binders ).  Research has shown that these particular biotypes are resistant to atrazine and they may be cross-resistant to other Group 5 (Legacy C1 C2) 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.

QUIK STATS (last updated Sep 15, 2000 ) Common Name Marshpepper Smartweed Species Polygonum hydropiper Group PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2) Herbicides atrazine Location France Year 1989 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 HRAC Group 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 There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group 5 (Legacy C1 C2) resistant Marshpepper Smartweed from France please update the database.   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) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 France France   1989 Corn (maize), and Cropland atrazine 17 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2) 133 Polygonum hydropiper Marshpepper Smartweed 465

Literature about Similar Cases

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Netland, J.. 1996. Weed species and frequency of simazine-resistant populations of Poa annua and Senecio vulgaris in nursery stocks imported to Norway or inland-raised. : 461 - 468.

A survey was carried out during 1994 in Norway of weeds found in imported or inland-raised nursery stocks, with special emphasis on triazine resistance of Poa annua and Senecio vulgaris. In 45 imported and 52 inland-raised samples, 58 and 45 weed species were found, respectively. Uncommon species in inland nurseries were Chenopodium polyspermum, Chamomilla recutita, Solanum nigrum, Polygonum hydropiper, Eupatorium cannabinum, Catabrosa aquatica, Oxalis corniculata, Alchemilla arvensis, Hydrocotyle vulgaris, Epilobium hirsutum, Ranunculus sceleratus and Apera spica-venti. More species and a greater number of weeds were found in balled plants than in container plants. No difference was recorded in the number of weeds between the imported and inland-raised nursery stocks. Triazine resistance in S. vulgaris was found in 8 out of 8 imported samples, compared to only one sample out of 8 of the inland-raised stocks. The corresponding counts for P. annua were 3 out of 22 and 0 out of 14, respectively..

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