<b>HRAC Group 5</b> <font size='2'> (Legacy C1 C2) </font> resistant Epilobium tetragonum from France

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 5 (LEGACY C1 C2) RESISTANT SQUARE-STALKED WILLOWHERB
(Epilobium tetragonum)

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

France

INTRODUCTION		SQUARE-STALKED WILLOWHERB
Square-stalked Willowherb (Epilobium tetragonum) is a dicot weed in the Onagraceae family. In France this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1981 and infests 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	Square-stalked Willowherb
Species	Epilobium tetragonum
Group	PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicides	atrazine
Location	France
Year	1981
Situation(s)	Cropland
Contributors - (Alphabetically)	Jacques Gasquez
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Square-stalked Willowherb biotype with this Square-stalked Willowherb 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 Square-stalked Willowherb 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 Square-stalked Willowherb from France please update the database.

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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.

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Herbicide Resistant Square-stalked Willowherb Globally
(Epilobium tetragonum)

Country

FirstYear

Situation

Active Ingredients

Site of Action

France

1981

Cropland

atrazine

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

Germany

1988

Corn (maize)

atrazine

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

Literature about Similar Cases

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Kees, H.. 1988. The development of triazine-resistant annual weeds in Bavaria and experience with their control. Gesunde Pflanzen 40 : 407 - 412, 414.

The first evidence of weed resistance to triazine herbicides in Bavaria occurred in the period 1975-80 in intensive maize growing areas following continuous treatment with atrazine. Resistance was shown by Stellaria media, Solanum nigrum, Chenopodium album and Galinsoga ciliata, with Atriplex patula and C. ficifolium being largely unaffected. Since 1982 there has been a sharp increase in the areas affected by resistant species which included for the first time Amaranthus retroflexus, Senecio vulgaris and, in isolated instances, C. polyspermum; Polygonum lapathifolium, Fallopia convoluulus, and Epilobium tetragonum also showed resistance. Since 1980, triazine-resistance has also been reported in S. vulgaris, Poa annua, C. album and A. retroflexus in horticultural crops. Control strategies to combat weed resistance are discussed..

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