INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 5 (LEGACY C1 C2) RESISTANT FRINGED WILLOWHERB
(Epilobium ciliatum)


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

United Kingdom
INTRODUCTION FRINGED WILLOWHERB
Fringed Willowherb (Epilobium ciliatum) is a dicot weed in the Onagraceae family.  In United Kingdom this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1981 and infests Orchards.   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 simazine 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.

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QUIK STATS (last updated Sep 15, 2000 )

Common NameFringed Willowherb
SpeciesEpilobium ciliatum
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicidessimazine
LocationUnited Kingdom
Year1981
Situation(s)Orchards
Contributors - (Alphabetically)Stephen Moss 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Stephen Moss
All of UK

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GENERAL

Stephen Moss
Diuron gives best possible control.

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GENERAL

Stephen Moss
Bailey, J. A., W. G. Richardson, and A. G. Jones (1982). The response of willowherbs (Epilobium adenocaulon and Epilobium obscurum) to pre- or post-emergence herbicides. Proceedings 1982 British Crop Protection Conference - Weeds, 1, 299-305.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Fringed Willowherb biotype with this Fringed 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 Fringed 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 Fringed Willowherb from United Kingdom please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

STEPHEN MOSS
Iacr - Rothamsted
1076 Ag Sci Bldg
PO Box 6108
Harpenden, AL5 2JQ, Hertfordshire
United Kingdom
Email Stephen Moss

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in United Kingdom have been instrumental in providing you this information. Particular thanks is given to Stephen Moss for providing detailed information.
Herbicide Resistant Fringed Willowherb Globally
(Epilobium ciliatum)
Herbicide Resistant Fringed Willowherb Globally
(Epilobium ciliatum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Fringed Willowherb Globally
(Epilobium ciliatum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BelgiumBelgium 1980 Nurseries, Orchards, and Roadsides atrazine, and simazine 3 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
82Epilobium ciliatumFringed Willowherb34
2 BelgiumBelgium 1982 Pears paraquat 3 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
82Epilobium ciliatumFringed Willowherb39
3 PolandPoland 1995 Orchards atrazine 33 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
82Epilobium ciliatumFringed Willowherb375
4 United KingdomUnited Kingdom 1981 Orchards simazine 44 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
82Epilobium ciliatumFringed Willowherb363
5 United KingdomUnited Kingdom 1989 Hops paraquat 44 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
82Epilobium ciliatumFringed Willowherb360
Literature about Similar Cases

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