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

International Survey of Herbicide-Resistant Weeds

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Friday, November 1, 2024

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.

QUIK STATS (last updated Sep 15, 2000 )
Common Name	Fringed Willowherb
Species	Epilobium ciliatum
Group	PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicides	simazine
Location	United Kingdom
Year	1981
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.

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Herbicide Resistant Fringed Willowherb Globally
(Epilobium ciliatum)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Belgium

1980

Nurseries, Orchards, and Roadsides

atrazine, and simazine

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

Belgium

1982

Pears

paraquat

PS I Electron Diversion ( HRAC Group 22 (Legacy D)

Poland

1995

Orchards

atrazine

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

United Kingdom

1981

Orchards

simazine

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

United Kingdom

1989

Hops

paraquat

PS I Electron Diversion ( HRAC Group 22 (Legacy D)

Literature about Similar Cases

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Ertli, T. ; Polyánka, H. ; Váradi, G. ; Darkó, É. ; Lehoczki, E.. 1998. Lowered xanthophyll cycle capacity accompanying triazine resistance of weeds. : 2329 - 2332.

The in situ photoinhibition and xanthophyll cycle patterns in atrazine-resistant (R) and susceptible (S) biotypes of Epilobium adenocaulon [E. ciliatum], Senecio vulgaris and Solanum nigrum were studied. The R biotypes had a decreased photosynthetic activity and decreased ratios of fluorescence quenching processes. Measuring the modulated fluorescence parameters revealed that there were no differences between the biotypes in the optimal quantum yield, but there were differences between biotypes in the effective quantum yield, photochemical fluorescence quenching and non-photochemical fluorescence quenching, which were all lower in the R biotypes. The high energy-dependent fluorescent quenching was reduced in all R biotypes also..

Polyánka, H. ; Makrai, L. ; Ertli, T. ; Lehoczki, E.. 1998. Comparison of sensitivity of triazine-resistant and susceptible biotypes of several weeds to UV-B exposure. : 2397 - 2400.

The effects of long-term supplementary UV-B radiation on the function of photosystem II (PS II), the xanthophyll cycle activity and the accumulation of UV-B radiation absorbing compounds in several atrazine resistant (R) and susceptible (S) biotypes of weeds were studied. The plants tested were Epilobium adenocaulon [E. ciliatum], Senecio vulgaris and Solanum nigrum. Photosynthetic functions in R and S biotypes were characterised using chlorophyll fluorescence induction measurements, which showed atrazine resistance caused typical alterations in the functions in the photosynthetic apparatus. Atrazine resistant biotypes were more susceptible to in situ photoinhibition and showed an altered xanthophyll cycle pattern compared with S biotypes. Enhanced UV-B levels did not result in measurable stress effects on the PS II function and xanthophyll cycle activity. It is suggested that there was a direct role of flavonoids in the protection mechanism in the tested plants..

Kutryś, S. ; Ciarka, D. ; Gawron´ski, S. W.. 1998. Utilisation of negative cross-resistance in control of weeds resistant to herbicides. : 39 - 40.

Biotypes of Epilobium adenocaulon [E. ciliatum] and Solanum nigrum resistant (R) and susceptible (S) to atrazine were studied. The postemergence herbicides, bentazone, fluroxypyr and diquat were selected for use in field experiments as they induced the highest negative cross-resistance (NCR) in greenhouse experiments on the basis of 50% growth reduction and index of resistance. Glyphosate was also used. Herbicides were applied at the 4-5 leaf stage. Expression of NCR in the field was estimated on the basis of plant biomass reduction. NCR was observed, but to a lower degree than in greenhouse studies. Resistant biotypes were controlled more effectively by lower herbicide concentrations than S biotypes. Bentazone induced the most NCR in S. nigrum, and fluroxypyr and diquat induced the greatest NCR in E. adenocaulon. It is concluded that NCR may have potential in controlling triazine resistant biotypes under field conditions..

Diaz, M. A. ; Prado, R. de ; Paul, R. N. ; Smeda, R. J.. 1998. Identification of paraquat and atrazine resistance in populations of Epilobium ciliatum. Mededelingen - Faculteit Landbouwkundige en Toegepaste Biologische Wetenschappen, Universiteit Gent 63 : 795 - 797.

Seeds of Epilobium ciliatum were collected from Spanish olive groves. Populations were either susceptible to atrazine and paraquat, or susceptible to atrazine and resistant to paraquat, or resistant to atrazine and paraquat. Leaf bioassays and transmission electron microscopy were carried out. Results showed that no chloroplasts were damaged by paraquat, thus indicating paraquat resistance, while no evidence was found for atrazine resistance..

Gabard, J. ; Thalinger, P. P. ; Nemergut, K. ; Cotterman, J.. 1998. Azafenidin: a new herbicide with applications in perennial crops for the control of herbicide resistant weeds. : 375 - 376.

Greenhouse experiments were conducted to assess the efficacy of pre-em. azafenidin (64-256 g/ha) against biotypes of Kochia scoparia, Abutilon theophrasti, Amaranthus retroflexus, Chenopodium album, Solanum nigrum and Senecio vulgaris (resistant to photosystem II inhibitors), Bidens pilosa, Poa annua and Epilobium ciliatum (resistant to paraquat) and Lolium rigidum, K. scoparia, Salsola iberica, Stellaria media and L. perenne (resistant to acetolactate synthase (ALS) inhibitors). Results indicated that both susceptible and resistant biotypes of all species were successfully controlled by 240 g/ha azafenidin, regardless of whether the resistance was target or metabolism based. Only a fluazifop-P-butyl-resistant L. rigidum biotype was not also susceptible to the 64 or 120 g/ha doses..

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