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Sensitivity of Culicoides obsoletus (Meigen) (Diptera: Ceratopogonidae) to deltamethrin determined by an adapted WHO standard susceptibility test

Published online by Cambridge University Press:  26 November 2013

R. DEL RÍO*
Affiliation:
Laboratory of Zoology, University of the Balearic Islands (UIB), Palma de Mallorca, Spain
R. VENAIL
Affiliation:
Entente Interdépartementale pour la Démoustication du littoral méditerranéen (EID Méditerranée), Montpellier, France
C. CALVETE
Affiliation:
Unit of Animal Health and Production, Centre for Agricultural Food Technology and Research [Centro de Investigación y Tecnología Agroalimentaria (CITA)], Zaragoza, Spain
C. BARCELÓ
Affiliation:
Laboratory of Zoology, University of the Balearic Islands (UIB), Palma de Mallorca, Spain
T. BALDET
Affiliation:
Centre International de Recherche de l'Agriculture et du Dévéloppement (CIRAD), Montpellier, France
J. LUCIENTES
Affiliation:
Department of Animal Pathology, University of Zaragoza (UZ). Faculty of Veterinary Science, Zaragoza, Spain
M. A. MIRANDA
Affiliation:
Laboratory of Zoology, University of the Balearic Islands (UIB), Palma de Mallorca, Spain
*
* Corresponding author: Laboratory of Zoology, University of the Balearic Islands, Cra/Valldemossa Km 7·5, Palma de Mallorca, Spain. E-mail: [email protected]

Summary

Bluetongue is a disease of major economic concern in Europe. Its causative agent, bluetongue virus (BTV), is transmitted by several Culicoides species (mainly Culicoides imicola and Culicoides obsoletus in Europe). The application of insecticides on animals may reduce transmission of BTV, however, no formulation is currently licensed specifically against Culicoides midges. The present study assesses the susceptibility of C. obsoletus to deltamethrin using an adapted World Health Organization (WHO) susceptibility test. Midges were exposed to different dosages of deltamethrin for 1 h, and mortality after 1 h and 24 h was recorded. Results indicated that deltamethrin is highly toxic to C. obsoletus since a dose of 1·33×10−4% was enough to kill 50% of the population (LD50) in 24 h. The deltamethrin concentration needed to kill 90% of the population (LD90) was 5·55×10−4%. The results obtained in the present work could help to create a system that can be used to assess insecticide resistance and susceptibility of Culicoides biting midges.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2013 

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