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Resistance to Malathion in Culex quinquefasciatus Say (Diptera: Culicidae) from Madurai, South India

Published online by Cambridge University Press:  19 September 2011

S. Poopathi ,
N. Arunachalam ,
N. Gopalan ,
G. Baskaran  and
T. R. Mani
S. Poopathi
Affiliation:
Centre for Research in Medical Entomology (Indian Council of Medical Research), 4, Sarojini Street, Chinna Chokkikulam, Madurai – 625 002, Tamil Nadu, South India
N. Arunachalam
Affiliation:
Centre for Research in Medical Entomology (Indian Council of Medical Research), 4, Sarojini Street, Chinna Chokkikulam, Madurai – 625 002, Tamil Nadu, South India
N. Gopalan
Affiliation:
Defence Research Development and Establishment (DRDE) Jhansi Road, Gwalior – 474 002, Madhya Pradesh, North India
G. Baskaran
Affiliation:
Centre for Research in Medical Entomology (Indian Council of Medical Research), 4, Sarojini Street, Chinna Chokkikulam, Madurai – 625 002, Tamil Nadu, South India
T. R. Mani
Affiliation:
Centre for Research in Medical Entomology (Indian Council of Medical Research), 4, Sarojini Street, Chinna Chokkikulam, Madurai – 625 002, Tamil Nadu, South India
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Abstract

—Organophosphorus-derived pesticides are commonly used to control Culex quinquefasciatus, the principal vector of filariasis in India. This paper reports on the susceptibility of C. quinquefasciatus from Madurai city, Tamil Nadu and its environs, to the organophosphate Malathion. It was observed that both larval and adult mosquitoes had low levels of resistance to the pesticide, with resistance ratios at LC50, LC90, and LC95 varying from 0.94 to 3.07 in larvae, and 0.93 to 34.68 in adults. This observation indicates the possibility of higher resistance developing in C. quinquefasciatus populations, the limitation of organophosphorus compounds as larvicides in mosquito breeding sites as a measure to control filariasis, and the importance of research into alternative measures for managing C. quinquefasciatus.

Résumé

Les insecticides dérivés d'organophosphorés sont couramment utilisés pour lutter contre Culex quinquefasciatus, le principal vecteur de la filariose en Inde. Cet article s'intéresse à la sensibilité des C. quinquefasciatus de la ville de Madurai, de Tamil Nadu et de leurs environs, à l'organophosphate Malathion. On constate que les larves et les adultes du moustique ont de faibles niveaux de résistance à l'insecticide, avec des taux de résistance aux DL50, DL90 et DL95 compris entre 0,94 et 3,07 chez les larves et 0,93 et 34,68 chez les adultes. Ce résultat indique la possibilité du développement d'une forte résistance chez les populations de C. quinquefasciatus, la limite d'utilisation des composés organophosphorés pour lutter contre les gîtes larvaires afin de contrôler la filariose et, l'importance de rechercher des méthodes alternatives de lutte pour gérer C. quinquefasciatus.

Keywords

Culex quinquefasciatusbioassaysMalathionresistancefilariasisIndiaCulex quinquefasciatusbioessaisMalathionrésistancefilarioseInde
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 21 , Issue 3 , September 2001 , pp. 251 - 255
Copyright
Copyright © ICIPE 2001

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