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Correlation between the reproductive potential and the pyrethroid resistance in an Indian strain of filarial vector, Culex quinquefasciatus Say (Diptera: Culicidae)

Published online by Cambridge University Press:  23 June 2010

S. Kumar  and
M.K.K. Pillai
S. Kumar*
Affiliation:
Department of Zoology, Acharya Narendra Dev College, University of Delhi, Kalka Ji, New Delhi110 019, India
M.K.K. Pillai
Affiliation:
Department of Zoology, Acharya Narendra Dev College, University of Delhi, Kalka Ji, New Delhi110 019, India
*
*Author for correspondence Fax: +91 11 26475406 E-mail: sarita.sanjay90@gmail.com
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Abstract

The laboratory studies were conducted to uncover the correlation between the levels of pyrethroid resistance and the reproductive potential of parent (SS) and resistant strains of Culex quinquefasciatus (RR) originating from Delhi, India and selected with deltamethrin (RDL) or the combination of deltamethrin and PBO (1:5) (RDP) at the larval stage and selected with deltamethrin at the adult stage (RDA). The reproductive potential was evaluated in terms of fecundity, fertility, egg hatchability and longevity of gonotrophic cycles. The RR strains exhibited 68–74% reduced duration of the gonotrophic cycles when compared with that of SS strain. The considerable decrease in the egg production, ranging from 45.4% to 61.6%, observed in the selected strains as compared to the SS strain, indicates the possible positive correlation between the levels of deltamethrin resistance and the reproduction disadvantage. This correlation was further confirmed by 24.6% to 53.6% decrease in the hatchability of eggs of the selected strains with respect to that of the parent strain. A worth-mentioning observation of the reduced reproductive fitness in RDP strains suggests the effectiveness of synergized deltamethrin selections in reducing the frequency of resistant individuals. The reproductive disadvantage in adult-selected strains possessing negligible resistance to deltamethrin implicates the efficacy of deltamethrin as an adulticide rather than as a larvicide against Cx. quinquefasciatus. The results suggest that the reduced reproductive fitness of resistant genotypes in the population can eliminate heterozygotes and resistant homozygotes by implementing different resistance-management strategies against Cx. quinquefasciatus.

Keywords

Culex quinquefasciatusdeltamethrin resistancereproductive potentialfecundityegg hatchabilityfitnessgonotrophic cycle
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 101 , Issue 1 , February 2011 , pp. 25 - 31
Copyright
Copyright © Cambridge University Press 2010

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