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Effects of sublethal concentrations of diflubenzuron and methoprene on Aedes aegypti (Diptera: Culicidae) fitness

Published online by Cambridge University Press:  01 March 2009

Juliana Junqueira da Silva ,
Julio Mendes  and
Cecília Lomônaco
Juliana Junqueira da Silva
Affiliation:
Instituto de Ciências Biomédicas, Programa de Pós-Graduação em Imunologia e Parasitologia Aplicadas, Uberlândia, MG, Brazil
Julio Mendes
Affiliation:
Instituto de Ciências Biomédicas, Programa de Pós-Graduação em Imunologia e Parasitologia Aplicadas, Uberlândia, MG, Brazil
Cecília Lomônaco*
Affiliation:
Instituto de Biologia, Universidade Federal de Uberlândia, Uberlândia38.400-902, Minas Gerais, Brazil
*
*E-mail: [email protected]
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Abstract

The effects of sublethal concentrations of the insect growth regulators (IGRs) diflubenzuron and methoprene on some fitness components of an Aedes aegypti (L.) population in south-eastern Brazil were investigated. The fourth instar larvae of the mosquito were exposed to 20 ppb methoprene and 3 ppb diflubenzuron, and adult survivors were evaluated for fitness parameters, including body size and biomass, fecundity, fertility, longevity and symmetry. The sublethal concentrations had negative effects on longevity, but biomass, fecundity and fertility were not affected by either IGR. In separate experiments, A. aegypti individuals' surviving concentrations of 2, 3 and 3.5 ppb diflubenzuron and 5, 10 and 20 ppb methoprene were used for morphological analyses (size and symmetry). Diflubenzuron had negative effects on the mosquito's body symmetry. The observed decreases in longevity and symmetry may have negative impacts on the population dynamics of A. aegypti.

Keywords

Aedes aegyptidiflubenzuronmethopreneinsect growth regulatorfluctuating asymmetrysouth-eastern Brazil
Type
Research Paper
Information
International Journal of Tropical Insect Science , Volume 29 , Issue 1 , March 2009 , pp. 17 - 23
Copyright
Copyright © ICIPE 2009

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