Resistance of Aedes aegypti to temephos and adaptive disadvantages

Authors

  • Morgana Michele Cavalcanti de Souza Leal Diniz Universidade de São Paulo; Faculdade de Saúde Pública
  • Alleksandra Dias da Silva Henriques Universidade Estadual da Paraíba; Departamento de Biologia
  • Renata da Silva Leandro Universidade Estadual da Paraíba; Departamento de Biologia
  • Dalvanice Leal Aguiar Universidade Estadual da Paraíba; Departamento de Biologia
  • Eduardo Barbosa Beserra Universidade Estadual da Paraíba; Departamento de Biologia

DOI:

https://doi.org/10.1590/S0034-8910.2014048004649

Abstract

OBJECTIVE To evaluate the resistance of Aedes aegypti to temephos Fersol 1G (temephos 1% w/w) associated with the adaptive disadvantage of insect populations in the absence of selection pressure. METHODS A diagnostic dose of 0.28 mg a.i./L and doses between 0.28 mg a.i./L and 1.40 mg a.i./L were used. Vector populations collected between 2007 and 2008 in the city of Campina Grande, state of Paraíba, were evaluated. To evaluate competition in the absence of selection pressure, insect populations with initial frequencies of 20.0%, 40.0%, 60.0%, and 80.0% resistant individuals were produced and subjected to the diagnostic dose for two months. Evaluation of the development of aquatic and adult stages allowed comparison of the life cycles in susceptible and resistant populations and construction of fertility life tables. RESULTS No mortality was observed in Ae. aegypti populations subjected to the diagnostic dose of 0.28 mg a.i./L. The decreased mortality observed in populations containing 20.0%, 40.0%, 60.0%, and 80.0% resistant insects indicates that temephos resistance is unstable in the absence of selection pressure. A comparison of the life cycles indicated differences in the duration and viability of the larval phase, but no differences were observed in embryo development, sex ratio, adult longevity, and number of eggs per female. CONCLUSIONS The fertility life table results indicated that some populations had reproductive disadvantages compared with the susceptible population in the absence of selection pressure, indicating the presence of a fitness cost in populations resistant to temephos.

Published

2014-10-01

How to Cite

Diniz, M. M. C. de S. L., Henriques, A. D. da S., Leandro, R. da S., Aguiar, D. L., & Beserra, E. B. (2014). Resistance of Aedes aegypti to temephos and adaptive disadvantages . Revista De Saúde Pública, 48(5), 775-782. https://doi.org/10.1590/S0034-8910.2014048004649

Issue

Section

Original Articles