Resistance of Aedes aegypti from the state of São Paulo, Brazil, to organophosphates insecticides

Memórias do Instituto Oswaldo Cruz

Maria De Lourdes G Macoris²  Maria Teresa M Andrighetti²  Luiz Takaku²  Carmen M Glasser¹  Vanessa C Garbeloto²  José Eduardo Bracco¹ 

[1] ,Sucen Serviço Regional Núcleo de PesquisaMarília SP ,Brasil

关键词: Aedes aegypti;    insecticide;    resistance;    control;    bioassay;    organophosphate;    esterase;   

DOI  :  10.1590/S0074-02762003000500020

来源: SciELO

【 摘 要 】

Since the reintroduction of Aedes aegypti in the state of São Paulo, in the middle of the 1980-decade, organophosphate insecticides are being used to control the dengue vector. In 1996, an annual program for monitoring the susceptibility of Ae. aegypti to the insecticides was implemented. Some of the results of this monitoring program are presented. Ae. aegypti populations from ten localities have been submitted to bioassays with the diagnostic dose of temephos and fenitrothion. Only two (Marília and Presidente Prudente) remain susceptible to both insecticides and one (Santos) exhibits true resistance. Ae. aegypti from the remaining localities showed an incipient altered susceptibility. Resistance ratios varied from 1.2 to 2.9 for temephos and from 1.5 to 3.2 to fenitrothion, indicating moderate levels of resistance. Biochemical assays did not detect alterations in the enzyme acetilcholinesterase, but indicated that resistance is associated with esterases.

【 授权许可】

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