Autor(es): Macoris Maria de Lourdes G,Andrighetti Maria Teresa M,Takaku Luiz,Glasser Carmen M,Garbeloto Vanessa C,Bracco José Eduardo

Resumo: Since the reintroduction of Aedes aegypti in the state of S o 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 (Mar lia 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.

Palavras-Chave: Aedes aegypti; Insecticide; Resistance; Control; Bioassay; Organophosphate; Esterase

Imprenta: Memo?rias do Instituto Oswaldo Cruz, v. 98, n. 5, p. 703-708, 2003

Identificador do objeto digital: 10.1590/S0074-02762003000500020

Descritores: Aedes aegypti - Viral infections ; Aedes aegypti - Dengue ; Aedes aegypti - Public health

Data de publicação: 2003