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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 98, No. 5, 2003, pp. 703-708
Bioline Code: oc03144
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 98, No. 5, 2003, pp. 703-708

 en Resistance of Aedes aegypti check for this species in other resources from the State of São Paulo, Brazil, to Organophosphates Insecticides
Maria de Lourdes G Macoris; Maria Teresa M Andrighetti; Luiz Takaku; Carmen M Glasser; Vanessa C Garbeloto & José Eduardo Bracco

Abstract

Since the reintroduction of Aedes aegypti check for this species in other resources 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.

Keywords
Aedes aegypti check for this species in other resources - insecticide - resistance - control - bioassay - organophosphate - esterase

 
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