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.
Assuntos
Aedes/efeitos dos fármacos , Fenitrotion/farmacologia , Inseticidas/farmacologia , Temefós/farmacologia , Aedes/enzimologia , Animais , Bioensaio , Brasil , Dengue/prevenção & controle , Esterases/metabolismo , Resistência a Inseticidas , Larva/efeitos dos fármacos , Larva/enzimologia , Controle de MosquitosRESUMO
Since the reintroduction of Aedes aegypti in the state of Säo 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
Assuntos
Animais , Temefós , Aedes , Inseticidas Organofosforados , Fenitrotion , Bioensaio , Brasil , Resistência a Inseticidas , Controle de Mosquitos , Aedes , Dengue , Esterases , LarvaRESUMO
Foi detectada, por meio de bioensaios, alteraçäo dos níveis de suscetibilidade do Aedes aegypti a organofosforados em municípios do Estado de Säo Paulo