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Impact of water renewal on the residual effect of larvicides in the control of Aedes aegypti

2010; Instituto Oswaldo Cruz, Ministério da Saúde; Volume: 105; Issue: 2 Linguagem: Inglês

10.1590/s0074-02762010000200019

1678-8060

Ricardo José Soares Pontes, Fábio Fernandes Dantas Filho, Carlos Henrique Alencar, Ana Cláudia Ferreira Regazzi, Luciano Pamplona de Góes Cavalcanti, Alberto Novaes Ramos, José Wellington de Oliveira Lima,

Mosquito-borne diseases and control

This study was carried out to evaluate the residual effect of three larvicides under laboratory conditions for 100 days in Aedes aegypti. The larval mortality rate was measured without water renewal or with daily water renewal (80%). With temephos, there was 100% mortality in both groups until the 70th day. In the Bacillus thuringiensis israelensis (Bti)-WDG test, there was no difference during the first 20 days. With Bti-G, without water renewal, mortality was sustained above 90% for up to 35 days. The second experiment (with water renewal) reduced the mortality to below 90% after the first 20 days. When renewed water was provided, the residual effect was significantly lower for all larvicides.