| Abstract: | OBJECTIVE To evaluate the larvicidal activity of Azadirachta indica, Melaleuca
alternifolia, carapa guianensis essential oils and fermented
extract of Carica papaya against Aedes
aegypti (Linnaeus, 1762) (Diptera: Culicidae).METHODS The larvicide test was performed in triplicate with 300 larvae for each
experimental group using the third larval stage, which were exposed for 24h.
The groups were: positive control with industrial larvicide (BTI) in
concentrations of 0.37 ppm (PC1) and 0.06 ppm (PC2); treated with compounds
of essential oils and fermented extract, 50.0% concentration (G1); treated
with compounds of essential oils and fermented extract, 25.0% concentration
(G2); treated with compounds of essential oils and fermented extract, 12.5%
concentration (G3); and negative control group using water (NC1) and using
dimethyl (NC2). The larvae were monitored every 60 min using direct
visualization.RESULTS No mortality occurred in experimental groups NC1 and NC2 in the 24h exposure
period, whereas there was 100% mortality in the PC1 and PC2 groups compared
to NC1 and NC2. Mortality rates of 65.0%, 50.0% and 78.0% were observed in
the groups G1, G2 and G3 respectively, compared with NC1 and NC2.CONCLUSIONS The association between three essential oils from Azadirachta
indica, Melaleuca alternifolia, Carapa guianensis and fermented
extract of Carica papaya was efficient at all
concentrations. Therefore, it can be used in Aedes aegypti
Liverpool third larvae stage control programs. |
