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Abstracts - Gabriel Faierstein

EVALUATION OF AEDES AEGYPTI LARVAL WATER AS OVIPOSITION LURE UNDER FIELD CONDITIONS

Gabriel Faierstein1; Vinícius Souza1; Walter S. Leal2; Rosângela Barbosa1*

1 Instituto Aggeu Magalhães, Fundação Oswaldo Cruz; g.faierstein@hotmail.com; viniciuseduardosouza2@gmail.com; barbosar@cpqam.fiocruz.br

2 University of California-Davis; wsleal@ucdavis.edu

*Correspondence: barbosar@cpqam.fiocruz.br

There is a consensus in the literature that larval- and pupal-holding water are active in eliciting oviposition in conspecific adult mosquitoes, although some apparently contradicting results may be derived from confounding factors, such as, visual stimuli and overcrowding factors. If proven effective in the field, these natural “extracts” might be useful in surveillance and/or control strategies. After all, gravid traps are the most effective tool for surveillance as they target a critical epidemiological stage, i.e., the gravid female that are more likely to be infected with a vector-borne pathogen. Here, we tested the potential use of this strategy against the yellow fever mosquito, Aedes aegypti. Six groups of paired ovitraps (test and control) were installed in the external facilities of the Instituto Aggeu Magalhães (Recife, Brazil). To prevent the traps from becoming breeding sites, biological larvicide (Bti) was added to test and control traps. The assays were run in triplicate and each run lasted for 15 days. At the end of each experiment, the wooden paddles were changed and new treatment with Bti was added. The results showed that under field conditions gravid females of Ae. aegypti laid significantly more eggs in treatment than in control ovitraps. We, therefore, concluded that field populations of Ae. aegypti can be stimulated to lay more eggs in previously colonized breeding sites and that this strategy has a potential application for surveillance and possibly attraction-and-kill.

Keywords: Aedes aegypti, oviposition, vector control.