Avaliação da atividade larvicida de sais imidazólicos sobre Aedes albopictus (Skuse, 1894) (Diptera: Culicidae)

• Autor(a) principal: Gonçalves, Douglas Zelinger
• Data de Publicação: 2019
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Universitário da Ânima (RUNA)
• Texto Completo: https://repositorio.animaeducacao.com.br/handle/ANIMA/12512
• topic: Aedes albopictus; Sais imidazólicos; Larvicida

The Aedes albopictus (Skuse, 1894) mosquito is considered a vector of medical importance because it has vector capacity in the laboratory for 22 arboviruses, including dengue, chikungunya and yellow fever viruses. The present study aimed to evaluate the larvicidal activity of the imidazolium salts (IS) C16MImMeS and C18MImCl against A. Albopictus larvae. For this, larvae of Ae. albopictus of 3rd final instar and/or 4th initial instar were exposed to 11 different concentrations (ranging from 0.5ppm to 10ppm) of C16MImMeS and C18MImCl. The bioassay was performed in triplicate, containing 20 larvae in each replicate and using purified water as control. It was conducted at a temperature of 25°C with a relative humidity of 80% (± 10%) in a climate chamber. Larval mortality was evaluated at 24 and 48 hours of exposure of the larvae to the solutions, being considered dead larvae that did not move when touched. For the results analysis, the variance test (ANOVA) was performed, with significant values of p≤0.05. Lethal concentrations, those that caused 50% mortality (LC50) were calculated by the Probit program. The IS C16MImMeS and C18MImCl showed larvicidal activity against A. albopictus at 24 and 48h exposure. At the lowest concentration (0.5ppm) of C16MImMeS and C18MImCl, mortality was 6.6 and 23.3%, at the highest concentration (10ppm) mortality was 85 and 100%, respectively. The 50% lethal concentrations (LC50) of IS C16MImMeS and C18MImCl at 48h exposure were 2.35ppm and 3.61ppm, respectively. Imidazolium salts C16MImMeS and C18MImCl have larvicidal potential against A. albopictus, being the first study to demonstrate the use of these IS to control A. albopictus. Further studies are necessary to understand its behavior in pupae and mosquito adulthood, its mechanism of action, and possible resistance factors.