title: First report on susceptibility of wild Aedes aegypti (Diptera: Culicidae) using Carapa guianensis (Meliaceae) and Copaifera sp. (Leguminosae).
abstract: Oils of Carapa guianensis and Copaifera spp. are well known in the Amazonian region as natural insect repellent, and studies have reported their efficiency as larvicide against some laboratory mosquito species. However, in wild populations of mosquitoes, these oils have not yet been evaluated. Thus, the objective of this study was to investigate their efficiency as larvicide in wild populations of Aedes aegypti with a history of exposure to organophosphate. The susceptibility of larvae was determined under three different temperatures, 15°C, 20°C, and 30°C. For each test, 1,000 larvae were used (late third instar and early fourth instar-four replicates of 25 larvae per concentration). Statistical tests were used to identify significant differences. The results demonstrated that as the laboratory A. aegypti, the wild populations of A. aegypti were also susceptible to C. guianensis and Copaifera sp. oils. The lethal concentrations for Copaifera sp. ranged from LC(50) 47 to LC(90) 91 (milligrams per liter), and for C. guianensis, they were LC(50) 136 to LC(90) 551 (milligrams per liter). In relation to different temperature, the effectiveness of the oils on larvae mortality was directly related to the increase of temperature, and better results were observed for temperature at 25°C. The results presented here indicate the potential larvicidal activity of C. guianensis and species of Copaifera, in populations of A. aegypti from the wild. Therefore, the results presented here are very important since such populations are primarily responsible for transmitting the dengue virus in the environment.
authors.affiliation: Setor de Ciências Biológicas, Departamento de Zoologia, Programa de Pós-graduação em Entomologia, Universidade Federal do Paraná, Caixa Postal 19020, CEP: 81531-980 Curitiba, PR, Brazil. jprophiro@yahoo.com.br
authors.forename: Josiane S
authors.initials: JS
authors.lastname: Prophiro
authors.forename: Mario Antonio Navarro
authors.initials: MA
authors.lastname: da Silva
authors.forename: Luiz A
authors.initials: LA
authors.lastname: Kanis
authors.forename: Louyse Caroline B P
authors.initials: LC
authors.lastname: da Rocha
authors.forename: Jonny E
authors.initials: JE
authors.lastname: Duque-Luna
authors.forename: Onilda S
authors.initials: OS
authors.lastname: da Silva
mesh_terms: D000330:Aedes / Q000187:drug effects*; D000818:Animals; D007887:Fabaceae / Q000737:chemistry*; D007306:Insecticides / Q000302:isolation & purification / Q000494:pharmacology*; D007814:Larva / Q000187:drug effects; D029582:Meliaceae / Q000737:chemistry*; D010938:Plant Oils / Q000302:isolation & purification / Q000494:pharmacology*; D016019:Survival Analysis; D013696:Temperature
chemical_list: D007306:Insecticides; D010938:Plant Oils