Atividade larvicida do extrato bruto de Swinglea glutinosa evidenciada pelas alterações morfohistológicas em larvas de Aedes aegypti (Diptera, Culicidae)

• Autor(a) principal: Cabral, Sávio da Silva
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/4971
• topic: Aedes aegypti; Swinglea glutinosa; Morfohistológicos; Aedes aegypti; Swinglea glutinosa; Morphohistological; BIOLOGIA E FISIOLOGIA DOS MICROORGANISMOS::BACTEROLOGIA

Aedes aegypti is the major vector of dengue, urban yellow fever and emerging arboviruses in Brazil, as chikungunya fever. This mosquito is adapted to the urban environment, and is an important factor for the maintenance of its kind, the long period of quiescence of eggs, which was an extraordinary physiological adaptation to different climatic and dietary factors. Approximately 2.5 billion people live in endemic, exposed to dengue transmission countries. The best solution would be to control multivalent vaccines to existing serotypes. Tetravalent vaccines are being tested in several countries, including Brazil. However, recently it described a fifth serotype, and this can probably extend the course of research. So how vaccines are not ready for use, dengue control has been done by the intervention of actions against the vector, Ae. aegypti. Among the actions, the use of synthetic chemical insecticides has been the main, it emerged mosquito susceptibility of modification in many Brazilian cities and later confirmation of resistance status. This paper proposes the search for alternatives, through prospecting of natural compounds insecticides for the control of Ae. aegypti. Among the actions, the use of synthetic chemical insecticides has been the main. However, with the continuous use of the same product in some brazilians municipalities seemed evidence of mosquito susceptibility modification and subsequently confirm the resistance status. Among, measures control alternatives Ae. aegypti is prospecting for natural compounds insecticides. This work proposes the study of crude ethanol extract (c.e.e.) the result of Swinglea glutinous as larvicide and it showed CL50 and CL90 of 74.4 ppm to 125.2 ppm for third instar larvae of Ae. aegypti, besides the toxicity effect on these intestinal cells larvae investigated by morphohistological study. The morphological changes that are intensified with increasing time of exposure to the larvae of c.e.e. were visualized particularly in the posterior region of the midgut, included folding of the peritrophic matrix, increasing subperitrophic space, cytoplasmic vacuolization, reduction of the microvilli cells. What characterized and checked the larvicidal effect of c.e.e. demonstrating its potential use for controlling Ae. aegypti.