Atividade larvicida dos óleos essenciais de Syzygium aromaticum e Citrus sinensis em populações de Aedes aegypti
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Data
2014-07-28
Autores
Araujo, Adriana Faraco de Oliveira [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A dengue, doença infecciosa aguda, causada por um vírus da família Flaviviridae e transmitida aos humanos pela picada dos mosquitos do gênero Aedes, é considerada um dos principais problemas de saúde pública no mundo. O Aedes aegypti é o único vetor conhecido nas Américas e no Brasil está presente nos 26 estados e no distrito federal. A indisponibilidade de uma vacina que imunize a população contra os quatro sorotipos da dengue restringe a prevenção da doença ao controle do vetor. Isto é feito por aplicações de inseticidas químicos, porém o uso frequente em altas doses tem selecionado populações resistentes do mosquito. Diante dessa situação há necessidade de se buscar produtos alternativos que tenham efeito nestas populações. Diversos estudos demonstraram que os óleos essenciais de Syzygium aromaticum e Citrus sinensis apresentam pronunciada atividade larvicida, assim, este trabalho teve por objetivo avaliar o potencial destes produtos como alternativa de controle larvicida para populações de A. aegypti resistentes ao organofosforado temephos e verificar o efeito da associação deste inseticida aos óleos essenciais sobre a atividade larvicida. Avaliou-se também, a influência dos óleos essenciais na oviposição do vetor quando presentes nos sítios de postura. A comparação da atividade larvicida nas populações resistentes e suscetíveis foi realizada por meio das concentrações letais obtidas em ensaios de dose-resposta, seguindo metodologia proposta pela Organização Mundial da Saúde. Para avaliar o efeito da associação dos óleos essenciais ao temephos comparou-se a atividade larvicida das associações com a do temephos e o efeito no comportamento de oviposição foi avaliado pela comparação do número de ovos colocados nos sítios de postura, contendo soluções dos óleos essenciais em relação aos contendo somente água. Os resultados revelaram que os óleos essenciais exerceram atividade ...
Dengue fever an acute infectious disease caused by Flaviviridae family virus, transmitted to humans by the mosquitoes bite of Aedes genus. It is considered one of the most public health problems in the world. The Aedes aegypti is the only known vector in the Americas and in Brazil is present in 26 states and the federal district. The unavailability of a vaccine to immunize people against the four dengue serotypes restricted the disease prevention to the vector control. The control is done by chemical insecticides application, but the frequent use in high doses, have selected resistant mosquito populations. In front of this situation, it is necessary to seek for alternative products that have effect on these populations. Several studies demonstrated that Syzygium aromaticum and Citrus sinensis essential oils have larvicidal activity, so the aim of this study was to evaluate the potential of the essencial oils as an alternative to control A. aegypti larvae resistant to the organophosphate temephos and analyze the effect of this insecticide and essencial oils association on the larvicidal activity. It was evaluated too the influence of essencial oils on vector oviposition, when present on the posture sites. The larvicidal activity was assessed by dose-response tests, according to the methodology proposed by the World Health Organization. To evaluate the effect of essential oils associatiate with temephos, the larvicidal associations activity was compared with the temephos. The effect on oviposition behavior was evaluated comparing the number of eggs in laying sites containing essential oils in relation to the number of eggs in laying sites containing only water. The results demonstrated that essential oils had larvicidal activity in resistant and susceptible to temephos populations, being an alternative to resistance management. The association of temephos and essential oils had an antagonist ...
Dengue fever an acute infectious disease caused by Flaviviridae family virus, transmitted to humans by the mosquitoes bite of Aedes genus. It is considered one of the most public health problems in the world. The Aedes aegypti is the only known vector in the Americas and in Brazil is present in 26 states and the federal district. The unavailability of a vaccine to immunize people against the four dengue serotypes restricted the disease prevention to the vector control. The control is done by chemical insecticides application, but the frequent use in high doses, have selected resistant mosquito populations. In front of this situation, it is necessary to seek for alternative products that have effect on these populations. Several studies demonstrated that Syzygium aromaticum and Citrus sinensis essential oils have larvicidal activity, so the aim of this study was to evaluate the potential of the essencial oils as an alternative to control A. aegypti larvae resistant to the organophosphate temephos and analyze the effect of this insecticide and essencial oils association on the larvicidal activity. It was evaluated too the influence of essencial oils on vector oviposition, when present on the posture sites. The larvicidal activity was assessed by dose-response tests, according to the methodology proposed by the World Health Organization. To evaluate the effect of essential oils associatiate with temephos, the larvicidal associations activity was compared with the temephos. The effect on oviposition behavior was evaluated comparing the number of eggs in laying sites containing essential oils in relation to the number of eggs in laying sites containing only water. The results demonstrated that essential oils had larvicidal activity in resistant and susceptible to temephos populations, being an alternative to resistance management. The association of temephos and essential oils had an antagonist ...
Descrição
Palavras-chave
Aedes aegypti, Controle vetorial, Dengue, Ciências da vida, Disease vector control
Como citar
ARAUJO, Adriana Faraco de Oliveira. Atividade larvicida dos óleos essenciais de Syzygium aromaticum e Citrus sinensis em populações de Aedes aegypti. 2014. 63 f. Dissertação (mestrado) - Universidade Estadual Paulista “Julio de Mesquita Filho”, Faculdade de Filosofia, Ciências e Letras, 2014.