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      Suscetibilidade de larvas de Culex quinquefasciatus a diferentes inseticidas Translated title: Susceptibility of Culex quinquefasciatus larvae to different insecticides

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          Abstract

          INTRODUÇÃO: O presente estudo teve como objetivo avaliar a suscetibilidade de larvas de Culex quinquefasciatus a dois piretróides (Cipermetrina e Deltametrina), dois derivados da Avermectina (ivermectina e abamectina) e a um organofosforado (Temefós). MÉTODOS: Larvas de 3º e 4º instares de C. quinquefasciatus foram expostas a diferentes concentrações destes (onze repetições) seguindo o protocolo da Organização Mundial de Saúde. Uma hora após a exposição, as larvas foram lavadas em água desclorada, transferidas para recipientes plásticos contendo água sem cloro, alimentadas e observadas por períodos de 24h, até se transformarem em adultos. Para a determinação das concentrações letais, os valores foram submetidos à análise de regressão usando o modelo probit pelo programa Minitab 15. RESULTADOS: Diferenças entre as estimativas da CL50 e CL90 justificaram que a população de mosquitos testada apresenta heterogeneidade em resposta aos inseticidas, sendo a maior concentração utilizada para a CL50, a partir da análise de probit para o Temefós. Todos os inseticidas avaliados causaram mortalidade mais acentuada nas primeiras 24h exceto quando expostas à ivermectina. CONCLUSÕES: As larvas são suscetíveis a todos os inseticidas testados e há uma necessidade de um monitoramento dos inseticidas utilizados.

          Translated abstract

          INTRODUCTION: This study aimed to assess the susceptibility of Culex quinquefasciatus larvae to two pyrethroids (Cypermethrin and Deltamethrin), two derivatives of Avermectin (Ivermectin and Abamectin) and an organophosphate (Temephos). METHODS: Third- and fourth-instar larvae of C. quinquefasciatus were exposed to different concentrations of insecticides (eleven repetitions) according to the World Health Organization's protocol. One hour after exposure, larvae were washed in dechlorinated tap water, transferred to plastic containers containing water without chlorine, fed and observed for periods of 24h until reaching adulthood. To determine lethal concentrations, the obtained values were submitted to regression analysis using the probit model with the Minitab 15 program. RESULTS: The highest concentration used for the LC50 from probit analysis was for Temephos. The evaluated insecticides caused more pronounced larvae mortality in the first 24h with the exception of those exposed to ivermectin. CONCLUSIONS: This study demonstrates that larvae are susceptible to all tested insecticides and that there is a need for monitoring the use of insecticides.

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          Most cited references34

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          Instruction for determining the susceptibility or resistance of mosquito larvae to insecticides

          (1981)
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            Culicidología médica. Identificação, biologia, epidemiologia

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              Analysis of Quantal Response Data

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                rsbmt
                Revista da Sociedade Brasileira de Medicina Tropical
                Rev. Soc. Bras. Med. Trop.
                Sociedade Brasileira de Medicina Tropical - SBMT (Uberaba )
                1678-9849
                August 2011
                : 44
                : 4
                : 486-489
                Affiliations
                [1 ] Universidade Federal de São João del-Rei
                [2 ] Universidade Federal de Minas Gerais Brazil
                Article
                S0037-86822011000400017
                10.1590/S0037-86822011000400017
                efabf151-90f5-4be6-8c01-3054af0eaab7

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0037-8682&lng=en
                Categories
                TROPICAL MEDICINE

                Infectious disease & Microbiology
                Culex,Insecticides,Temephos,Pyrethroids,Avermectins,Inseticidas,Temefós,Piretróides,Avermectinas

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