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Evaluación del triflumurón y la mezcla de Bacillus thuringiensis más Bacillus sphaericus para el control de las formas inmaduras de Aedes aegypti y Culex quinquefasciatus en sumideros en Cali, Colombia Translated title: Evaluation of the triflumuron and the mixture of Bacillus thuringiensis plus Bacillus sphaericus for control of the immature stages of Aedes aegypti and Culex quinquefasciatus (Diptera: Culicidae) in catch basins

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      Abstract

      Introducción. En Cali los sumideros son uno de los principales criaderos de Aedes aegypti y Culex quinquefasciatus que son controlados por la Secretaría de Salud Municipal utilizando el insecticida triflumurón desde 1999. Se sospecha falla al tratamiento. Objetivos. Evaluar la eficacia del Starycide® (triflumurón) y VectoMax® (mezcla bacteriana de Bacillus thuringiensis var. israelensis y Bacillus sphaericus) en el control de A. aegypti y C. quinquefasciatus en los sumideros y determinar el efecto residual de una única aplicación de VectoMax®, en épocas de alta y baja pluviosidad. Materiales y métodos. La eficacia de los productos fue medida en 60 sumideros de una zona residencial de Cali por un período de 90 días. La media de individuos inmaduros (larvas y pupas de A. aegypti y C. quinquefasciatus) fueron obtenidas quincenalmente de 40 sumideros intervenidos (20 con triflumurón y 20 con VectoMax®) y 20 sin tratamiento (grupo testigo). El efecto residual de la mezcla bacteriana se evaluó quincenalmente en 10 sumideros en cada temporada climática. Resultados. Los sumideros tratados con VectoMax® presentaron diferencias en el promedio de estadios inmaduros en ambas especies frente al testigo (p<0,01). En contraste, el tratamiento con triflumurón sólo presentó diferencias en los estadios inmaduros de A. aegypti con respecto al testigo (p<0,001). El efecto residual del VectoMax® fue mayor en la época de baja pluviosidad con respecto al testigo (p<0,001). Conclusión. La mezcla bacteriana fue el tratamiento más eficaz en el control de ambas especies durante el período evaluado (15 días.)

      Translated abstract

      Introduction.In Cali, Colombia, catch basins (streetside storm drains) are one of the main larval habitats of Aedes aegypti and Culex quinquefasciatus. Since 1999, these mosquitoes have been controlled by the Secretaría de Salud Municipal (Secretary of Municipal Public Health) using the larvicide triflumuron. Because of high densities of these mosquitoes that remain in the city, treatment failure was suspected -possibly insecticide resistance of the target species. Objectives. The efficacy of triflumuron and VectoMax® (biorational mixture of Bacillus thuringiensis var. israelensis plus Bacillus sphaericus) were evaluated in the control of A. aegypti and C. quinquefasciatus in catch basins. The residual effect of a single application of the biorational formulation was determined in catch basins during periods of high and low rainfall. Materials and methods. The efficacy of the products was measured in 60 catch basins located in a residential neighborhood of Cali for a period of 90 days. The mean number of immature. Control de estadios inmaduros de mosquitos en sumideros instars ( A. aegypti and C. quinquefasciatus larvae and pupae of both species) was determined biweekly from 40 catch basins with insecticide intervention (20 treated with triflumuron, 20 with VectoMax®) and 20 untreated (control group). The residual effect of the biorational larvicide was evaluated biweekly in 10 catch basins during each of the 2 climatic periods. Results. The catch basins treated with VectoMax® presented a significantly lower mean number of immature instars of both species compared with the control ( p<0.01). In contrast, the triflumuron treatment significantly reduced only immature instars of A. aegypti compared with the control ( p<0.001). The residual effect of VectoMax® was higher during low rainfall compared to the control ( p<0.001). Conclusion. The biorational formulation was the more effective treatment for the control of both species during the period of evaluation (15 days).

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      Most cited references 23

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            Author and article information

            Affiliations
            [1 ] Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM) Colombia
            [2 ] Secretaría de Salud Pública Municipal de Cali Colombia
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Journal
            bio
            Biomédica
            Biomédica
            Instituto Nacional de Salud (Bogotá )
            0120-4157
            June 2008
            : 28
            : 2
            : 224-233
            S0120-41572008000200007

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

            Product
            Product Information: SciELO Colombia
            Categories
            TROPICAL MEDICINE

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