Entomotropica (2003) 18, 63-68

Yasmin Rubio-Palis and Luis Antonio Guerra (2003)
Evaluación del poder residual del insecticida deltametrina en telas de mosquiteros
[Evaluation of the residual power of the insecticide deltamethrin in bed net fabrics]
Entomotropica 18 (1), 63-68
Abstract: Bioassays were conducted with mosquitoes Aedes aegypti (Linnaeus) (Diptera: Culicidae) "Rock" strain to evaluate the residual power of the pyrethroid insecticide deltamethrin 2.5% E.C. on white and green bed net fabrics of polyester and nylon, treated manually and manufacturally (PermaNet^TM). Bioassays consisted in exposing ten mosquitoes during three minutes to each treated material in triplicates and its controls. The number of mosquitoes knockdown after ten minutes and the number dead after 24 hours was recorded. After each bioassay, netting materials were hand washed with soap and allowed to dry in the shade. For each test, nets were washed until mortality reached 50% or less. The residual power of deltamethrin decreased with the increase in the number of washes. It was found 70% mortality in mosquitoes exposed to the PermaNet^TM material after seven washes, requiring re-impregnation after eight washes (36.6% mortality). The residual power of the insecticide was kept up to four-five washes in those netting materials treated manually. The higher residual power shown by deltamethrin in industrial treated nets (PermaNet^TM) is an advantage that should be considered when contemplating the use of insecticide treated materials (mosquito nets/ curtains) as an alternative or complementary vector control measure for control programs.

Se realizaron bioensayos con mosquitos Aedes aegypti (Linnaeus) (Diptera: Culicidae) cepa "Rock" para evaluar el poder residual del insecticida piretroide deltametrina 2,5% C.E. en telas blancas y verdes de poliéster y nylon, tratados en forma manual e industrial (PermaNet^TM). Los bioensayos consistieron en exponer diez mosquitos durante tres minutos a cada una de las telas tratadas por triplicado y sus respectivos controles. Se registró el número de mosquitos caídos a los diez minutos (efecto "knockdown") y la mortalidad a las 24 horas. Luego de cada bioensayo, se procedía a lavar las telas a mano con jabón y se dejaban secar a la sombra. Para cada prueba, se lavaron las telas hasta observar mortalidades iguales o menores de 50%. En general se observó que a medida que aumenta el número de lavadas se reduce el poder residual del insecticida. En las telas PermaNet^TM, tratadas en forma industrial, se observó 70% de mortalidad a las 24 horas luego de siete lavadas, requiriéndose la re-impregnación luego de ocho lavadas (36,6% de mortalidad). En telas tratadas manualmente el poder residual se mantiene hasta la cuarta o quinta lavada. El mayor poder residual de la deltametrina observado en telas tratadas en forma industrial (PermaNet^TM) representa una ventaja que debe ser considerada cuando se plantee el uso de telas tratadas (mosquiteros/cortinas) con insecticida como medida alternativa o complementaria en programas de control de vectores.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Spanish)
Database assignments for author(s): Yasmin Rubio-Palis

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Aedes aegypti