José Iannacone

Integración del control químico y etológico para la supresión poblacional de Blatella germánica (Linnaeus) (Dictyoptera: Blatellidae) en Lima, Perú

German cockroaches Blatella germanica (Linnaeus, 1767) is an arthropod specie of importance in Public Health. Effectiveness of integration chemical and ethological control for suppression of B. germanica was evaluated. Experimental tests in a nursery school of Surquillo Municipality District, Lima, Peru were performed. First trial: Two formulations of cypermethrin, wet dust and emulsify concentrate were evaluated on B. germanica. 38 craft sticky traps impregnated with food bait were placed. Counts were performed at 2 days, 5 days and 8 days, through a count of small and big nymphs, and, adult males and females. Second trial: A smoking cypermethrin was evaluated. 16 craft sticky traps without natural food bait and with the same characteristics of first trial were placed. Counts were performed at 10 days, through a count of B. germanica in two densities of infestation. Third trial: Susceptibility of B. germanica to three insecticides (cypermethrin 3‰; cypermethrin 8‰, and chlorpyrifos + cypermethrin 8‰) under laboratory conditions with two systems of application by contact: residual (impregnate with filter paper) at 3 days, 6 days, 14 days and 21 days, and direct spray at 3 days were determined. Wet dust presented higher effectiveness at 8 days of exposure on B. germanica was found. Smoking cypermethrin presented effectiveness in population suppression only at low densities of B. germanica. At laboratory conditions at 3 days exposure, the three insecticides showed an effectiveness of 100% when were applied by spraying. Residual effect of 100% at 21 days only was observed with chlorpyrifos + cypermethrin. Possibilities of integration of ethological and chemical control for population supression of B. germanica in Lima, Peru were analyzed.