Effectiveness of Six Insecticide Treatment Strategies in the Reduction of German Cockroach (Orthoptera: Blattellidae) Populations in Infested Apartments

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Abstract
Six insecticide treatment strategies that included the use of chlorpyrifos and dichlorvos were evaluated in apartments infested with Blattella germanica (L.). Following treatments, populations were monitored monthly for 4 months with sticky traps. Strategies which used chlorpyrifos were the most effective in reducing cockroach populations. Inclusion of dichlorvos in spray mixtures did not increase the effectiveness of chlorpyrifos. Dichlorvos total-release aerosol bombs were effective only when used immediately following an application of chlorpyrifos. Populations increased in 37.5% of the apartments that were next to units treated with chlorpyrifos plus dichlorvos, while populations increased in 50% of the apartments adjacent to units treated with dichlorvos total-release bombs.