Evaluation of Single and Periodic Applications of Chlorpyrifos to Control German Cockroach (Orthoptera: Blattellidae) Populations in Multifamily Dwellings

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Abstract:

Multifamily apartment buildings were treated with formulations of chlorpyrifos by different treatment strategies. Single applications were made with a water emulsion spray of 0.50% chlorpyrifos or Killmaster II (a slow-release formulation containing 2% chlorpyrifos) to 79 apartments. Periodic reapplications (five) were made with a 0.25% water emulsion spray of chlarpyrifos on a monthly cycle to each of 14 apartments initially treated with the 0.50% spray. Populations of Blattella germanica (L.) were evaluated with sticky traps before treatment and reevaluated monthly for 7 months after treatment to determine insecticide efficacy. Reapplication treatments also included the use of a questionnaire to aid in efficacy evaluation. Single applications of the slow-release formulation and the periodic treatments with 0.25% chlorpyrifos yielded nearly twice the percent reduction in German cockroach numbers than did single treatments of 0.50% chlorpyrifos tor the 7 months of this study. Questionnaire results indicated a reduction in insecticide use by residents in the first 2 months of the study; however, there was a trend toward increased pesticide use by residents in the sixth and seventh months in those apartments that had received periodic retreatments. There was a general dissatisfaction by residents with the scheduled retreatment strategy because the cockroach populations did not appear to decline substantially through time.

Document Type: Research Article

Publication date: June 1, 1982

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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