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Control of German cockroach (Dictyoptera: Blattellidae) with residual toxicants in bait trays

Koehler, P.G., Strong, C.A., Patterson, R.S.
Journal of economic entomology 1996 v.89 no.6 pp. 1491-1496
Blattella germanica, insecticides, insecticide residues, baits, trays, toxicity, mortality, lethal dose, wettable powders, emulsifiable concentrates, cypermethrin, insect control, chemical control
Bait trays that contained a bait base surrounded by a surface treated with residual treatments of pyrethroids, an organophosphate, and a carbamate were evaluated for German cockroach, Blattella germanica (L.), control. LC50s of baited residual insecticide deposits were 1-3 micrograms/cm2 for lambda-cyhalothrin, 7-29 micrograms/cm2 for cypermethrin, chlorpyrifos and cyfluthrin, 55-150 micrograms/cm2 for permethrin, and 431-852 micrograms/cm2 for bendiocarb. Plastic surfaces provided greater mortality of all stages of German cockroaches at 24 h than aluminum foil and filter paper surfaces; for instance, cypermethrin killed 100% of males on plastic compared with 90% on aluminum and 70% on paper. Also, wettable powder formulations killed significantly higher percentages of German cockroaches than did emulsifiable concentrates and technical active ingredient. LT50s of cockroaches confined to treated surfaces were 0.94-1.64 min for cypermethrin and lambda-cyhalothrin, 2.09-4.11 min for cyfluthrin and permethrin, and 15.12-21.62 min for chlorpyrifos and bendiocarb. The use of an inedible bait base significantly enhanced kill of bait trays treated with cypermethrin; 94% of male cockroaches died in 4 d with baited trays compared with 43% mortality with trays containing no bait.