Developmental stage- and gender-dependent differential susceptibility ofGerman cockroaches (Dictyoptera : Blattellidae) to various commercialbaits

摘要

The toxicity of five commercial bait formulations (Raid Max, Combat, Maxforce, Avert PT310, and Magnetic Roach Food) against various stages and sexes of JWax-susceptible and Muncie-resistant strains of German cockroaches, Blatella germanica (L.), was investigated in choice and no-choice bioassays. The role of strain, bait, stage, sex, and feeding bioassay main effects on cockroach mortality was determined. The biological toxicity of all five baits differed markedly among the different stages and sexes of both strains in both types of feeding bioassays. The range of LT(50)s for each bait tested against various life stages in choice bioassays was wider and slower in killing cockroaches than in no-choice bioassays. The LT(50)s of nymphs differed significantly for each bait tested. Large nymphs were less susceptible to baits than small nymphs. Except for exposure to Maxforce bait, all baits tested affected adult genders differently.