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Laboratory assessment of resistance to commercial insecticide formulations in 2 strains of the german cockroach blattella germanica dictyoptera blattellidae



Laboratory assessment of resistance to commercial insecticide formulations in 2 strains of the german cockroach blattella germanica dictyoptera blattellidae



Bulletin of Entomological Research 73(3): 491-500



The survivors of field treatments of B. germanica (L.) with bendiocarb (strain D) and malathion (strain H) in the UK were bred in the laboratory. The resistance of these 2 strains to commercial formulations of bendiocarb, dioxacarb, propoxur, lindane, dieldrin, malathion, diazinon, fenitrothion, pirimiphos-methyl and permethrin was assessed in 24 h exposures on treated glass plates. Resistance in terms of knockdown or mortality was demonstrated for bendiocarb, dioxacarb and dieldrin in both strains, for malathion in strain H and marginally for permethrin in strain D. Selection with bendiocarb in strain D produced a .times. 4 and .times. 3 increase in resistance to bendiocarb at the LC50 and KD50 levels, respectively. There was no significant cross-resistance to propoxur, but cross-resistance to dioxacarb was evident at the LC50 and KD50 but not the 95% levels. There was little or no cross-resistance in strain D to diazinon, pirimiphos-methyl or fenitrothion. In strain H, malathion selection increased resistance to malathion at the 50% but not the 95% levels; there was no evidence of cross-resistance to diazinon, pirimiphos-methyl or fenitrothion. Some cockroaches from strains D and H were able to recover from knockdown during and after exposure to the carbamates and permethrin. There was no recovery from the organophosphorus or organochlorine insecticides.

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Accession: 005787493

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