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Detection of pyrethroid resistance and cross resistance to DDT in seven field-collected strains of the German cockroach, Blatella germanica (L.) (Dictyoptera: Blattellidae)



Detection of pyrethroid resistance and cross resistance to DDT in seven field-collected strains of the German cockroach, Blatella germanica (L.) (Dictyoptera: Blattellidae)



Journal of Biological Sciences. March-April; 62: 382-387



The insecticide resistance status in seven field collected strains of the German cockroach, Blattella germanica (L.) against three pyrethroids: permethrin, cypermethrin and cyfluthrin and cross resistance between these pyrethroids and organochlorine DDT were detected by glass jar test method. For detection of pyrethroid resistance in adult males of field collected strains, the glass jar knockdown test was used and the susceptibility level of each field strain was compared with that of a standard susceptible strain based on Resistance Ratio (RR) calculated by dividing the KT 50 of field strain by the KT 50 of standard susceptible strain. Tests were replicated three to six times in groups of ten cockroaches. For detection of DDT resistance in adult males of the field collected strains, the glass jar mortality test was used to compare the susceptibility level of each field strain with that of susceptible strain based on the mortality rate obtained from exposing them to a single discriminating dose. Tests were replicated three or four times in groups of ten cockroaches. The results of this study indicated that all the field-collected strains of German cockroach were resistant to three pyrethroids: permethrin, cypermethrin and cyfluthrin, i.e., the Resistance Ratios (RRs) of different strains ranged from 5.26 to 23.7 fold for permethrin, 2.9 to 20.7 fold for cypermethrin and 2.4 to 11.42 fold for cyfluthrin, respectively. The order of resistance level to three pyrethroid insecticides was permethrin>cypermethrin>cyfluthrin. Among these seven fields collected strains, five showed high resistance to organochlorine DDT indicating the possible cross resistance between three pyrethroid insecticides used in this study and the organochlorine DDT. Present results demonstrated the differential responses among field collected strains of German cockroach to pyrethroid and DDT insecticides. The information achieved on cross resistance between these three pyrethroid insecticides used in this study and organochlorine DDT could provide the preliminary information for a mechanistic study on possible mechanisms of insecticide resistance in pyrethroid resistant strains.

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Accession: 022370219

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