Cross-resistance characteristics of deltamethrin-resistant strain of Tribolium castaneum (Herbst)

摘要

The results showed that deltamethrin-resistant (x78.62) strain of T. castaneum extended high degree of cross-resistance to other synthetic pyrethroids, viz., cypermethrin (x48.94), lambda-cyhalothrin (x45.50) and permethrin (x58.11). However, in case of fenvalerate, cross resistance ratio could not be determined as it gave 16.6 percent mortality at 2 percent concentration. The cross resistance to several organophosphorus had a varied range, malathion (x23.43), chiorpyriphos (x22.45), fenitrothion (x10.41), quinalphos (x6.17), temephos (x5.72), phosphamidon (x5.54), phorate (x4.03) and dichlorvos (x3.31). However, there was no cross-resistance between the deltamethrin-resistant strain and monocrotophos (x1.10). The resistance level of p,p' DDT andlindane could not be determined resulting 16.6 and 20.0 percent mortality, respectively, at 2 percent. The resistant strain had 6.13-fold resistant to, carbosulfan. Thus, the observed inrra and inter-group cross-resistance spectrum of the resistant strain was a sequel to the selection with deltamethrin.