AU:SONG Fenglin , ZHAO Tongyan, DONG Yande , LU Baolin

AD:( Institute of Microbiology and Epidemiology , Beijing 100071 , China)

【Abstract】Objective 　To compare the biological characteristics of Culex pipiens pallens between permethrin2resistant strain and the susceptible strain. 　Methods 　In laboratory , the biological characteristics about bloodsucking , reproduction and development of permethrin2resistant and susceptible strains were observed and recorded. Life table of the experimental popula2 tions was constituted. 　Results 　The bloodsucking rate of resistant strain was lower than susceptible strain and the difference was significant . The life2span of adults of resistant strain and the developmental duration of eggs , larvae and pupae were longer than susceptible strain and the difference was significant . The death rate of eggs of resistant strain was higher than that of sus2 ceptible strain and the difference was significant . The permethrin2resistant strain showed a fitness value of 0158 relative to the susceptible strain. 　Conclusion 　The permethrin resistance of Culex pipiens pallens may result in a disadvantage to its repro2 duction and development .

【Key words】　Culex pipiens pallens ; Permethrin ; Drug re sistance Supported by the National Natural Science Foundation of China (No139470643)

Corresponding author , E2mail : zhaoty @nic. bmi. ac. cn