[Study on the biological characteristics of permethrin-resistant and susceptible strains of Culex pipiens pallens].

OBJECTIVE: To compare the biological characteristics of Culex pipiens pallens between permethrin-resistant strain and the susceptible strain. METHODS: In laboratory, the biological characteristics about bloodsucking, reproduction and development of permethrin-resistant and susceptible strains were observed and recorded. Life table of the experimental populations was constituted. RESULTS: The bloodsucking rate of resistant strain was lower than susceptible strain and the difference was significant. The life-span 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 susceptible strain and the difference was significant. The permethrin-resistant strain showed a fitness value of 0.58 relative to the susceptible strain. CONCLUSION: The permethrin resistance of Culex pipiens pallens may result in a disadvantage to its reproduction and development.