[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.


CONCLUSIONS
The permethrin resistance of Culex pipiens pallens may result in a disadvantage to its reproduction and development.
Song
Feng-lin
FL
Institute of Microbiology and Epidemiology, Beijing 100071, China.
Zhao
Tong-yan
TY
Dong
Yan-de
YD
Lu
Bao-lin
BL
D000818:Animals; D003465:Culex / Q000187:drug effects* / Q000254:growth & development; D007305:Insecticide Resistance / Q000502:physiology*; D007306:Insecticides / Q000494:pharmacology*; D026023:Permethrin / Q000494:pharmacology*
D007306:Insecticides; D026023:Permethrin