title: [Study on the biological characteristics of permethrin-resistant and susceptible strains of Culex pipiens pallens].
abstract: 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.
authors.affiliation: Institute of Microbiology and Epidemiology, Beijing 100071, China.
authors.forename: Feng-lin
authors.initials: FL
authors.lastname: Song
authors.forename: Tong-yan
authors.initials: TY
authors.lastname: Zhao
authors.forename: Yan-de
authors.initials: YD
authors.lastname: Dong
authors.forename: Bao-lin
authors.initials: BL
authors.lastname: Lu
mesh_terms: D000818:Animals; D003465:Culex / Q000187:drug effects* / Q000254:growth & development; D007305:Insecticide Resistance / Q000502:physiology*; D007306:Insecticides / Q000494:pharmacology*; D026023:Permethrin / Q000494:pharmacology*
chemical_list: D007306:Insecticides; D026023:Permethrin