title: [Experimental study on cross-resistance of Culex pipiens pallens to 3 kinds of chemical pesticides].
abstract: OBJECTIVE
  To understand the cross-resistance of Culex pipiens pallens to common pesticides, so as to provide the evidence for improving the application of chemical pesticides.
  
  
  METHODS
  The IV instar larvae of DDVP-resistant, propoxur-resistant and cypermethrin-resistant strains as well as the sensitive strain of Culex pipiens pallens were collected to detect the resistance to DDVP, propoxur and cypermethrin based on the WHO bioassay method.
  
  
  RESULTS
  The resistance coefficients of DDVP-resistant strain to DDVP, propoxur and cypermethrin were 14.47, 8.96 and 207.27 respectively. The resistance coefficients of propoxur-resistant strain to DDVP, propoxur and cypermethrin were 3.27, 6.93 and 8.65 respectively. The resistance coefficients of cypermethrin-resistant strain to DDVP, propoxur and cypermethrin were 2.93, 1.61 and 501.11 respectively.
  
  
  CONCLUSIONS
  The resistance and cross-resistance could be generated during the long-term application of a single kind of chemical pesticide, and we should pay more attention to the varieties and dosages of them.
authors.forename: Bint
authors.initials: B
authors.lastname: Jiang
authors.forename: Shi-Gen
authors.initials: SG
authors.lastname: Li
authors.forename: Xin
authors.initials: X
authors.lastname: Quan
authors.forename: Qing-Jie
authors.initials: QJ
authors.lastname: Xue
authors.forename: Wen-Bin
authors.initials: WB
authors.lastname: Tan
authors.forename: Yong-Chun
authors.initials: YC
authors.lastname: Liu
authors.forename: Xin-Guo
authors.initials: XG
authors.lastname: Wang
authors.forename: Huai-Wei
authors.initials: HW
authors.lastname: Wang
mesh_terms: D000818:Animals; D003465:Culex / Q000187:drug effects* / Q000254:growth & development; D007305:Insecticide Resistance; D007306:Insecticides / Q000494:pharmacology*; D007814:Larva / Q000187:drug effects; D021261:Parasitic Sensitivity Tests
chemical_list: D007306:Insecticides