title: [Study on biological characteristics of cypermethrin-resistant and -susceptible strains of Aedes albopictus at different temperatures].
abstract: OBJECTIVE
  To study the biological characteristics of cypermethrin-resistance strain and -susceptible strain of Aedes albopictus under different controlled temperatures in the laboratory.
  
  
  METHODS
  The two strains were raised at three different temperatures, 20, 25 degrees C and 28 degrees C respectively, and the biological characteristics of the two mosquito strains, such as reproduction, development and life expectancy, were observed and recorded in the laboratory.
  
  
  RESULTS
  The life expectancy of both strains became shorter as the temperature raised, and the resistant strain(69.37% ± 0.01%, 77.04% ± 0.07%) lived shorter than the susceptible strain(85.24% ± 0.03%, 88.23% ± 0.05%)in average. Under 25 degrees C, the hatching rate of resistant strain decreased by 25.88%, and the pupation rate decreased by 11.18%. In the three temperatures, all the life expectancy expanded as the temperature went up, the periods for the susceptible strain were 19.75 ± 0.10, 23.65 ± 0.07 d and 25.08 ± 0.08 d under 28, 25 degrees C and 20 degrees C. While life expectancy for the resistant strain decreased to 17.21 ± 0.09, 20.95 ± 0.09, 22.58 ± 0.10 d. Under the same temperature, the development timing of the resistance strain was longer than that of the susceptible strain, and the period was the longest under 28 degrees C (156.2 h, 137.1 h). In the three temperatures, all the development periods expanded as the temperature went up, the susceptible and resistant larvae developed 137.1 d and 163.3 d, 247.7 d and 156.2 d, 182.3 d and 263.2 d under 28, 25 degrees C and 20 degrees C. The differences show statistic significance (P < 0.05).
  
  
  CONCLUSIONS
  The resistance of A. albopictus to cypermethrin results in the decrease of adaptability to the environment change and the disadvantage of reproduction at different temperatures.
authors: Xiao-Dan
authors: XD
authors: Huang
authors: Peng
authors: P
authors: Cheng
authors: Jiu-Xu
authors: JX
authors: Zhao
authors: Yu-Hua
authors: YH
authors: Dai
authors: Hong-Mei
authors: HM
authors: Liu
authors: Mao-Qing
authors: MQ
authors: Gong
authors: Jing-Xuan
authors: JX
authors: Kou
mesh_terms: D000330:Aedes / Q000187:drug effects* / Q000254:growth & development / Q000502:physiology; D000818:Animals; D005260:Female; D007305:Insecticide Resistance; D007306:Insecticides / Q000494:pharmacology*; D008018:Life Cycle Stages / Q000187:drug effects; D008297:Male; D011722:Pyrethrins / Q000494:pharmacology*; D012098:Reproduction / Q000187:drug effects; D013696:Temperature
chemical_list: D007306:Insecticides; D011722:Pyrethrins; C017160:cypermethrin