Study on the biological characteristics of Culex pipiens pallens resistance to cypermethrin and susceptibility of the species at different temperatures

Objective To compare the biological characteristics of Culex pipiens pallens resistance to cypermethrin and susceptibility of the species at different temperatures in the laboratory.Methods The growth,reproduction,and life expectancy of two mosquito populations were observed under laboratory conditions at different temperatures(17 ℃,25 ℃,and 28 ℃).Results Culex pipiens pallens had a longer life span at 17 ℃ than at 28 ℃.At the same temperature,adult mosquitoes that were resistant to cypermethrin had a shorter lifespan and quicker development of eggs,larvae,and pupae than did mosquitoes that were susceptible to cypermethrin;differences between resistant and susceptible populations were significant.Mosquito larvae that were susceptible to cypermethrin had a higher mortality rate;differences between resistant and susceptible populations were significant.Conclusion Culex pipiens pallens resistance to cypermethrin results in diminished ability to adapt to environments with different temperatures.