Resistance analysis of Culex pipiens pallens in Jining city

Objective To investigate the resistance situation to commonly used chemical insecticides of Culex pipiens pallens in Jining city,and provide a basis for chemical prevention and control of mosquito rationally and effectively.Methods Detecting the 5 insecticide resistance of resistant strain and sensitive strain of Culex pipiens pallens by WHO bioassay method.Results The resistance level of Culex pipiens pallens of 5 spots to acetofenate,DDVP,propoxur,deltamethrin and cypermethrin were 1.14 to 7.99 times,6.10 to 21.18 times,3.46 to 6.67 times,8.50 to 16.50 times and 28.33 to 135.83 times than that of sensitive strain.Conclusion Culex pipiens pallens in Jining city have generated different extents of resistance to 5 chemical insecticides,which is higher to cypermethrin and DDVP,and lower to acetofenate and propoxur.Appropriate measures should be taken to overcome or delay the generate and development of insecticide-resistance of mosquito.