An analysis of surveillance results of Culex pipiens pallens/quinquefasciatus in Changsha,Hunan Province,China,2017-2022
Objective To analyze the seasonal fluctuation and distribution in different habitats of Culex pipiens pallens/quinquefasciatus in Changsha,Hunan Province,China from 2017 to 2022,so as to provide a scientific basis for the control of Cx.pipiens pallens/quinquefasciatus and mosquito-borne infectious diseases in Changsha.Methods According to the National Vector Surveillance Program,Cx.pipiens pallens/quinquefasciatus mosquitoes were obtained using the light trap method in urban residential areas,parks,hospitals,residential houses,and pig pens from April to November of 2017 to 2022.The mosquito population density,seasonal fluctuation,and distribution were analyzed.The mosquito density of different years was compared through analysis of variance(ANOVA)with a completely randomized design,and mosquito density in different months and different habitats was analyzed by two-way ANOVA.Results The mean annual density of Cx.pipiens pallens/quinquefasciatus in Changsha from 2017 to 2022 was 17.83 mosquitoes/light·night.Throughout a year,mosquito density showed a bimodal distribution,peaking in May-June and September.Density differed significantly in different months(F=15.921,P<0.001),which was highest in May(38.92 mosquitoes/light·night)and June(40.42 mosquitoes/light·night).The mosquito densities of different habitats were also significantly different(F=36.014,P<0.001),with the highest levels in pig pens(40.06 mosquitoes/light·night)and residential houses(30.23 mosquitoes/light·night).There was interaction between"month"and"habitat"(F=5.563,P<0.001).Conclusions The peak activeity of Cx.pipiens pallens/quinquefasciatus is in May and June,and the density in pig pens and residential house is high.Specific control programs should be development depending on habitat and season,and mosquito control should be strengthened in rural areas in May and June.
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