Objective To analyze the results of mosquito surveillance in Liuzhou city from 2016 to 2019,in order to understand the density,population distribution,and seasonal trend of local mosquitoes,and to provide scientific basis for the prevention and control of mosquito-borne diseases.Methods Mosquito trap lamp method and mosquito ovitrap method were used to monitor different environmental types in Liuzhou city.Species and sex were identified and counted according to"Vector Density Monitoring Method:Mosquitoes"(GB/T 23797-2009).SPSS 23.0 software was used to analyze the data.Results The total number of female mosquitoes captured in Liuzhou city from 2016 to 2019 was 12 371,and the average total density of adult mosquitoes was 1.88 per hour/lamp.The seasonal trend of the total density of adult mosquitoes was bimodal,with the peak values in May[4.04 mosquitoes/hour·lamp]and September[2.51 mosquitoes/hour·lamp],respectively.The main mosquito species were Culex quinquefasciatus,Aedes albopictus,Anopheles sinensis,and Armigeres subalbatus.Culex quinquefasciatus was the dominant mosquito species with a composition ratio of 92.23％and a mosquito density of 1.65 mosquitoes per hour/lamp.Among different environmental types,the total density of adult mosquitoes in livestock sheds was the highest[6.07 mosquitoes/(hour·lamp)],followed by that in waste recycling stations[3.04 mosquitoes/(hour·lamp)].Among different urban areas,the total density of adult mosquitoes in Liubei district was the highest[2.29/(hour·lamp)].There were significant differences among different environmental types and the proportion of mosquito species in urban areas(x2 value was 5 855.912 and 410.205 respectively,P＜0.001).The results of special monitoring of Aedes mosquitoes showed that Aedes mosquitoes were captured from April to November in Liuzhou city.The ovitrap index was high from May to August and greater than 20.00,which reached its peak in July(38.34).The mosquito-ovitrap index(23.27)in the park was the highest among the 5 monitoring environments.The hospital had the highest mosquito density index(0.72 mosquitoes/unit).Among different urban districts,the ovitrap index(20.93)and mosquito density index(0.80 mosquitoes/unit)were the highest in Liubei district.Conclusions Culex quinquinquae was the dominant mosquito species in Liuzhou city.Livestock sheds and waste recycling stations were the main sites of mosquito infestation.The peak of adult mosquito density occurred in May and September each year.It is suggested that local governments continue to strengthen adult mosquito monitoring and continue to carry out scientific and effective comprehensive environmental control and mosquito control,so as to prevent the occurrence and prevalence of mosquito-borne infectious diseases.
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