An analysis of surveillance results of Culex tritaeniorhynchus in Changsha from 2017 to 2023

LIN Bin; CHEN Jianyong; PENG Lai; XIAO Shan; HUANG Yi

doi:10.19821/j.1671-2781.2025.01.011

Abstract：Objective To analyze the temporal and spatial distribution of Culex tritaeniorhynchus in Changsha City from 2017 to 2023,so as to provide scientific basis for the control of Cx.tritaeniorhynchus and the prevention and control of Japanese encephalitis in Changsha.Methods The mosquito light trap method was carried out in urban residential areas,parks,hospitals,peasant household and pig pens from April to November each year,and Cx.tritaeniorhynchus were obtained,and their population density,seasonal fluctuation and distribution patterns in different habitats were analyzed.WPS and SPSS 18.0 softwares were used to process and analysis the data,and the Bonferroni method was used for pairwise comparisons.Results The average mosquito density of Cx.tritaeniorhynchus in Changsha from 2017 to 2023 was 9.75 mosquito/(light·night).The difference of mosquito density in different years was statistically significant(F=2.915,P=0.009).The highest mosquito density was 32.91 mosquito/(light·night)in 2018.The seasonal fluctuation of mosquito density showed a bimodal curve throughout the year,peaking in June and September.The differences of mosquito density in different months were statistically significant(F=3.292,P=0.002),and the highest mosquito density was found in June,which was 37.16 mosquito/(light·night).The differences of the mosquito density of different habitats were statistically significant(F=9.267,P=0.000),and the highest mosquito density was found in pig pens,which was 38.47 mosquito/(light·night).And the mosquito density in rural areas was higher than that in urban areas(F=22.427,P=0.000).Conclusion The density of Cx.tritaeniorhynchus peaks in June and July in Changsha City,and the density of pig pens is the highest,and the mosquito density in rural areas is higher than that in urban areas.The integrated control of Cx.tritaeniorhynchus in rural areas should be strengthened in June and July.