Abstract: Objective　To investigate the fluctuations in the population density of Aedes albopictus and changes in the population density of Ae. albopictus in different geographical areas and different breeding habitats in Guangdong Province from 2018 to 2023, so as to provide insights into prevention and control of mosquito⁃borne infectious diseases in the province. Methods　Ae. albopictus surveillance sites were assigned in 1 609 townships (streets) from 121 districts (counties) of 21 cities in Guangdong Province during the period between March and November from 2018 to 2023. The surveillance of the population density of Ae. albopictus was performed once a month in each surveillance site, and once a month in specific settings in cities where dengue were highly prevalent in Guangdong Province from December to February of the next year during the period from 2018 through 2023. Four streets (villages) were selected in each surveillance site according to the geographic orientation, and mosquito ovitraps were assigned in gardens, rooftops or public green belts at residential areas, parks, hospitals and construction sites. All mosquito ovitraps were collected, and the mosquito ovitrap index (MOI) was calculated. The population density of Ae. albopictus was classified into four grades in each surveillance site according to MOI, including no risk, low risk, medium risk and high risk. The risk classification of the Ae. albopictus density was analyzed in each surveillance site each year from 2018 to 2023, and the population density of Ae. albopictus was analyzed at different months and in different geographical areas and breeding habitats.  Results　A total of 118 241 Ae. albopictus surveillance sites were assigned in 21 cities of Guangdong Province from 2018 to 2023, and there were 68.26% of the surveillance sites with the population density of Ae. albopictus that met the requirements for dengue prevention and control, among which low, medium and high risk surveillance sites accounted for 23.61%, 6.67% and 1.47%. The risk classification of the Ae. albopictus density increased rapidly in Guangdong Province since April to May each year from 2018 to 2023, and then gradually reduced since September to October, with the peak during the period between May and July. The mean MOI was 4.21 at each surveillance site in Guangdong Province during the period from 2018 to 2023, with 4.69, 4.80, 4.38, 3.82, 3.38, and 4.33 from 2018 to 2023, respectively. The MOI was 4.35, 4.43, 3.53 and 3.58 in the Pearl River Delta region, and eastern, western, and northern Guangdong Province, respectively, and was 4.18, 5.44, 4.75, 3.24, 4.27 and 3.70 in residential areas, parks, construction sites, hospitals, waste collection stations, and other breeding habitats, respectively. Conclusions　The population density of adult Ae. albopictus peaked in Guangdong Province during the period between May and July from 2018 to 2023, with a high density of Ae. albopictus in the Pearl River Delta region and eastern Guangdong Province. Targeted Ae. albopictus control measures are recommended to be implemented prior to the peak of the Ae. albopictus population density to reduce the development of mosquito⁃borne infectious diseases.

Key words: Aedes albopictus, Population density, Mosquito ovitrap index, Seasonal fluctuation, Breeding habitat, Surveillance, Guangdong Province

摘要： 目的　了解2018—2023年广东省白纹伊蚊种群密度消长及不同地理片区、不同生境白纹伊蚊密度变化，为该省蚊媒传染病防控提供依据。方法　2018—2023年3—11月，在广东省21个地级市、121个区（县）、1 609个镇（街）设置白纹伊蚊监测点，每月在各监测点开展1次白纹伊蚊密度监测。每年12月至次年2月，在登革热多发的地市针对特定环境每月开展1次监测。各监测点按不同地理方位选择4个街道（村），在居民区、公园、医院、工地等环境的花园、天台或公共绿化带布放诱蚊诱卵器，回收后计算诱蚊诱卵指数（mosquito ovitrap index，MOI）。根据MOI值，将各监测点白纹伊蚊密度分成符合防控要求以及低、中、高风险4个等级，分析各年各监测点白纹伊蚊风险等级，并对不同月份、不同地理片区、不同生境白纹伊蚊密度进行分析。结果　2018—2023年，广东省21个地级市118 241个白纹伊蚊监测点中，白纹伊蚊密度符合防控要求的监测点占68.26%，低、中、高风险监测点分别占23.61%、6.67%和1.47%。广东省白纹伊蚊密度风险等级于每年4—5月快速升高，9—10月后逐步下降，峰值出现在5—7月。2018—2023年，广东省各白纹伊蚊监测点平均MOI值为4.21，各年分别为4.69、4.80、4.38、3.82、3.38、4.33，其中珠三角、粤东、粤西、粤北地区MOI值分别为4.35、4.43、3.53、3.58，居民区、公园、工地、医院、废品收购站及其他生境MOI值分别为4.18、5.44、4.75、3.24、4.27、3.70。结论　 2018—2023年，广东省白纹伊蚊成蚊密度峰值出现在5—7月，珠三角片区和粤东片区蚊密度较高。建议在蚊密度高峰期出现前及时采取有针对性的控制措施，减少蚊媒传染病发生。 

关键词: 白纹伊蚊, 种群密度, 诱蚊诱卵指数, 季节消长, 生境, 监测, 广东省