Fig. 1: Field sites, mosquito baseline density, and weather data.

a Annual number of dengue cases reported in Hunan Province from 2010 to 2019. Breteau Index in Changsha, Hunan in 2018 (b) and 2019 (c) provided by the Hunan CDC. The red dotted line represents the predicted Breteau Index threshold level of 20 with a high risk for dengue transmission according to the guidelines from the China CDC. The data of dengue cases reported in Hunan Province from 2010-2019 and Aedes data were obtained from the Chinese National Notifiable Infectious Disease Reporting Information System (CNNDS) and the National Bureau of Statistics of China by request, respectively, which are presented in the Supplementary Data 1. d The control, release and buffer sites are shaded yellow, purple, and blue, respectively, for the urban areas located in Furong District of Changsha. e The distribution of adult BG traps and ovitraps at the release, buffer and control sites. BG shows the BG traps. T, B, and C represent the ovitraps located at the release, buffer, and control sites, respectively. f Satellite images for the control, release and buffer sites. g Total amount of precipitation weekly in Furong district of Changsha from June 21, 2020, to November 22, 2020 is presented as the red line scaled according to the left y-axis. The average number of females per trap per 24 h is presented at the control (blue line) and release sites (green line). The 95% confidence interval of female number at control (blue shading) and release sites (green shading) are scaled according to the right y-axis (n = 30 independent trap samples per collection day from June 21, 2020, to November 22, 2020). The total precipitation in the prior week has correlation with average number of females per trap at control site (Pearson correlation: r = 0.4871, weekly total precipitation: n = 20, control site: n = 20, P = 0.0294) but has no correlation with the average number of females per trap in release site (Pearson correlation: r = 0.4625, weekly total precipitation: n = 18, release site: n = 18, P = 0.0553). h The weekly temperature at Changsha from June 21, 2020, to November 22, 2020 is indicated as the orange line with weekly mean minimum and maximum temperatures in Celsius shaded in light orange. The temperature and precipitation data of Furong district in the past 24 h were recorded every day at 16:00 from Weather app (data source: The Weather Channel, https://weather.com).