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Vector Control

Vector Control

142 - Investigating Culex pipiens and Culex tarsalis activity patterns to determine optimal application times for adult mosquito control interventions

Wednesday, March 5, 2025
2:15 PM – 2:25 PM AST
Location: 209
Abstract: Sacramento-Yolo Mosquito and Vector Control District utilizes ground and air based ultra-low volume space sprays to control adult mosquitoes in response to elevated West Nile virus activity in Culex tarsalis and Cx. pipiens. Rural and agricultural applications are generally applied by air. Biogents counter (BG-C) traps have provided useful data on Cx. tarsalis activity patterns in rural spaces and BG-C data is routinely used to plan mosquito control application for peak activity periods. However, in Sacramento and Yolo Counties BG-C traps are less effective in urban spaces and cannot be used to provide real-time data on the activity patterns of Cx. pipiens and Cx. tarsalis. More mosquito activity data was needed from urban spaces to better understand when targeted mosquitoes were active in these spaces. During 2024 a time-segregated trapping campaign was conducted in both urban and rural spaces of Sacramento County. The goal of the study was to determine whether mosquito activity patterns varied by species and/or land use type. The results of the study and implications for timing of ULV applications will be presented and discussed.