The community-wide effectiveness of municipal larval control programs for West Nile virus risk reduction in Connecticut, USA

Joseph McMillan, Christina Harden, James Burtis, Mallery Breban, John Shepard, Tanya Petruff, Michael Misencik, Angela Bransfield, Joseph Poggi, Laura Harrington, Theodore Andreadis, Philip Armstrong

Research output: Contribution to journalArticlepeer-review

Abstract

ACKGROUNDMosquito larval control through the use of insecticides is the most common strategy for suppressing West Nile virus (WNV) vector populations in Connecticut (CT), USA. To evaluate the ability of larval control to reduce entomological risk metrics associated with WNV, we performed WNV surveillance and assessments of municipal larvicide application programs in Milford and Stratford, CT in 2019 and 2020. Each town treated catch basins and nonbasin habitats (Milford only) with biopesticide products during both WNV transmission seasons. Adult mosquitoes were collected weekly with gravid and CO<sub>2</sub>-baited light traps and tested for WNV; larvae and pupae were sampled weekly from basins within 500 m of trapping sites, and <i>Culex pipiens</i> larval mortality was determined with laboratory bioassays of catch basin water samples.<br>RESULTSDeclines in 4th instar larvae and pupae were observed in catch basins up to 2-week post-treatment, and we detected a positive relationship b
Original languageEnglish
JournalPest Management Science
DOIs
StatePublished - Jul 16 2021

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