title: Evaluation of Culex pipiens Populations in a Residential Area with a High Density of Catch Basins in a Suburb of Chicago, Illinois.
abstract: The North Shore Mosquito Abatement District applies extended release larvicides including methoprene-based Altosid® XR Extended Residual Briquets to approximately 40,000 catch basins in the southern half of the District's operational area at the beginning of each season. Treatments begin in May and typically again 9 to 10 wk later when larvicide efficacy appears to wane. In 2013 spinosad-based Natular™ XRT tablets were applied to basins, and a subset were monitored for larvae and pupae weekly with a standard dipper. When setting the threshold for retreatment as 12 juveniles per dip sample it was observed that basins required a second application 9 wk after the initial application, a time period similar to Altosid despite utilizing a different active ingredient. Average counts of weekly larval samples appeared to be positively associated with average numbers of Culex pipiens collected the following week in a gravid trap located among catch basins, highlighting the importance of basins as sources of these mosquitoes.
authors.affiliation: 1  Division of Epidemiology, Department of Public Health Sciences, Loyola University Medical Center, 2160 S First Avenue, Maywood, IL 60153.
authors.forename: Justin E
authors.initials: JE
authors.lastname: Harbison
authors.forename: Marlon
authors.initials: M
authors.lastname: Henry
authors.forename: Christopher
authors.initials: C
authors.lastname: Xamplas
authors.forename: Lara R
authors.initials: LR
authors.lastname: Dugas
mesh_terms: D063147:Animal Distribution; D000818:Animals; D002641:Chicago; D003465:Culex / Q000254:growth & development / Q000502:physiology; D004338:Drug Combinations; D007306:Insecticides; D007814:Larva / Q000254:growth & development / Q000502:physiology; D018942:Macrolides; D009032:Mosquito Control / Q000379:methods; D011679:Pupa / Q000254:growth & development / Q000502:physiology; D012621:Seasons
chemical_list: D004338:Drug Combinations; D007306:Insecticides; D018942:Macrolides; C415329:spinosad
keywords: Larvicide; West Nile virus; catch basin; mosquitoes