Larviciding of public standing water areas and the treatment of storm water catch basins have been completed in Toronto for the 2011 West Nile virus (WNV) season. At this time of year any emerging mosquitoes are going into diapauses, a hibernation-like state of development that allows them to survive through the winter and would not play a significant role in human health risk to WNV.

Toronto Public Health Vector Borne Diseases Program (VBD) uses a strategic and targeted approach to larvicide application that is based upon WNV surveillance findings. The VBD program performs mosquito control activities typically from June to October, under the authority of Toronto's Medical Officer of Health.

In 2011, Toronto Public Health (TPH) identified mosquito breeding sites and where appropriate mosquito larvicide was applied by licensed contractors to storm water catch basins and seasonal standing water areas.

The larvicide application is a preventive measure consistent with WNV prevention and control recommendations from the Province of Ontario and TPH.

The following larvicide was applied by licensed applicators or trained technicians approved by the Ontario Ministry of the Environment:

Last updated October 2011