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Vector Control - Larvicide Application


Last updated 5/11/2017 at 8:08am

The County of San Diego Vector Control Program (VCP) will conduct its second helicopter-application of mosquito larvicide of the 2017 mosquito season to waterbodies known to breed mosquitoes on Wednesday, May 17, 2017.

The larvicide is made of granules (not a spray) of naturally occurring bacteria which reduce mosquito larvae in the water and is safe for people, pets, fish and other insects. There is no aerosol drift of the granules. The larvicide decreases mosquitoes including those that may spread West Nile virus. VCP staff will be at the locations during the application to answer questions and monitor progress.

Additional helicopter larvicide applications will be conducted at three to four week intervals or as needed throughout the mosquito season which typically ends in October. Mosquito populations throughout the county are monitored and tested for the presence of West Nile virus and other mosquito-borne diseases. This larvicide application has been performed by the VCP for over 10 years to reduce mosquitoes and the spread of West Nile virus.

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