Aerial Mosquito Larvicide Applications

To better protect our communities and the environment, the Vector Control Program (VCP) applies mosquito larvicide via helicopter to mosquito breeding areas that cannot be treated by hand. These aerial applications occur every three to four weeks during the mosquito breeding season, generally April to October, or as needed.

The granular larvicides used by the Vector Control Program act specifically on mosquito larvae and will not harm people, pets, plants, or wildlife. The larvicide consists of granules containing Bacillus sphaericus, Bacillus thuringiensis israelensis, and/or Saccharopolyspora spinosa products. These naturally occurring bacteria target mosquito larvae and prevent them from developing into biting adults.

Larvicide information

Aerial Larvicide Fact Sheet

• April 29 and 30, 2020
• May 27 and 28, 2020
• June 17 and 18, 2020
• July 8 and 9, 2020
• July 29 and 30, 2020
• August 19 and 20, 2020
• September 9 and 10, 2020
• September 30, 2020 

Please note, aerial larvicide application dates are subject to change depending on mosquito trap counts. If counts are high, larvicide will be applied every three weeks. If counts are moderate, larvicide will be applied every four weeks. If counts are low, larvicide will not be applied.

If you would like to sign up to receive e-mail announcements of scheduled aerial applications, please click on the link: E-Gov Delivery Notice Subscription and subscribe to Aerial Mosquito Larvicides Application, Countywide under Environmental Health.

Aerial Larvicide Application Locations

Total: 48 locations & approx. 1035.45 acres

Questions?

  (858) 694-2888

  vector@sdcounty.ca.gov