By Donna Durckel, County of San Diego Communications Office
Mar. 18, 2026 | 2:13 PM
Reading Time: 2 minutes
San Diego County Vector Control will begin its first routine aerial larvicide drop of the year on March 24, focusing on up to 50 local waterways where mosquitos commonly breed.
The treatments happen monthly through October at sites throughout the region. The larvicide used is a solid, granular product that is safe for people, pets and wildlife but effective at controlling mosquito larvae before they can grow into biting mosquitoes.
The County has used helicopters for these efforts since the early 2000s, when West Nile virus first appeared in the region. While West Nile is primarily a bird disease, it can spread to people….
