East County News Service
March 18, 2026 (San Diego County) -- Helicopters will soon become a familiar sound over San Diego County wetlands as San Diego County Vector Control begins its first routine aerial larvicide drop of the year on March 24.
Vector Control is focusing on up to 50 local waterways where mosquitos commonly breed. The treatments happen monthly through October at sites across the county. The larvicide used is a solid, granular product that is safe for people, pets and wildlife but is also effective at controlling mosquito larvae before they can grow into biting mosquitoes.
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