
Source: County of San Diego
July 7, 2025 (La Mesa) -- To protect the public and keep mosquitoes from potentially spreading West Nile virus, which was recently detected in Rolando, the County is scheduled to conduct ultra-low volume, truck-mounted, pesticide-mist treatments this week. The spraying aims to reduce the number of adult mosquitoes on about 4,000 parcels in the community of Rolando, which includes parts in San Diego and La Mesa.
The treatments are scheduled to take place from 1 a.m. to 6 a.m. from Wednesday, July 9 through Friday, July 11, depending on conditions.
While the treatments pose a low risk to people and pets and the pesticide dissipates in roughly 20 to 30 minutes, residents may wish—as a precaution—to stay inside, keep pets and pet bowls inside, and close windows during the treatment.
More information, including a map of the treatment area, frequently asked questions, and contact information for Vector Control, can be found on Vector Control’s Adult Mosquito Control Information webpage.
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