Adult Mosquito Control Information
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About
The Vector Control Program (VCP) monitors mosquito-related public health risks throughout the County. If an elevated public health risk exists that cannot be reduced by other means, such as eliminating mosquito breeding or preventing larval growth, then the VCP may use adult mosquito control treatments to reduce the number of infected adult mosquitoes.
Depending on the situation, these adulticides may be applied with hand-held, backpack, portable, and/or truck mounted equipment by skilled vector control technicians certified by the California Department of Public Health. Larvicides may also be used in situations where mosquito breeding is detected.
There are currently no scheduled adult mosquito treatments.
2026 Treatments
| Application Date | Location | Time | Product | Reason |
|---|---|---|---|---|
| 9/25/2026 & 9/26/2026 | Coronado | 1:00 a.m.to 6:00 a.m. | AquaDuet | West Nile Virus |
Mosquito Control Treatment Map
You can use the map below to view active treatment areas. Click on the treatment area to see additional details. Type your address into the map search bar to see if your property falls within the treatment area.
The products we use in adult mosquito treatments have been evaluated by the Environmental Protection Agency for safety and will not harm people or pets.
It is not necessary to stay inside or close doors and windows during the treatment, but residents may feel more comfortable doing so. When applied as an ultra-low volume spray, the droplets will disappear quickly and should be gone within 30 minutes.
Residents with outdoor fishponds or bee hives should cover them during the treatment.
The treatment will not affect swimming pools or the paint on cars.
Additional optional precautions may include:
- Keep pets indoors during spraying. Wash any pet food and water bowls that were left outside during the treatment
- Wash homegrown fruits and vegetables with water as you would typically do before cooking or eating them
- Wait 30 minutes after the treatment before going outside
- Wipe down or cover outdoor items such as toys and barbecue grills
Our team regularly traps mosquitoes and tests them for diseases like West Nile virus, dengue, and Zika. If our analysis of this information shows that there is an elevated risk to public health in a certain area, we will consider using adult mosquito control products.
This decision making process is described in our Mosquito-borne Pathogen Strategic Response Plan which is based on State guidelines and peer reviewed research.
The Vector Control Program uses an integrated vector management approach. Adult mosquito treatments are always accompanied by efforts to find and control sources of mosquito breeding in the neighborhood and to educate the public about mosquito prevention. You can learn more about how the Vector Control Program controls young mosquitoes in standing water here.
At least 24 hours prior to treatment, we will post signs throughout the area we plan to treat. We may also use press releases, social media, emails, and text messages to inform residents of the treatment area. Up to date details about any scheduled adult mosquito treatment can be found on our website here or by calling the County of San Diego Vector Control Program at (858) 694-2888.
You can also sign up for email updates from the Vector Control Program here.
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