Biological and Physical Control

Biological Control
Biological control is the use of natural enemies to manage mosquito populations. There are several types of biological control including the direct introduction of parasites, pathogens and predators to target mosquitoes. The Placer Mosquito and Vector Control District employs mosquitofish (Gambusia affinis), a predatory fish that feeds on mosquito larvae.

Most of the mosquitofish we use are produced at our facility. We are able to produce approximately 130 pounds of fish on an annual basis. In the event that our in-house supply does not meet the needs of our residents, we are able to obtain fish from neighboring districts or harvest them from the wild.

To learn more about mosquitofish, please visit our Mosquitofish page.

Physical Control
The physical control aspect of our Integrated Vector Management program works to eliminate mosquito development sites. This method can be used to reduce larval mosquito sources as well as adult mosquito habitats. When this method is effective, it greatly reduces or eliminates the need to use other methods of control.

Since many mosquitoes develop in standing water, larval source reduction can be as simple as emptying water from containers around the home. This is something that homeowners can accomplish. For example, homeowners can eliminate mosquito breeding grounds by removing unused plastic pools, old tires, or buckets; by clearing clogged gutters and repairing leaks around faucets; by regularly changing water in bird baths; and by filling or draining puddles, swampy areas, and tree stumps.

Our program works with landowners and land managers to limit standing water, manage emergent vegetation, and maintain ditches and natural drains. We also work with our agricultural partners to coordinate irrigation and mosquito treatments.