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Mosquitoes can transmit a variety of diseases and parasites to people and animals in Placer County, including West Nile Virus, Western Equine encephalomyelitis virus, dog heartworm, St. Louis encephalitis, and malaria.
See more information about mosquitoes on our Mosquito Facts page.
Adult female mosquitoes acquire disease by feeding on infected animals such as birds or rodents. Bites from infected mosquitoes transmit diseases to people and animals. There are approximately 3,500 species of mosquitoes worldwide, with 53 different species in California and over 30 species in Placer County.
See more information about the mosquitoes of Placer County on our Mosquitoes of Placer County page.
Mosquitoes need water to develop The first three stages of the mosquito life cycle are spent in the water. You can prevent mosquitoes from developing by removing or draining standing water that support this life cycle. In warm temperatures, mosquitoes can develop in as little as three days!
Click to download our brochure: About Mosquitoes
Common Mosquito Issues in Placer County
Anopheles freeborni
Residents who live in western Placer County are most likely to encounter the Western Malaria Mosquito, Anopheles freeborni. This mosquito emerges from hibernation in the early spring, when weather conditions warm up. It may also emerge during warm spells in the winter. Western Placer County residents also see another peak in Anopheles activity in the late summer and early fall, when these mosquitoes have completed their reproductive cycle and are preparing to hibernate for the winter.
For more information on the Western Malaria Mosquito, click to download our brochure: Anopheles freeborni.
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