There are about 27 different types of mosquitoest in San Diego County, at least 9 of which can carry diseases that can be spread to humans. Native Culex mosquitoes can spread West Nile virus and tend to bite during dusk and dawn. Invasive Aedes mosquitoes bite during the day and can transmit Zika, dengue, yellow fever, and chikungunya viruses. All mosquitoes lay their eggs in or near standing water. Finding, dumping, and treating standing water is the best way to control mosquito problems. 













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