Invasive Mosquito Species & Their Diseases

Rapid international travel and trade results in the importation of both pathogens and vectors not found in California. The Asian tiger mosquito, Aedes albopictus and the yellow fever mosquito, Aedes aegypti, for example, has been introduced into North America in used vehicle tires, and has become established in some areas of southern California. These species can develop in  artificial containers in warmer areas. Currently both species are establish in some areas of southern California. The Aedes aegypti is establish in Fresno, Clovis, Madera County and in 2017, Merced County. See map for up to date information.

For more information on invasive Aedes, a.k.a. daytime biting mosquitoes, click here.

This species are efficient vector of the Zikadenguechikungunya virus and yellow fever. Other potential diseases of concern include Japanese encephalitis, Rift Valley fever, Venezuelan encephalitis and malaria. Report daytime biting mosquitoes to the District at (209) 982-4675.


Aedes aegypti or Yellow Fever mosquito is a small, dark mosquito with stripes forming a harp shape on the mid-body (thorax) and white banded legs. Aegypti usually will approach low and behind a person, often biting people's ankles and elbow areas.


Aedes albopictus or Asian Tiger Mosquito is a small black mosquito with bright white stripe on the front of the mid-body (thorax) and bright white banded legs. This mosquito is an aggressive, rapid daytime biter.

For in depth information on these mosquito-borne diseases, please see the following links:

California Department of Public Health - Zika

Centers for Disease Control and Prevention - Zika

* References from: The Biology and Control of Mosquitoes in California. 1996. Mosquito and Vector Control Association of California. Elk Grove, CA., CDPH and Best Management Practices for Mosquito Control in California, 2012, CDPH


West Nile Virus and
Dead Bird Hotline

(877) 968-BIRD (2473)

or online at westnile.ca.gov


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