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There are invasive daytime-biting, black-and-white mosquitoes in LA County. Do I have to worry?

Mosquitoes and cities go hand-in-hand. Even during the winter, we're experiencing an invasion of new species of mosquitoes. Now we have another type of mosquitoes to fight: Asian tiger mosquito, Australian backyard mosquito and yellow fever mosquito. Currently, the mosquitoes aren't a public health threat. However, the presence of these daytime-biting mosquitoes increases the threat of new diseases to emerge in your community.

Mosquitoes need stagnant water, but there's been no rain. Where are they laying their eggs?

The lack of rain has certainly helped in decreased mosquito populations in certain areas. However, people use water around their properties, which can lead to stagnant water in containers and around the yard. The invasive mosquitoes can lay eggs along the water line of these containers, which means dumping and draining water is no longer 100% effective. Some common types of containers we find are buckets, plant saucers, tires, recyclables and trash. In addition, these eggs can survive for many years without water.

What Makes Them so Dangerous?

The Asian tiger mosquito, Australian backyard mosquito and yellow fever mosquito are new threats to residents in LA County. Several things have vector control officials worried:

• They are aggressive daytime biters. You heard right. In broad daylight, they will actively feed on adults and children.

• Two of the mosquitoes (yellow fever mosquito and Asian tiger mosquito) can transmit dengue fever, yellow fever and chikungunya. They are all very debilitating diseases. Fortunately, the viruses aren't actively transmitting in LA County. However, if an infected traveler visiting SoCal were bit by one of the mosquitoes, it can potentially cause an outbreak.

• They are container breeders. This means they lay eggs individually along the edge of stagnant water in anything that can hold water. This includes tires, buckets, saucers and even toys. In addition, the yellow fever mosquito can thrive indoors. This means office workers, people in homes are at risk.

In the News: See the official press release HERE.

What can I do to Protect Myself?

• Dump and drain all stagnant water.

• Wear insect repellent. Repellent containing DEET, Picaridin, IR3535 and Oil of Lemon Eucalyptus are considered effective.

• REPORT any daytime biting or if you spot black-and-white striped mosquitoes. REPORT MOSQUITOES HERE

What We are Doing to Protect You

• Scientific-Technical Services: The staff of Vector Ecologists perform surveillance and monitor mosquito activities. Read more about what they do HERE.

• Operations: Vector Control Specialists are in your community controlling mosquitoes, midges and black flies. Read more about what they do HERE.


• Community Outreach: The Education Program Coordinators and Public Information Officer promote public awareness of District services, and educates the public about vectors, vector-borne diseases, and other vector control issues. Read more about what they do HERE.

• Providing Prompt Alerts: Sign up for our e-alerts HERE, which includes our Buzzword newsletter and press releases. Be informed, stay safe!

Receive Alerts

• Virus Activity Reporting: We believe a healthy and safe community should have access to public health information. That is why we provide you past and present virus activity. You can see it HERE.

What would you like to learn about?

District Programs

There are a number of Mosquito Species and Mosquito-Borne Diseases known to occur within the Greater Los Angeles County Vector Control District.

Click here to learn more.