A highly-targeted approach for the control of yellow fever mosquito infestations in Southern California.

Vector control will release non-biting, male yellow fever mosquitoes (Aedes aegypti) in a localized area of East Los Angeles. These male mosquitoes are dusted with a small amount of an insect growth regulator (IGR) called pyriproxyfen, which prevents mosquito larvae from maturing to adults.

The released males will mate with wild female yellow fever mosquitoes in the infestation zone and transfer some of the dust to the female in the process. When the treated female lays her eggs in water-holding containers, she deposits some of the dust into the water. Larvae will hatch from the eggs, but the offspring will not survive.

Dusted male mosquitoes will also transfer the IGR to water sources they visit. This pilot program will determine how effective this novel strategy will be in the District’s overall Invasive Aedes Mosquito Control Strategy.

Learn more about pyroproxyfen HERE

Yellow fever mosquitoes have taken broad hold in an increasing number of neighborhoods in Los Angeles County since they were first detected in 2014. Despite intensive traditional mosquito control efforts, they have continued to spread.

As the infestation expands and mosquito numbers increase, the risk for local disease outbreaks of Zika, chikungunya, dengue, and yellow fever, is also elevated.

Male mosquitoes do not bite.

These males carry a tiny amount of the IGR, which specifically targets the immature mosquito larvae, preventing their survival to adulthood. It has low environmental impact, has very low to no mammalian toxicity and is approved by the Food and Agriculture Organization/World Health Organization for use in drinking water.

This technique has been used in other countries, and more recently in Kentucky and Northern California with good success.

The dusted males are “self-delivering,” which means they will seek out the female yellow fever mosquitoes. This is beneficial because the males are very effective at locating females and females in turn at locating breeding sources, thus resulting in a much more targeted application then traditional treatment options. This control approach promises to be highly effective.

The CA Department of Pesticide Regulation (DPR) and U.S. Environmental Protection Agency (EPA) are overseeing this program.

Many questions about this pilot program can be answered on our Frequently Asked Questions page HERE.

Download the PDF of the Targeted Yellow Fever Mosquito Control Fact Sheet HERE.

Click here to read the Program Overview