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Aerial Spraying

Aerial spraying for the control of nuisance mosquitoes is used in Miami-Dade County when mosquito trap counts exceed acceptable levels and when there is an increased number of complaint calls from residents reporting mosquitoes as a nuisance.  These aerial spray treatments target the Aedes taeniorhynchus (black salt marsh mosquito).  This species is not a vector for disease; however, it is an aggressive biter and can create a significant nuisance to residents and create a diminished quality of life for residents living where there are infestations.

According to the U.S. Centers for Disease Control, aerial spraying using the pesticide naled, is a safe, quick and efficient method for mosquito control.  Naled is an EPA-registered pesticide which has been used for aerial spraying by Miami-Dade County for more than forty years to successfully control adult black salt marsh mosquitoes in populated areas.  Mosquito control programs throughout the United States and in neighboring counties and districts in Florida also use naled as part of their integrated vector control programs. 

Miami-Dade County used aerial spraying during the 2016 response to local transmission of Zika to help control the Aedes aegypti mosquito population in Miami Beach and the Wynwood area north of downtown Miami.  Aerial treatments using naled, in conjunction with aerial and truck Bti larvicide treatments, allowed Mosquito Control to successfully break the cycle of local Zika transmission. 

When aerial treatments are necessary, Mosquito Control uses a very small amount of naled, between a half ounce to one ounce per acre (about the size of a football field), depending on the species. According to both, the Environmental Protection Agency (EPA) and the Centers for Disease Control and Prevention (CDC): “This small amount does not pose a health risk to people or pets in the area that is sprayed.”

Additional information about naled and the effectiveness of aerial spraying, insecticides used, and simple precautions you can take when aerial spraying occurs, are available from the EPA and the CDC.

2017 Mosquito Season

Miami-Dade County completed aerial spraying on Monday, July 3. 

Miami-Dade County completed aerial spraying for mosquitoes on Friday, June 16. 

Canceled Spray Missions:  The aerial spray missions scheduled for May 16 and June 15 were canceled due to poor weather conditions.

2016 Mosquito Season 

Miami-Dade County used aerial spraying during the 2016 mosquito season to help control the mosquito population in Miami Beach and the Wynwood area north of downtown Miami. These areas were identified by the Florida Department of Health as areas with confirmed cases of locally transmitted Zika. Wynwood and Miami Beach are no longer considered areas of active transmission. 

Truck Spraying

Miami-Dade County performs ground spray treatments to eliminate mosquito larvae and adult mosquitoes.

Larvicide treatments are conducted using truck mounted equipment to apply the organic pesticide Bti (Bacillus thuringiensis israelensis), which eliminates mosquitoes in the larval stage.

According to the Environmental Protection Agency (EPA) and the U.S. Centers for Disease Control (CDC), Bti is non-toxic to humans, pets, and animals, is a naturally-occurring bacterium found in soils, and has been used in mosquito control for more than 30 years. It is very effective when used as part of an integrated mosquito management program. It is also commercially available in granules and dunks, as well as tablets, pellets, briquettes and in liquid form.    

Larvicide truck treatments are typically performed overnight in the pre-dawn hours. Adulticide treatments are performed at dawn or dusk when adult mosquitoes are most active. Every effort is made to avoid exposing residents to pesticide applications.  

Additional information and frequently asked questions about Bti are available from the EPA and the CDC.

Truck adulticiding takes place when surveillance data reflects an elevated number of mosquitoes in a specific area, the extent of the area that needs to be sprayed, or whether an isolated portion needs to be treated.  Organophosphate and pyrethroid pesticides are applied as ultra-low volume (ULV) sprays which dispense very fine aerosol droplets that kill flying mosquitoes on contact.

The EPA provides additional information on pesticides used for truck adulticiding. 

Back to Top Page Last Edited: Thu Aug 10, 2017 3:03:05 PM

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