Science & Technology



The 'perfect droplet': A new mosquito-spraying method aims to stop them from multiplying

Lisa J. Huriash, South Florida Sun Sentinel on

Published in Science & Technology News

If Broward’s mindset was to find a better way to spray and defeat mosquitoes, then it’s marking a milestone in the skeeter battle.

After about a year of tinkering and refining plans, a team of county engineers, as well as mechanics, created a system to reduce liquid mosquito spray into particles — to reach the “perfect droplet size.”

The atomizer breaks the spray into the right-sized pieces to help them go farther. The droplets can’t be too large or they would fall to the ground, and they can’t be too small or they would travel too far once they hit the wind and take too long to reach their destination, making them less effective.

“When I see something we do is beneficial to the community, that’s what pushes me forward,” said Adriana Toro, the assistant director of the Broward’s Highway & Bridge Maintenance Division, who dreamed up the invention in 2016 when there was widespread concern about the Zika virus. Toro is a materials engineer and civil engineer and used her expertise to fight the mosquito-causing calamity.

The spray now has a better chance of breezing through the air to go over fences, under trees and into rooftop gutters, all the places where the dangerous breed of mosquitoes called Aedes (a Greek word that means unpleasant) aegypti lay their eggs. It’s the predominant type of mosquito in South Florida and a vector of several viruses including yellow fever virus, dengue virus, chikungunya, and Zika virus.

Securing a patent


Their invention, which sits on the back of a pickup, with a large tank of the larvae spray, was granted a patent by the U.S. Patent and Trademark Office in August. It is called the “System, Method and an Apparatus for Spraying Insect Control Substances.”

“It’s not a cool name,” admits Anh Ton, director of Broward’s Highway & Bridge Maintenance Division, a division of the county’s Public Works Department, which oversees its Mosquito Control Division.

The county now has three of the machines and it hits the streets when workers identify a high concentration in an area using mosquito traps that are discreetly placed in backyards, with permission.

The U.S. Centers for Disease Control and Prevention call mosquitoes the “world’s deadliest animal” because the diseases they transmit are responsible for more than 700,000 deaths worldwide every year.


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