What’s the most effective approach to tackle disease-spreading mosquitoes? Surprisingly, it involves releasing more mosquitoes! This is the plan set forth by scientists part of Google’s Debug initiative. In their initial phase, they aim to introduce 16 million mosquitoes each in Florida and California, with plans to repeat this next year.
At first glance, increasing the mosquito population might seem counterproductive. However, understanding the types of mosquitoes involved is key to grasping the project. It’s really a case of distinguishing between beneficial and harmful mosquitoes.
Google’s ‘mosquito army’
The researchers intend to “breed sterile males and release them into the wild,” according to the Debug website. “When a wild female mates with a sterile male, her eggs won’t hatch. This leads to a shrinking population over generations.”
The male mosquitoes will carry bacteria known as Wolbachia, rendering them sterile.
In theory, this should accomplish two goals: Firstly, the next generation of mosquitoes would decline as female eggs go unfertilized. Secondly, there wouldn’t be more human bites, since male mosquitoes don’t bite at all.
Sorting male from female mosquitoes poses a challenge. To tackle this, the Debug researchers are working on “technologies that integrate sensors, algorithms, and innovative engineering to quickly and accurately differentiate males from females.”
But technology is just one hurdle. It’s not a matter of simply releasing millions of mosquitoes. Google has applied for a permit from the US Environmental Protection Agency, and they’re still awaiting a decision.
Targeting the Aedes aegypti mosquito
Interestingly, the Debug initiative isn’t focused on local mosquitoes in Florida or California. Instead, they aim to combat the Aedes aegypti, an invasive species that originated in Africa.
This mosquito is known for transmitting diseases like dengue, yellow fever, Zika virus, and chikungunya, which causes debilitating joint pain that can persist for lengthy periods.
Debug estimates that 40% of the global population is at risk from diseases carried by this mosquito, which has proliferated into tropical, subtropical, and temperate areas worldwide.
“Aedes aegypti is a very problematic mosquito,” explains Nathan Burkett-Cadena, an associate professor at the University of Florida’s Medical Entomology Laboratory.
Because it’s not a native species to Florida, there are no local predators that rely on it for food, as Burkett-Cadena noted in an email communication.
“If Google were to focus on native mosquito species, I would be concerned about potential environmental repercussions,” he added. But since Aedes aegypti doesn’t belong to Florida’s native fauna, this shouldn’t pose a risk.
Global efforts against mosquitoes
The World Mosquito Program, operated by Australia’s Monash University, is also battling disease-carrying mosquitoes around the globe. They, too, release mosquitoes that are infected with Wolbachia in 15 countries across Asia, Oceania, and the Americas.
Data from the World Mosquito Program shows that Wolbachia tends to be passed on through generations, effectively reducing the number of disease-carrying mosquitoes over the long term.
Crucially, they’re reporting that areas with high levels of Wolbachia have not experienced any dengue outbreaks.
This indicates that there is a feasible way to diminish the Aedes aegypti population.
Yet, the ethical implications remain. Should humans interfere with nature to such an extent? Is it right to reduce populations, even if they’re pests? Entomologists generally say ‘yes.’
“I ‘love’ mosquitoes,” Burkett-Cadena expressed. “Most species don’t harm humans and can actually be quite beautiful. However, in many cases, invasive mosquito species pose serious threats to human life, and those tasked with protecting us must act.”
