Mosquitoes Becoming Immune To DEET, Study Suggests

by Sean McLachlan on


According to a new study, mosquitoes are learning to ignore DEET, the BBC reports.

Researchers at the London School of Hygiene and Tropical Medicine tested the responses to DEET by the Aedes aegypti, a type of mosquito that can carry yellow fever and dengue fever and is thus particularly dangerous to adventure travelers.

In a new study published in the journal PLOS ONE, researchers say that while mosquitoes are at first repelled by DEET’s smell, they soon become accustomed to it and can return bite the wearer. Electrodes attached to the insects’ antennae show that they adjust to the scent of DEET and simply stop smelling it.

This is something I’ve heard campers and hikers comment on for quite some time now. Spending time in mosquito-ridden Missouri, I’ve noticed this trend myself. Missouri has about 55 known types of mosquito, including the Aedes aegypti.

An earlier study has raised questions about DEET being a neurotoxin. It looks like science’s next task is to find a better insect repellent.

I’ve also noticed that mosquito coils, which do not have DEET as an active ingredient, no longer seem to work on Missouri mosquitoes either. I enjoy sitting on the porch swing of my friend’s house reading. It used to be that a burning coil set nearby would keep the bugs away. No more. The last time I tried it the little bastards were attacking me so much I actually put the coil under the porch swing so the smoke rose right onto me. The mosquitoes didn’t seem to care. I soon retreated inside.

[Photo of Aedes aegypti courtesy US Department of Agriculture]

Name a cockroach after your lover: Valentine’s Day at the Bronx Zoo

by Sean McLachlan on

The Bronx Zoo has come up with a good way to show that special someone you care–name a giant cockroach after them.

The BBC reports that for ten bucks you can buy the rights to one of the zoo’s 58,000 giant Madagascar Hissing Cockroaches and name it after that special someone who bugs you more than anybody else. The zoo says they sold 1,000 dedications in the first day of the promotion. Perhaps their tagline helped: “Flowers wilt. Chocolates melt. Roaches are forever.”

Indeed they are. They’ve been around since before the dinosaurs and they’ll probably be around after we’re long gone. The Bronx Zoo has some interesting facts about the Madagascar Hissing Cockroach, like that they can grow to three inches long and the hiss they make can be as loud as a lawnmower.

They’re nutritious too. Check out our 8 bug-eating videos including two on eating cockroachs. Also check out the far less disgusting but much more educational the video below.

[Photo courtesy user Husond via Wikimedia Commons]