They already have evolved resistance to the chemicals we use to kill them, hence the resurgence.
Edit: from todays Morningbrew:
It’s possible that France really is suffering from a bedbug epidemic. The critters have been making a comeback globally in recent decades after being nearly eradicated in the 1950s using pesticides. Bedbugs have since developed a resistance to these chemicals, and high levels of international travel also haven’t helped.
However, French exterminators are saying that the public might be overreacting.
The creator of the pest control website badbugs.fr told the BBC that 75% of bedbug inquiries his company receives are false alarms.
Normandy-based pest controller Romain Morzaderc explained to the Ouest-France newspaper that in 99% of cases, other “nasty black insects” get mistaken for bedbugs.
There’s also the fact that we quit using DDT in most of our insecticides and DDT was great at killing bed bugs it just was also cancer causing in humans.
But the main reason why it’s boom time for bedbugs, according to the review, is that they’ve evolved resistance to many pesticides, our main line of defense. Indeed, these critters are now resistant to “most of the major classes of insecticides,” the review states, including pyrethroids, which is still one of the most commonly used insecticides. They’ve also developed resistance to DDT, which attacks insects in a similar way to pyrethroids.
They already have evolved resistance to the chemicals we use to kill them, hence the resurgence.
Edit: from todays Morningbrew:
It’s possible that France really is suffering from a bedbug epidemic. The critters have been making a comeback globally in recent decades after being nearly eradicated in the 1950s using pesticides. Bedbugs have since developed a resistance to these chemicals, and high levels of international travel also haven’t helped.
However, French exterminators are saying that the public might be overreacting.
The creator of the pest control website badbugs.fr told the BBC that 75% of bedbug inquiries his company receives are false alarms. Normandy-based pest controller Romain Morzaderc explained to the Ouest-France newspaper that in 99% of cases, other “nasty black insects” get mistaken for bedbugs.
There’s also the fact that we quit using DDT in most of our insecticides and DDT was great at killing bed bugs it just was also cancer causing in humans.
FTA:
Not even that would save us, FWIW.
https://www.morningbrew.com/daily/stories/2023/10/13/have-bedbugs-taken-over-paris