The World Cup game between England and Tunisia was a bloodbath – at least for some happy mosquitoes. And while there are various options for keeping these bugs out of our stadiums (and yards), only one of them is good.
For a mosquito, there must be nothing sweeter, more enticing, more paradisiacal, than the smell of a nearby sports stadium.
With up to 45,000 people packed inside (at least in the case of the Volgograd arena in Russia), it’d be a bit like catching a whiff of the world’s largest barbecue, a place where cooks had gathered to roast 45,000 separate meals, some on the spit, some on the grill.
For mosquitoes, the “smoke” in the case would be the CO2 exhaled by spectators as they watched the game. Mosquitoes have receptors for CO2, meaning they “smell” it to some degree. Fans at the match, due to stress and excitement, would be breathing more rapidly than the human average of 15 times per minute, so there’d be even more CO2 than usual. And if a 2010 French study is any clue (link below), the fans drinking alcohol would draw up to 30 percent more mosquitoes to boot.
This entire “chimney” of chemical smoke would then envelope the stadium in a fog of CO2 and other sports-related chemicals that, to mosquitoes, might as well be a flickering neon sign. Or at least to the females, anyhow – they’re the ones that need the blood and protein to make their eggs. (Males are vegetarians, living off nectar from plants.)
All of which may explain the recent sight of a few dozen World Cup footballers from Tunisia and England swatting and slapping and dousing themselves with insect repellant. To those at home it was a slight distraction. But for the players it was a very real nuisance.
So what can authorities do about it?
Can’t drain this swamp
One option that comes to mind would be to take insect repellant, similar to the kind that players were drenching themselves in, and create a “ring of death” around the stadium in question.
But Martin Husemann, who heads the entomology department at the University of Hamburg, says he isn’t a fan of that idea.
“I would not recommend large-scale spraying because of ecological problems,” he told DW. “The risks may be higher than the benefits.”
And in any case, that’s just not the plan for the Lower Volga region of Russia. The wetlands there, parts of which are just across the river from the stadium, are protected. They’re also a perfect breeding ground for mosquitoes and other flies. Global warming is adding to this misery (at least for humans), filling the air with more heat and moisture and resulting in longer mosquito breeding seasons.
Another question that comes to mind is whether ultrasound devices that use audio to repel certain kinds of bugs (and which are available for 20 euros or so online) could be installed in or around a stadium. The frequencies would be silent to humans, but perhaps intolerably loud to bugs?
“The opinions are a little split, but the tendency [is to say] they do not work,” Husemann says.
For more read the full of article at The Dw
