“Ever wondered why flies attack you in August?” They’re everywhere all summer, but one secret invader turns them from harmless to painful 🪰😳 Discover the real biting culprit in the article 👇
It’s something many of us have noticed but never questioned—flies are always around, but come August, they suddenly seem more aggressive. What’s going on with them?
Let’s start by understanding the usual fly that shares our home.
Meet the Common Housefly
The housefly (Musca domestica) is exactly what it sounds like—a fly that lives in houses. Originally from the grasslands of Central Asia, it has followed humans across the globe and can now be found on every continent, in all types of climates, whether in cities or villages.
Why wouldn’t it thrive? Its ideal temperature is around 23–25°C, which makes our homes the perfect environment.
A Fly That Eats (and Breeds) Fast
Houseflies are not picky eaters. While they’re technically omnivores, they only consume liquid food. A drop of jam, a bit of defrosted meat juice, spilled milk—this is a feast for them.
They breed fast. From egg to adult fly, the process takes anywhere from two weeks to a month. Their larvae grow in rotting food waste, and the adult flies live around two to four weeks—sometimes even longer.
Here’s the twist: fertilized females can survive winter by going into a kind of hibernation in cold places. Once the temperature rises above 10°C, they wake up and start laying eggs again.
Try visiting a country house in winter or early spring, and the moment you turn on the heat, you might see flies coming out of hiding. These are the sleepy females, ready to repopulate your home.
But Here’s the Catch—Houseflies Don’t Bite
No matter how annoying they get, houseflies never bite. Their mouthparts are only suited for licking and sipping—they can’t pierce skin. Even when they land on bread or other solid food, they need to soften it with saliva first before feeding.
So… if houseflies don’t bite, who does?
Meet the Real Culprit: The Stable Fly
Often mistaken for the housefly, the stable fly (Stomoxys calcitrans) is the real villain here. It looks very similar to the common housefly but belongs to the same family.
There are differences, though most people wouldn’t notice them. The stable fly is a bit smaller, with a speckled gray back and a pointed mouthpart that resembles a needle. And yes—it can pierce skin and does feed on blood.
Bloodsuckers of Summer
Stable flies live almost everywhere except in the far north. You’re unlikely to see them in cities. They prefer rural areas where livestock are kept. Cattle are their favorite targets, though they’ll bite horses, pigs, and—if given the chance—people.
They also reproduce quickly. From egg to adult can take just 6 to 20 days, with their larvae often growing in manure or even animal wounds. But here’s why August is their peak season: they thrive in hot weather, especially temperatures between 20–40°C. In most regions, that’s mid to late July. Give it two weeks—and boom, August becomes their invasion month.
Unlike houseflies, stable flies are not big on entering homes. But if one does find its way inside—watch out. Even if your house is filled with harmless houseflies, one persistent stable fly will make it feel like all the flies are biting you.
That’s the trick. It’s not all of them. Just one aggressive, blood-hungry intruder.
