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Help! Being invaded by flies - lots of them!
Damned things just keep coming

 12:30 pm on May 19, 2009 (gmt 0)

For the last three or four days now our house has been inundated by flies (blue bottles), lots of them. I reckon it's well over 200 so far, and they just keep coming.

They're only downstairs, not up, and our thinking is that something has crawled somewhere and died, and the flies are hatching. For the life of us we can't see where they're coming from. As if in a horror movie they seem to manifest right before your eyes!

They flies are big, and very sluggish - easy to swat. However, because of the sheer number we've had to resort to chemical warfare in the form of Vapona - not something we really want in the house, but at the moment it's the lesser of two evils!

Pest control is next if this doesn't abate.

Anyone experienced this? Is it just a short cycle of hatching for a few days and that's it, or does the cycle continue?

How best to get rid of them?

I'm trying to think of which horror movies have scenes in which masses of flies swarm. It's not quite like that, but when those buggers have been sprayed and are breakdancing at 100 mph on their back and buzzing loudly, it's sure starts to get a bit disconcerting to say the least!




 12:50 pm on May 19, 2009 (gmt 0)

Drop everything, call a priest ASAP, and get an exorcism done!

But seriously, whenever we have an invasion of flies (not quite that bad), it can usually be traced back to spoiled food somewhere, or as you pointed out, a dead animal. Do you guys have a basement? That would be my first place to look, but I'm sure you have already done that. If it is a dead animal, I would think you could rely on your olfactory to lead you to the poor perpetrator, otherwise call the pros.

Good luck with that :)


 1:15 pm on May 19, 2009 (gmt 0)

wow, i managed to read "files" instead of "flies" until I was two paragraphes in.
Pest control would be my first thought, too, but maybe you can get your local lizard club to come by for a free meal ;)


 2:26 pm on May 19, 2009 (gmt 0)

Annoying as it is, this situation is generally self-correcting. When the source upon which the maggots are multiplying in consumed, there will be no more flies. If it continues between 10-14 days then there may be continuing source of nutriment which will have to be located and removed.


 3:48 pm on May 19, 2009 (gmt 0)

wow, i managed to read "files" instead of "flies" until I was two paragraphes in.

You weren't the only one! :) My first thought was a hacker/virus.

I tend to agree with tangor. Prevent access to any food supplies, and they'll eventually die. Passive traps may get some. But even one left buzzing around is almost as annoying as 2 or more.

The old Shell No-pest strips worked pretty well, but had to be taken off the market in the U.S. You can supposedly still get them in Mexico.


 3:52 pm on May 19, 2009 (gmt 0)

I just had this problem about 2 months ago and it was from something that had died. I never could find what it was, but I could smell it for a time before the flies appeared.

Then one day they were everywhere..just as you described, very large and easy to swat. I think it lasted about 3 - 4 days and they finally stopped appearing.


 4:09 pm on May 19, 2009 (gmt 0)

I had the same problem a few years ago, when I was still a university student.

However the source of the flies was easy to locate, it was the garbage bin in the kitchen and the dirty plates that kept piling up there.

A helpful tip for the summer: To prevent mold on dirty plates put them in the freezer. Keeps them fresh for a few more days.


 8:53 pm on May 19, 2009 (gmt 0)

Could be cluster flies, they don't need rotting food or anything to hatch. Google it, there are products to solve the problem out there.

[edited by: Rugles at 8:54 pm (utc) on May 19, 2009]


 10:18 pm on May 19, 2009 (gmt 0)

Definitely blue bottles, not cluster flies.

...maybe you can get your local lizard club to come by for a free meal...

Thinking along those lines, and because do get flies in the warmer weather, we recently bought a pitcher plant to take care of them.

First day in with this fly invasion and I'm feeding the poor plant until it's stuffed. Reckon it's got indigestion still.

The problem seems to have died down a little now. They're still coming, but in lesser numbers now. I've filled in a few cracks and gaps where they might have been crawling through. I've also bleach-washed floors and disinfected surfaces.

We found that our outside bin was teeming with maggots. This could be the obvious source, although how they're getting into the house is unknown.

Happily, it's bin collection day tomorrow.



 11:06 pm on May 19, 2009 (gmt 0)


We had that very experience last year. Ewe it was nasty. In droves they were coming from the window in our bath room. Never saw what they were hatching from...it lasted a few days and then they just stopped coming/hatching. Fortunately I was able to spray them with very soapy water aand that suffocated a bunch of them on the window sill. Damn it was nasty. Make me gag.


 2:07 pm on May 20, 2009 (gmt 0)

Neighbors Garbage Can left unattended for 3 days when they went on a short vacation.

Last year, horrible… We have a feline, boy she went after them, and that was more disturbing that the flies them selves. Broke 2 vases, knocked off a coffee maker full of brew, and a bottle of very expensive vine :(.

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