I have new windows and doors, my house is tight. No drafts in the
winter, no air leaks felt. How in hell do files still get in?
I keep finding dead ones on my porch carpet and sometimes one flying
around on a warm day. I can't find where they get in.
This might be a plausible source for the flies: maggots or eggs
that you brought in from the yard.
Long ago, we had a mountain cabin. Like the house you describe,
it was as tight as I could make it. I don't recall ever seeing a
fly or even a bug in the cabin. Then, one summer evening, I
poured a glass of Jose Cuervo tequilla and went to bed to read and
watch TV. There was still a good bit in the glass when I went to
sleep. The next morning, when I got up I took the glass into the
bathroom to dump out the remains and to rinse it out. What I
poured into the sink was at least 3 DOZEN gnats/fruit flies. I'd
never seen them before and never saw them afterward.
The theory we cobbled up was that in walking about in the yard,
someone in our cabin stepped in "something" that contained the
eggs or maggots, and then tracked them into the cabin. They
happened to come to maturity on the day or evening I poured the
FWIW, I followed up with an insect attractant-type of bait. Over
2-3 weeks it was in the cabin, it attracted nothing at all.
Yellow jackets, and lots of insects seem to be a little smarter than us.
Or at least their sense of smell is more sophisticated then ours.
You won't find a yellow jacket in a can of DIET soda. They don't smell
sugar and keep on going. That should tell us something.
I worked extensively with fruit flies as a teacher's aide. My job was to
hatch and raise them for student's genetic projects.
I would guarantee you that if you went to the fruit and vegetables in your
house right now, that there would be fruit fly eggs on them, ready to hatch
The flies you saw at your cabin were probably already there, or just
reaching a stage where they could fly. As with the OP, the flies were
either already there, or were in a stage ready to hatch out and fly.
Without very expensive air filtration systems, or poison, it is very
difficult to eliminate flies anywhere, as once you do, more move right in.
Before they are maggots, they are eggs, almost microscopic in size. You can
track them in on your shoes. In any case, hang a few rolls of fly paper from
your porch ceiling and don't worry about it. At least you're not afflicted with
an infestation of termites, stinging insects, or other far more bothersome
Houseflies are of the order Diptera, and Diptera can tolerate freezing.
In Vermont, snow would slide off the slate roof of the church and
pile up all winter. On the first warm day, thousands of flies would
emerge as the snow banks melted. On an autumn evening, I suppose they
would crawl under a warm slate, then hybernate, then freeze, then be
pulled of by sliding snow, frozen but alive.
I sometimes get flies in my house in winter. I believe they crawl into
a warm exterior crack as winter comes and eventually find their way into
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