localized swarm of flies in garage

 I live in Northern California, for years, I've had a locallized swarm
of flies in my garage that are only around in the daytime hours, near
a conventional-sized door that leads into my backyard (I keep this
door open for various reasons - laundry access etc.). In the evening
and night they disapear. The garage is extremely clean. I have no idea
what is attracting them, especially when they leave when its no longer
light out.
I tried fly paper, which doesn't work.
Wondering if anyone else has some constructive ideas
Thanks

  I'm cross-reposting this to alt.home.repair, where it will be seen by
many more people that the original groups it was posted to
(alt.consumers.pest-control, misc.consumers.house).

(I for one have no suggestions for the control or eradication of these
flies)

techman41973 wrote:
 

 
I've used a ShopVac to remove ground wasps; perhaps you could vacuum
them up.

The first thing I'd do, though, is wait until dark and close the door.
Next morning, all the files will be on one side of the door; that will
tell you if the source is in your garage or your back yard. I suspect
it's your back yard. If you can locate where they're breeding, you can
spray them (or remove what they're breeding in).


Gary

 

AK-47 or other assault weapon.

Just try not to shoot where there are electical cables.  I once met a
guy who would get drunk, then lay in bed with a shotgun and shoot
flies on the ceiling.  Then one day he shot thru a BX cable, blew out
half the house.  His landlord hired me to fix the electrical problem.
Well, I fixed the wiring, but the landlord had to get someone else to
fix all the holes in the roof.  His bullets went thru the plaster
ceiling, and continued right thru the attic and the roof.  There were
hundreds of holes in the ceiling. I imagine the roof was the same way.

But in your case, it's just a garage, so fire away. (except by the
wiring).