On Thu, 1 Jul 2010 13:31:39 +0100, "Mentalguy2k8"
wrote:


"Derek Turner" wrote in message
...
On Thu, 01 Jul 2010 12:12:01 +0100, Mentalguy2k8 wrote:

They're black and smaller than house flies.

Probably thrips a.k.a thunderflies, from your description of their
behaviour.


I looked those up, and it's not them. The ones I have are like "normal"
flies that you get in the house and on dog poo (the big blue/green ones that
buzz), except they are quite a bit smaller and don't land on anything, don't
seem interested in people or food. They are hanging around in seemingly
pointless groups like gnats do. If they landed on something I might be able
to work out what they're feeding on, but all they do is hover and jerk
around within the space of about a square yard. I can't see where they're
coming from or where they're going. All I know is that for every dozen I
kill, they're calling for backup and are back up to full strength within
minutes. But if I don't kill them, I still have the same number, it's not
like they're continually arriving, they just seem to reach a certain number
and maintain it.

Have tried spraying citronella on the door frames, curtains etc., but it
doesn't seem to bother them.

If they don't appear to land or eat anything they are probably one the
predators that eat the even smaller insects that you don't even
notice. Do they occasional make a sudden movement? Sort of jump six
inch.

Steve

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