Problem with Filter flies

[Max Ali]

Hi Tony,
I know this isn't your specialist area but I am hoping you may have seen this problem elsewhere. Since this summer I have been having problems with filter flies in my kitchen. I can't identify where they might be coming from. They are very small (about 2 mm long). I had my windows/kitchen changed last year and didn't have a problem before then. The kitchen is north facing and has damp crazy paving and lawn outside. Apparently the flies like this type of environment. I can't see them outside though. Maybe the light is too bright for me to see them.
Sorry if this isn't a relavent question for your site but I've been trying to get to the bottom of this and the local council hasn't been of much help.
I have booked in a pest control company for next weekend but I'm not sure they will really get to the bottom of the problem. They'll probably recommend I spray everything when it may not even help.

Thanks for any tips.

[84-1093879891]

Hi Max,

I've no idea what to suggest. If you do think it stems from the damp paving outside, then maybe a paving sealant would help, but I can't be sure.

What about if you got a pack of those incredibly sticky yellow card thingies that I use in my greenhouse to trap whitefly, and position one or two where you think the flies are getting in, just to test your theory? It's only a couple of quid for a pack of 7 sticky-cards from B&Q - could be worth a go, perhaps?

Otherwise, it's wait for the Pest Control boys - they are often very, very good at identifying sources.

[Max Ali]

Thanks very much for your tips which I will try tomorrow.

[84-1093879891]

Has it helped at all?

[Max Ali]

I have to come clean and say I didn't get a chance to try anything on Sunday. I was knackered after working until 1:00am that morning. I think I will wait for the pest control guy on Sat. and see what he says. I will update this posting on Monday. I can't apply the paving sealant without prep. work because the paving has moss on it.