Sep 16, 2013 - 07:31 AM
Our granny has a regular problem with gnats too. They come from the outside and can't be stopped.
Indoors, use these products to kill them -
Temprid Ready to Use Spray can be used to treat the soil around houseplants where they may be nesting and breeding. You can also spray window sills, etc. Its a great product, but don't spray it into the air.
Goldstick - Place this on a table or hang it from the ceiling.
CB 80 - Fog the rooms, kitchen, etc where you see the gnats. This can is used by simply pointing it into the air and pushing the button on top. It sprays (fogs) the pyrethrum into the air and kills the gnats. 2-3 seconds per room is all it takes. The entire can will spray about 300 seconds, you can fog your house the rest of the year with 1 can.
Other than this, gnats are difficult to control. If they are coming from houseplants, drains, etc, then that is easy to control. But they always usually come from outside, and it is impossible to control them outside.
Hope this helps.