I bought a system like that last year but never used it (or saw need to). I'll pull it out for this winter if needed.

Have you seen these for fungus gnats???

I may try them this year if I have the usual gnat issues!

http://www.leevalley.com/US/garden/page.aspx?p=56634&cat=2,51555&ap=1

Yup, used some yellow sticky traps (different brand) last year.
If I can find the pic of all the fungus gnats flying in circles (once their brethren were stuck), I'll post it. 😆 😆
Summary: more fungus gnats survived, than were caught by the traps.

I have yellow-siding on my house and know all about how that attracts insects.
You should see the south siding on a sunny mild warm day in February.
Literally a million flies buzzing around on the siding; presumably, came out of the lawn with the warmth.
I should put vaseline on the house!

Barb

MY plants dont seem to be too effected this year (so far). I have a fugus gnat problem every winter, same with spidermite (common and the ungodly red bastards), and sometimes scale. I only use safers soap, or a spray bottle with a drop of dish soap. You can apparently put a small amount of horticultural oil, olive oil or mineral oil in the mix, as well as garlic, chilli pepper, and crushed chilies. You just have to spray off that mix in a few hours, because the oil can block the pores on the leaf and suffocate the plant.

This year im spraying with warm water and a drop of dish detergent once a week. Im also going to use a small fan to move some air around, and discourage some pests.

Personally, I find the hard part, is remembering to water them all..