A lot of people recommend cider vinegar (or homemade kombucha works well). It has to be in a closed container with small openings. I've used cone shaped coffee filters wrapped and taped in a tight cone (like you could use as a small megaphone) with a small opening at the bottom. I then take the cone and put it into a bottle with a smallish opening. The bottom of the bottle or jar has the cider vinegar in it. Currently I have a mason jar with holes poked into the canning lid. The idea is that it is easy for the fruit flies to get in but a lot harder for them to find a way out so they eventually drown inside.
This has helped but the best thing, in my opinion, is to find the source of where they are laying eggs and reproducing. For me I had lots of fresh produce coming in from the garden that didn't go into the refrigerator (especially the tomatoes). A friend mentioned that she used bleach on her produce to kill the eggs which I of course didn't want to use. So, I thought about hydrogen peroxide and sprayed that on my tomatoes and it seemed to drastically reduce the fly population.
Hope that helps some, Jolene
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