I made the mistake of using hedge apples to try to get rid of spiders, and instead I got a house full of gnats. :-( I put small bowls of vinegar out, with enough veg oil on top to thinly cover it. I was amazed at how many of those pesky gnats I caught in them. Literally hundreds of them.
Are you talking about fruit flies? They look like gnats so if that is what you mean, put some red wine vinegar out. Works well to put it in a bottle because they crawl in and can't get out or just use some left over wine. It works every time.
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