This sounds like fruit flies, not gnats. There was an article about them on spark people: http://www.dailyspark.com/blog.asp?post= how_to_get_rid_of_fruit_flies It referenced a food network article which had even more information: http://blog.foodnetwork.com/healthyeats/ 2012/09/02/how-to-get-rid-of-fruit-flies/
I get these every fall when I start bringing in my tomatoes. Leaving ripening fruit outside actually can mean they have MORE exposure to these flies, you just won't see them in the house.
They only live a week, and I actually will vacuum them up in my kitchen. I know that they can fit through my screens, so I have been seriously thinking about rescreening them with a finer mesh that these can't get through.
I don't seem to have a problem with tomatoes left on the counter but do periodically have a problem with houseplants. Go to Gardens Alive and buy one of their solutions. For houseplants I bought those yellow sticky things that trap them as they fly out of the soil. I think they have traps for fruit flies too.
I read that a small plate of cider vinegar works but haven't tried it.
I got home from a weekend away to find a horrible gnat problem in my kitchen. I have been picking my tomatoes before they are completely ripe b/c of the extreme heat we've been having. The gnats LOVE them!
My question is this.... how do I harvest my tomatoes before they crack to bits but keep the gnats out of the kitchen? My mom always used to place the partially ripe tomatoes on the kitchen counter so that's what I'm doing but I don't ever remember her having this problem!
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