While gnats are generally harmless, they're invasive and very obnoxious. There are a lot of ways to eliminate gnats both inside and outside the home, including simple organic traps that can be made with standard kitchen ingredients as well as chemical treatments and sprays. Of course, the easiest way to treat an infestation is to prevent one from happening in the first place. A few simple actions can keep gnats from taking over the yard or kitchen in the first place.
While it may seem counter-productive, placing over-ripe fruit in a bowl near the gnat infestation is an effective way to get rid of them. Cover the top with a piece of plastic wrap and keep it in place using a rubber bank. Cling wrap also works well. Once secure, use a large toothpick to poke holes through the plastic wrap. The gnats are attracted to the scent of the rotting fruit. They crawl through the holes and get trapped under the plastic.
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