Last year around this time, we were having a serious gnat/drainfly problem. They were in the bathrooms, they were in the kitchen, they were everywhere. With a couple of rounds of traps, we got rid of them. Now we're starting to notice a few around the house again. One or two in the kitchen isn't unexpected if you keep fresh produce in the house, but once they become noticeable, that's when you need to do something before there's a full on infestation. This morning I rigged up a couple of these super easy gnat traps and I thought I'd share them in case you guys are having the same problem!
I didn't take step by step photos of this because honestly it's so easy. You need a cup, a piece of fruit (I always use banana because it works well, but you can use whatever you have), a piece of scrap paper, and some regular tape.
To make the paper cone: hold your piece of paper horizontally. Fold each corner toward the center. This will make a point at one end and a round cone shape on the other. You want the pointed end to be really small. Gnats are teeny tiny, and the goal of this is to let the gnat in but for them not to be able to get back out. Make the hole smaller than you think it should be. The cone end should be large enough to fit inside the glass and touch the sides. You may have to play around with it to get it right. Once you've got the right shape, tape the overlapping part to hold it together.
To assemble: Drop the bit of fruit in the bottom of the glass. Put the paper cone in the glass, making sure there's a good bit of space between the cone bottom and the piece of fruit. Tape all around the glass where the glass and paper cone meet (I have totally seen gnats fly out of the seemingly no space that exists there before, so you want to tape it up to prevent that from happening). You're done! Place wherever you've seen the most gnat activity. I have one in my kitchen and one in my bathroom right now.
Troubleshooting: If you're still seeing gnats around but they aren't getting into your trap, your hole might actually be a little too small. take a pair of scissors and snip off the end to make it a little bigger. If you have seen gnats in there and then later they're gone, your hole is too big and/or your tape on the sides isn't done properly. Go back and try again!
Emptying the cup: Unlike some other gnat removal methods like wine or vinegar, this method will not kill the gnats. Once you have a good number of them caught in the cup, go outside, close your door, and let them out. Reset the trap if you still have gnats remaining in the house and you're good to go.