2 Easy Do-It-Yourself Fruit Fly Traps
Fruit flies are such a bummer; here are two ideas for fruit fly traps (homemade variety).
Method #1 - The Bowl Trap: This homemade fruit fly trap is super simple to make and results in dead gnats.
Step 1 - Get a small bowl.
Step 2 - Put about 1/3 cup of apple cider vinegar in there. It is important to use apple cider vinegar and not regular vinegar because the gnats like the sweetness of the apple cider. If you don't have apple cider vinegar, you can also try white wine or fruit juice.
Step 3 - Add a drop or two of dish soap. Why? No, you are not giving the fruit flies a bath. The soap breaks up the tension in the liquid so that the fruit flies can't just land on the vinegar, have a drink and fly away. By adding the soap, your fruit flies are more likely to drown - that's what kills the fruit flies.
Step 4 - That's pretty much it. Throw the contents out once you have a bunch of dead fruit flies sitting in the bottom and re-fill as needed.
If you are more of a visual person, here's a good video I found that explains this homemade fruit fly trap in more detail.
Fruit Fly Trap: Homemade Option #1
Method #2 - The Cone Trap: This homemade fruit fly trap allows you to capture the fruit flies alive. This is useful if there happens to be a bounty for their live capture, or if you are simply opposed to killing them.
Step 1 - Get a tall glass or jar.
Step 2 - Put something to attract the fruit flies in the bottom. I recommend a small piece of rotting fruit, but wine, fruit juice, or apple cider vinegar (or some concoction of four) will also do the trick.
Step 3 - Get a piece of paper and make it into a cone as you see pictured below. The bottom of the cone should be nice and small with an opening of about 1/2 cm. I like to use a simple piece of 8.5 x 11 printer paper. Use tape to keep it in its cone formation.
Step 4 - Place the cone in the jar or glass such that you have about 1 inch of room from the attractant in the bottom of the container. Seal the paper to the glass with tape as you see pictured below.
Step 5 - Place the homemade fruit fly trap near your problem area and wait. The pesky little critters will find their way into the trap, but won't be smart enough to find their way out. Once you have a trap full of gnats, take them outside and let them go. If you prefer to pull a mean trick on your roommate, you can also release them in their car instead.Credit: http://www.flickr.com/photos/stringbot/229802351/
There you have it! Two easy fruit fly traps of homemade ingenuity.