Humane, Homemade Fruit Fly Trap

Surface Level Shot Of Fruitfly On Leaf
Aukid Phumsirichat / EyeEm / Getty Images
01
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Start with a piece of paper

humane, homemade fruit fly trap
Pull two corners of the paper toward each other. Doris Lin

To make a humane, homemade fruit fly trap, you will need:

  • Piece of paper
  • Jar or cup with a small opening
  • Tape
  • Piece of fruit for bait

Start by rolling the piece of paper into a cone. To form a cone, start pulling two adjacent corners of the paper towards each other, along the long side of a sheet of paper.

02
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Curl the Paper Into a Cone

humane, homemade fruit fly trap
Curling the Paper Into a Cone. Doris Lin

Using both hands, Continue bringing the corners of the page together, and overlap them, curling the paper into a cone shape.

03
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Finish the Paper Cone

humane, homemade fruit fly trap
The opening in the tip of the cone should be very tiny - barely larger than a fruit fly. Doris Lin

Read through the instructions once and look at the photos before making this trap, so that you can see how big the cone needs to be, in relation to the jar or cup.

Curl the paper into a tight cone, with an opening in the tip of about 2-3 mm (less than one-eighth of an inch). You want a fairly wide cone, so don't curl it too tightly. Secure with tape near the point. If you forgot to leave an opening in the tip of your cone, you could snip off the tip, but it's better to remove the tape and adjust the cone, becuase it's too easy to snip off too much. Cut off the wide end of the cone, so that the cone is about 4-6 inches (10-15 cm) tall.

04
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Set the Bait

humane, homemade fruit fly trap
The bait - a small piece of banana peel - is set. Doris Lin

Set aside the paper cone. Now, place a small piece of fruit (I've found that bananas and peaches work well) in the bottom of the jar or cup. I've used a piece of banana peel and a baby food jar in this photo.

05
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Attach the Paper Cone to the Jar

humane, homemade fruit fly trap
Your trap is finished!. Doris Lin

Set the paper cone into the top of the jar. The top of the paper cone should easily rise above the top of the jar, and the point of the cone should stop before it reaches the fruit or the bottom of the jar. Secure the cone to the jar with two pieces of tape. You want to make sure that tape holds the cone snugly in the jar, without putting so much pressure on the cone that it buckles.

Your trap is done! Before setting it out, make sure there are no other fruit fly attractants in the room. Take out the garbage, empty your compost bucket, wash the dishes and hide your basket of fruit in the fridge or someplace where fruit flies will not smell your fruit. Set the trap on a countertop, next to a garbage can, or wherever you have seen fruit flies. Within minutes, you will probably have a fly or two landing on top of the paper cone. Walk away, and check the trap in a couple of hours.

06
of 06

Release the Fruit Flies

humane, homemade fruit fly trap
After a couple of hours, there are lots of flies in the trap. Doris Lin

Fruit flies will follow the scent of the fruit down into the opening at the bottom of the cone, but once inside, they cannot find their way back out. After a couple of hours, you will probably find some fruit flies in your trap. This is where the humane part comes in: Take your trap outside, remove the tape and remove the paper cone to release the fruit flies.

Don't let your trap go unchecked for longer than overnight. You don't want to keep them trapped for too long, and if they stay in there for more than a day, the eggs will start to hatch.

Chances are, you didn't catch all of the flies in the first couple of hours, so you'll have to re-set the trap. To re-set the trap, remove the bait, replace it with a new piece of fruit, then tape the paper cone back into place. If you continue to use the same piece of bait, the eggs on it will hatch and you will end up breeding fruit flies inside your trap.

Troubleshooting:

  • If flies are not attracted to your trap, make sure there are no other attractants (food, garbage, dirty dishes, etc.) in the area. You can also try using a different kind of fruit as bait.
  • If fruit flies are moving freely into and out of your trap, the hole in the bottom of the cone might be too large. Release any flies who are in your trap, then make the paper cone with a smaller hole in the tip. You want the hole to be barely larger than a fruit fly. Another problem may be that the paper cone is wrinkled and doesn't fit snugly into the opening of the jar, all the way around. Make a new cone, and be careful not to wrinkle the paper.

Doris Lin, Esq. is an animal rights attorney and Director of Legal Affairs for the Animal Protection League of NJ.

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Your Citation
Lin, Doris. "Humane, Homemade Fruit Fly Trap." ThoughtCo, Mar. 20, 2017, thoughtco.com/humane-homemade-fruit-fly-trap-127896. Lin, Doris. (2017, March 20). Humane, Homemade Fruit Fly Trap. Retrieved from https://www.thoughtco.com/humane-homemade-fruit-fly-trap-127896 Lin, Doris. "Humane, Homemade Fruit Fly Trap." ThoughtCo. https://www.thoughtco.com/humane-homemade-fruit-fly-trap-127896 (accessed November 19, 2017).