How to Make a Fly Trap

Turn a Soda Bottle into a Fly Trap

Soda Bottle. Photo © Erin Huffstetler

Having flies land on your food isn't just annoying, it's a chance to get sick. Fight back by making a fly trap to lure them away from your picnic and your home.

To Make a Fly Trap You Will Need:

  • A 2L soda bottle
  • A serrated knife
  • A permanent marker
  • A piece of wire to hang your trap (optional)

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Mark Your Cutting Line

Mark Your Cutting Line. Photo © Erin Huffstetler

Draw a line all the way around the bottle, just below the tapered neck.

Cut the Top off The Bottle

Fly Trap - Parts Cut. Photo © Erin Huffstetler

Cut along the line to remove the top from the bottle.

Assemble and Bait Your Fly Trap

Assemble and Bait Your Trap. Photo © Erin Huffstetler

Remove the soda cap. Then, flip the top of the bottle upside down (so that it looks like a funnel), and slide it into the bottom portion of the bottle to complete your fly trap.

How to Bait Your Trap:

Fly larvae feed on rotten meat and feces, while adult flies feed on sweet things like decomposing fruit. Bait your trap with either of these things, and you'll attract lots of flies. To keep bees out of your trap, add a splash of vinegar to the mix.

A Note About Wasps: Meat and sweets will also attract wasps to your trap. If you only want to catch flies, bait your trap with fruit and vinegar in the early spring and fall months. Switch to meat and vinegar in the summer.

Want to get rid of wasps too? This trap can serve a double purpose. Just use meat and vinegar as your bait in the early spring and fall, and sweets in the summer.

How the Trap Works Flies smell the bait, and fly into the bottle to get to it (either to lay eggs or to feed). Once inside they aren't able to navigate back up the narrow opening, and they become trapped.

Maintaining Your Trap:

Empty the dead flies and re-bait your trap regularly. If you decide to use meat or animal droppings (chicken litter, rabbit pellets, etc.) as bait, you'll also need to destroy any larvae that you find in your trap. Filling the bottle with hot water should do the trick.

Make a Handle for Your Fly Trap

Make a Handle for Your Fly Trap. Photo © Erin Huffstetler

If you prefer a hanging trap, use a hole punch to punch two holes at the top of the bottle (make sure they go through both layers of the trap). Then, thread a piece of wire through the holes; crimp the ends; and your trap is ready to hang!