- 1). Remove the soda bottle's label.
- 2). Mark the bottle one-third of the way down from the mouth. Using a craft knife, cut off the top of this bottle along this mark.
- 3). Place a piece of overripe fruit or raw meat in the bottom of the bottle to bait the flies. If fruit flies are a problem, use fruit instead of meat.
- 4). Soak a cotton ball in water and place it in the bottom of the bottle to prevent flies from dehydrating, and suffering a slow death.
- 5). Invert the top of the bottle to make a funnel. Stick the funnel into the other half of the bottle.
- 6). Punch two holes on either side of the top of the bottle and thread wire or string through the holes to make a hanging trap. You can skip this step if making a ground trap.
- 7). Hang the bait on an outside branch or place it wherever flies are a problem. Check the container every day for flies. Release flies in an area away from your home or pour hot soapy water into the trap to quickly exterminate them. Empty the trap, clean it and replace bait every day.
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