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To make this one, get a tall jar and roll a paper funnel. Tape the funnel to the top with masking tape and make sure there are no small gaps in the folds of the tape that would allow the flies to escape. You can put in vinegar before the funnel or after. Add about 1/4″ (approx 1cm) of vinegar. Apple cider vinegar, malt vinegar, red wine vinegar will all work. If you need to add more, you can leave the funnel in place and just pour it in. Then just place it where ever you are having trouble with fruit flies. Of course you will want to eliminate the source as well, so ditch old fruit and clean your sink drains. If you are having trouble catching flies, check the placement of the jar, make sure the vinegar a stinky kind. ( distilled vinegar will not work) and if its still not working, make a better funnel. Steeper tends to be better. The scientific name for these is Drosophila melanogaster, also know as a vinegar fly.
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