How to make a fruit fly trap

Miss Thrifty5 September 8, 2013

fruit fly trap made from a jar, a paper cone and some old fruit

If you have an empty jar or bottle to hand, you can make a fruit fly trap in less than two minutes. I made two fruit fly traps today, after noticing a few of the little oiks bobbing around the kitchen.

Fruit flies get around, don’t they? All it takes (in my case) is one lonely, soft banana, at the bottom of an otherwise empty fruit bowl. And SHAZAM, there they are. To be fair, I think there are plenty of fruit flies around in my part of the world at the moment: here, the fruit is ripe on the trees and the brambles are stooping beneath the weight of all those big, juicy blackberries.

Anyway, making a fruit fly trap is super-easy. Here are the two I made, one from an old milk bottle and one from an empty jam jar:

fruit fly traps made from a milk bottle and a jam jar

Because you can use a variety of different containers and materials, I guarantee that you will already have everything you need to hand, and you won’t have to spend another penny. Here is what to do:

How to make a fruit fly trap

You will need:

  • A piece of paper. I delved into my collection of wallpaper scraps, but any paper will do. A piece of A4 is fine.
  • Sticky tape
  • Washing up liquid
  • An empty jar or bottle

And at least one of the following ingredients: 

  • Piece of fruit – the older and gunkier, the better
  • Apple cider vinegar
  • Red wine – old or new
  • Balsamic vinegar

Instructions:

  1. Make a paper cone and secure with sticky tape. Check that the the cone will fit snugly into your bottle/jar. 
  2. Make sure you have a small hole at the thin end of your paper cone. If you don’t, pinch off the end of the cone with a pair of scissors.
  3. In the bottom of your jar/bottle, place/pour one or as many of the above ingredients as you have. If you are using vinegar or wine, add a little washing up liquid and mix.
  4. Insert your cone into the jar/bottle. If you need to ensure a good seal, tape the sides of the cone to the edge of the jar/bottleneck. (I haven’t done this here, because the wallpaper I have used is thick, but if you are using regular paper you will need to do this, to ensure the fruit flies can’t escape.)
  5. Place your trap in the location where the fruit flies are plentiful. And wait…

 

If you have used washing-up liquid, the flies will drown in your trap: the soap lowers the surface tension of the mixture. But if you don’t want to kill them (i.e. if you are kinder than me) omit the washing-up liquid, and you can set your captured fruit flies free, instead.

There really are no hard and fast rules about how much stuff you should load your fruit fly trap with. But I will say a few things. Firstly, there is more red wine in my milk bottle than you would think from that picture – a good glug, in fact.

Secondly, if you add fruit, you’re playing  a longer game. The softer and more rotten the fruit gets, the more the fruit flies will love it. In my experience you are looking at days to catch your fruit flies, rather than hours. I also wanted to make this point because my picture shows a single, modest slice of banana inside that jam jar, and I didn’t want to mislead. I like to use banana because we usually have some about and banana pulp turns quickly, but since the picture was taken I have also added a peach pit.

You really don’t need to faff around too much with your paper cone. Any old funnel will do. As you can see from the picture above, the cone in the milk bottle is tall and thin, and it really doesn’t matter much. In fact, that bottle has snared a fly while I have been writing this post…

Homemade fruit fly traps like these should be enough to clear the occasional fruit fly flurry. However if you have regular infestations and you are DUNZO with the flies, there is a really good guide to getting rid of fruit flies here, on WikiHow, which has lots of DIY methods and fruit fly prevention tips.

A final note: if you set up one of these traps, don’t forget to clear away all the other potential sources of fruit fly food. Glug some bleach down your kitchen drains, take your food scraps out to the composter, make sure all your surfaces are clean (not that I’m suggesting they are anything other than sparkling!) and if your fruit bowl is full, bung it in the fridge for a while.

 

Did you enjoy this post?

Free Daily Digest

5 Responses to “How to make a fruit fly trap

Brilliant – this is just what we need. I’ve been noticing fruit flies in my kitchen recently and haven’t been too successful in swatting them. I am definitely going to have to give this a go -thanks for the tips!

September 8, 2013 at 9:52 pm

Miss Thrifty says:

They’re a pain, aren’t they? I’d definitely give this a go! Milk bottle has proved very popular with the wee fruit flies today…

September 8, 2013 at 11:17 pm

Ha – that’s a good idea. A variant on the partly full lemonade bottle with straws poking out to catch wasps that I have seen in Greece.

Mind you I had a lot of fun using a vacuum cleaner. Put it on high and chase the little b******s round the kitchen with the hose. Not very ecological with a 1kW motor but they can’t resist a strong flow of air and meet a dusty end. I use this for larger flies as well and to be fair fruit flies at least don’t alight on your food after having visited the latest dog lavatory or other disgusting deposits … 🙂

September 9, 2013 at 8:59 am

Miss Thrifty says:

John, what is the lemonade bottle with straws poking out the top? I must know! Is the bottle top sealed, so that the flies can get down the straw into the bottle, but can’t escape again?

September 9, 2013 at 9:32 pm

Miss Thrifty says:

P.S. TRAP UPDATE: I currently have 8 snared fruit flies, four per container. They seem happy enough: the ones in the jar are having a banana and peach banquet, and the ones in the bottle are sloshed.

September 9, 2013 at 10:11 pm

Leave a reply

Leave a Reply

Your email address will not be published. Required fields are marked *