I know, I know...why on earth do I want to attract fruit flies?! I don't, but Little J is studying insects at school and this project is one of the "extra" fun things on his list to do at home.
an overripe banana
a rubber band
a piece of cloth
a calendar page
Peel an overripe banana and place a piece of it in an open jar. Then, set the jar outside and wait for fruit flies to find it. If there are fruit flies around, they will start to appear around the banana in a few days. Wait until there are a few flies inside the jar and then cover the jar with a piece of cloth, secure with a rubber band. Watch what happens...
Little J started with about 4 flies in the jar. There was very little activity after about a week. However, in what seemed like overnight around week 2, there were probably 50 flies in the jar. We took them outside and let them go. The inside of the jar was pretty gross, but you could see a few different stages of fruit fly development in progress. We replaced the cloth over the jar and waited to see what happened next....which was more fruit flies.
Make sure to write down when you start the project and observations along the way on the calendar page.
This link at Pestworld for Kids provides information to assist kids in doing a full science fair experiment with fruit flies (including forms) and explains their life cycle very well.
Linking to: Science Sunday at Adventures in Mommydom