I'm currently doing a science project on this topic and haven't found the exact answer just yet. However, if this helps anyone, fruit flies are attracted to decaying fruits rather than fresh ones because those fruits contain more yeast and alcohol due to fermentation. Fruit flies also enjoy Carbonated Beverages although that is not a type of fruit.
Definitely bananas. The bright color along with a strong fruit odor will attract them. Just ask any bartender, we always have lemons, limes, Oranges, and of course, fruit flies. Any of the fruit in a bar's fruit tray would be a close second for most attractive to these flies. . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . Here is the experiment you can do to get your answerr: Get several plastic cups. Use as many fruits as you like to want to test, Apple, peach, grapes, banana, orange etc. tape an outer layer of plastic wrap on top of the cup after you depostit a couple of pieces of fruit, poke some tiny holes in the plastic so they can get at the rotting fruit, and set it out on a counter. After a few days, you will see the fruity flies in each cup. When you are ready to quit collecting, take some rubbing alcohol , pour it on the top of the plastic wrap with the holes and cover again with another piece of plastic wrap sandwiching the alcohol between and let no air in so you can kill them off. When they are all dead, count up! ((From Bitter Experiernce, personlally, I find bananas seem to attract the most. Dont know the chemical analysis of a banana vs. a kiwi but you are the scientist, let the world know why and win a Nobel Peace Prize! Good luck on your project.
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