Check it out here: http://mastervintner.com/blog/mice-and-men-fruit-and-flies/
What's your worst experience with fruit flies? Back when I was a beginning winemaker I filtered my first wine and left the used pads sitting on a counter while I stepped out for 'a minute'. I came back in two days and the air was about 50% flies by volume!
That really sucked. Now I bag 'em tight and toss 'em as soon as I'm done.