Roger Carlsen, age 9 of Rochester, New York, for his question;

Where do fruit flies come from ?

Sometimes we find these pesky mites around a bowl, or basket of ripe fruit. They often hover around when peach canning begins. They weren’t there a short while ago end seem to come from nowhere. Actually, like all insects, they begin life as eggs. The mother fruitfly lays her eggs in ripe or rotting fruit or old garbage. They hatch into tiny maggots, go through a pupa stage and finally become flies, all this is done in a great hurry, for the fruitfly has only about two weeks in which to live his whole life. What's mores the early stages are often too smell for us to notice. The fruitflies that seem to come from nowhere may have been hiding as eggs or maggots under our very noses.

If the fruit was good and clean, the little pests may have been attracted by the rich smell of fruit from some nearby garbage pail or neglected pile of fruit. at any rate, be sure that none of them got into the diced peaches.