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Most likely it is the plum curculio, which also attacks plums and other types of fruits.
In its adult stage, it is a little beetle-like insect, it's actually a weevil, that lays an egg under a flap of skin of the fruit. When it hatches, the larva crawls to the center of the fruit and feeds around the seed.
If it happens really early in the process the fruit falls before it even gets close to ripening. But it can also happen so late that you pick a ripe peach and find a worm inside.
Plum curculios primarily are attacking from about the time that three-fourths of the petals are falling off the tree in the spring on up pretty close to harvest. And any control sprays that you do need to be done between that period of time between the three-fourths of the blooms falling off to about two weeks of harvest. It's too late this year to do much for your crop this year, but be ready to control the insects next year.