I think I posted a pic in the past that organza bags do not prevent pest like Oriental Fruit Moth or plum curculio from laying eggs or boring holes through the bags.
Today, I checked my Winblo peaches that I bagged. One peach was damaged by OFM (they have been actively evidenced by several flagging shoots these past few days). There were two holes, one on each side of this peach. The sites where the holes were made had gooey sap as the peach responded to its injury. I, obviously did not spray Surround in time for it.
I have only 3 Winblo peaches that set this year. I have two other trees full of PF24C and the Autumn Star peaches. That @#$&#! had to attack my Winblo.