Utah State University Extension
Shothole is a common fungal disease in Utah. It attacks dormant leaf buds, blossom buds, leaves, fruit, and twigs. The first visible lesions occur on young leaves as small, round, tan spots that eventually fall out, leaving round holes.
Murray, Marion and Alston, Diane, "The Backyard Orchard – Peach and Nectarine pests" (2011). All Current Publications. Paper 971.