Woolly aphis is the pest of

Woolly aphid is the pest of Peach.
Woolly apple aphid is a serious pest of peaches and apples, particularly young trees. Colonies form at wound sites on trunks, limbs, and twigs, where they feed on tender bark.
Pruning and hail damage can create wound sites for attack by this pest. Egg-laying wounds by the periodical cicada are ideal sites for infestation.