problem with the fruit on my peach tree.

Question

The skin is wrinkling on my young fruit on my peach tree. Hope you can help with why this is happening

Answer 1

The most likely reason is water deficit/drought stress. The other possibility is a fungal disease, peach leaf curl. But that would have been preceded by leaf curl and discoloration.

Peach trees are one of the most problematic trees to cultivate, they are subject to several pests and diseases. It takes a comprehensive preventive management program to prevent the common problems. Prevention is the key concept, be pro-active, don't wait until the tree or the fruit shows a problem before taking action.

Start with good soil and water management. Build soil organic matter content, test the soil and apply amendments according to actual nutrient deficiencies found, or at least use a general purpose complete organic fertilizer. Mulch the soil surface and deep water the entire soil surface of the absorbing root zone weekly or twice a week depending on climate an soil conditions. Dormant spraying during winter is essential to reduce overwintering insect eggs/ larvae and disease.

https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-care.htm