Young leaves turning yellow on peach tree

Question

The small young leaves of my peach tree are turning yellow.
I have applied copper to stop the leaf curl I had. The leaf curl has been cleared.

Answer 1

Yellowing leaves can indicate watering issues; too much or too little.
If it has had Leaf Curl it can also be vulnerable to pests and other diseases.

https://www.gardeningknowhow.com/edible/fruits/peach/common-peach-diseases.htm