Q.peach tree problem
I have a peach tree but noticed growing something on the leaves. What could it be? And how do I treat it? It is beginning to give fruit so I hope I can remedy this before the fruit develops. It looks like it started this week. I never seen it before and it is the first year that it giving fruit, for we have for at least two years.

This is the onset of peach leaf curl. For more information and a course of treatment, please visit the following link:
https://www.gardeningknowhow.com/edible/fruits/peach/peach-leaf-curl.htm