I know that I am not the first one to mention this but still, I think some will find it helpful. I have sprayed my peach and apricot trees with Bonide Fruit Tree Spray twice so far this season. On both occasions, a couple of days later, I noticed burn holes in my leaves. Later I noticed the skin on some of my young peaches exhibit various degrees of burn as well. From my reading on this site, it looks like Captan is probably the chemical agent that is responsible (thanks Tippy!). Additionally, it sounds like, if you are going to spray Captan, it is best to do so in the heat of the day so it dries as rapidly as possible to minimize possibility of burning? (I sprayed evening then early morning - mistakes both times)
Here are results on peach leaves:
Here are results on some peaches:
Seems like a good thing to know.