Q.apricot tree
My older apricot tree leaves have just begun to turn yellow from the outside in. There are tiny brown spots on the underside. I live in northern California so for the past 5 years all of the trees have been stressed by drought but this winter we had quite a lot of rain and the tree looked great until very recently. The fruit is limited but rather suddenly the leaves have shown yellow edges and some holes.
This does sound like a bacterial leaf spot, though it is difficult to determine from just the description.
I have listed some links to help you pinpoint the cause.
https://www.gardeningknowhow.com/edible/fruits/peach/common-peach-diseases.htm
http://msue.anr.msu.edu/news/management_of_bacterial_spot_on_peaches_and_nectarines
https://extension.psu.edu/plants/tree-fruit/diseases/stone-fruit-diseases/bacterial-spot
