Q.Peach Tree
About half of the tree leaves have turned brown with some small holes in them and other leaves are turning but not brown yet. Other leaves on the tree are green. I cannot see any insects.

Alisma
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on August 11, 2016
Shot hole disease or another fungus could be the problem:
https://www.gardeningknowhow.com/plant-problems/disease/shot-hole-disease-fungus.htm
https://www.gardeningknowhow.com/edible/fruits/peach/common-peach-diseases.htm
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