Q.What Causes Leaf Brown Spots On Pear & Apple Trees?
used good fertilizer, sprayed for Japanese beetles, leaves have brown spots

Certified GKH Gardening Expert
These articles should help:
https://www.gardeningknowhow.com/edible/fruits/apples/apple-tree-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/apples/treating-apple-scab-fungus.htm
https://www.gardeningknowhow.com/plant-problems/disease/plant-leaf-spots.htm
https://www.gardeningknowhow.com/edible/fruits/apples/black-rot-on-apple-trees.htm
https://www.gardeningknowhow.com/edible/fruits/pear/fixing-pear-tree-problems.htm
https://www.gardeningknowhow.com/edible/fruits/pear/pear-tree-diseases.htm
https://www.gardeningknowhow.com/edible/fruits/pear/what-causes-pear-leaf-blight.htm