Pear tree lost leaves

Question

A pear tree lost 90 % of leaves. The tree looked normal 10 days ago. There are no fallen leaves on the ground, so I think bugs (?) had eaten leaves.
1. What is the possible cause of losing leaves?
2. Will the tree survive? If so, what should I do to help the tree get back to normal?

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Answer 1

The leaves appear marked and distorted. These can be signs of pests and or disease.
I would rake up any leaves on the ground and dispose of to prevent further spread of disease.
Inspect the tree more closely and use the articles below to help you.

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/pears-and-fire-blight.htm
https://www.gardeningknowhow.com/edible/fruits/pear/leaf-curl-on-pear-trees.htm