What's wrong with our tree
I cannot tell from the pictures what has caused the damage but there was a severe frost in May that caused extensive damage to large trees. There are fears that they may not recover. I suggest that you reduce any other stress that the tree may suffer. Keep it watered—one inch a week and perhaps if your area goes into drought conditions, water it more often.
For a better diagnosis, consult with a certified arborist. Go to www.treesaregood.org the website of the International Society of Arboriculture to locate an arborist near you.
Thank you for your question.