Our American Chestnut tree.

Question

We inherited a mature American Chestnut. It is approximately 85 years old. Last year we noticed that the leaves on one side of the tree were small and yellowing. This year that side has no leaves at all. We live in Ca. and realize we went through a drought and that a large Eucalypyus windbreak was removed last year which certainly has had an effect. However our arborist says that the boughs are not dead and to leave them for now and do some research as to the cause. I wondered if you could offer any insight?
Merle Ruedrich
I will try to attach photos

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Answer 1

There is a Chestnut Blight disease that can effect and kill these trees.
I can't determine any such disease, but am listing some information for you.

http://msue.anr.msu.edu/topic/chestnuts/pest_management/major_diseases

http://www.esf.edu/chestnut/background.htm

I would also suggest you talk with your County Extension Service and relay the symptoms to them.
They will have regional information on the diseases, pests and issues with your tree.

Here is a link to help you locate your nearest office.

https://www.gardeningknowhow.com/extension-search/