Tree is very old... beautiful green leafs in spring. Leafs are slowly turning yellow, with black spots. Last summer tree dropped all leaves by August. Tree is hollow in many main branches... growing spurts off major trunk.

Trimmed back old dead branches... not sure if tree is dying or disease. What course of action to extend healthier life? Not interested in cutting tree down... want to save!

Thanks for any words of wisdom to help save tree!!