Per information found online, it seems like my tree has chlorosis issues. I have checked photos from two years ago, and yellowing was starting to occur in late July. By September, leaves were already falling. This year, the tree is bare, relative to other years, and has shown increasing signs of damage. I've seen treatments over the internet including in the extension, but I'm wondering if the tree is worth saving or if should I just go ahead and plant a new one. I would like to save it, of course.