The tree has always been well leafed out except for this spring.  There did appear some early dropping of yellowing leaves in late summer last year.  This spring there were a few flowers and now only about one fourth leafed out with many bare limbs.  These leaves are drooping and immature looking.  Wondering if the cold winter and late frost could cause this condition or does it sound like a disease.  Interesting that the leaves that are there are at or close to the terminal buds and lateral buds have produced few leaves.  I don't want to loose this tree.