Is my white mulberry dying or just stressed?

Mulberry rarely declines quietly; it is far more often structurally finished than sick, with decay behind old breaks, hollow stems, and bark sloughing off dead scaffolds while the rest of the tree looks vigorous. Stress is midsummer yellowing or leaf drop after a dry spell; dying is dead limbs and cavities with shelf fungi at old break points in the upper crown — and on a fast-grown, brittle species that can be well advanced while the lower canopy still looks perfectly healthy.