Trees, Shrubs and Conifers: I need help in diagnosing this illness for a magnolia!, 1 by CWBYNCMH

CWBYNCMH wrote:
My grandmother has a magnolia in her front yard. The leaves are becoming spotted and falling off. This has been going on for the last coouple of years. She said it is getting worse. I had her send me some leaves and I have photographed them. I am not sure what kind of magnolia she has. The leaves were dried out by the time I received them. So the color is off. She lives in zone 7. Is this caused by a virus, bacteria, soil difieciency?? What can she do?? Any advice would be appreciated. Here is the top view.