I have a 15-20 year old Magnolia tree, about 30 feet tall, and that has been extremely healthy until this year. Attached are several pictures. I believe it is a Southern Magnolia ( Magnolia Grandiflora) and is in full sun. There are no competing plants near it and nothing has been disturbed in its root system. Thank you for any advice you may have, as I really don't want to lose this tree. There is also another identical tree in another part of our yard that is doing very well...