An older Magnolia tree (about 8-9 years old) has suddenly started to turn brown and lose its leaves from the top of the tree. The tree is about 12-14 feet tall and seemed to be in great condition until about a week ago. About 5-6 feet of the upper part of the tree in turning brown. Except for watering the tree, we have done no other care to the tree.
Certified GKH Gardening Expert
It sounds like the tree has a fungus. I would treat the tree with a fungicide every 2-3 weeks for a few months. I personally like neem oil as a fungicide, as it is systemic and you do not need to be able to reach all parts of the tree in order for it to be effective.