Magnolia tree diseases.my magnolia tree has small brown dots on the leaves and they are dying.?

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Maybe this can help: http://www.treehelp.com/trees/magnolia/m...

The University of Florida says the same: "This tree is generally disease free. Magnolia may be subject to leaf spots caused by bacteria or a large number of fungi. Leaf spots rarely require chemical controls. Rake up and dispose of infected leaves."