Eucalyptus rust

Question from Shoot User

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New house, with an enormous eucalyptus that I had cut back to 25 feet in September. I see that the leaves are covered in dark red, raised spots that I assume is rust. What can I do? Whatever it is spread very quickly to a mahonia that I had put under the tree, I would hate to be responsible for spreading whatever this is to the neighbours. Advoce appreciated.