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Rust spots on ornamental rowan trees-advice needed

Hi I have 5ft ornamental rowan saplings planted in my garden -The Sheerwater seedlings and Joseph Rock variety have rust spots on their leaves- does this require  treatment?- also what is it/ does it harm the tree? -also should they be fertilized-if so what do you suggest-?

-I would appreciate any constructive insights and suggestions-Thank you

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