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It looks to me like its infected with a fungus - Asperisporium caricae is a candidate, but this infection and others are just called black spot infections. If you've had damp weather, that makes it worse. Consistent application of fungicides seems to be the only way to keep it in check. Link below might be of some use, scroll down to Black Spot ...


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Rose rust, yes, but the poor thing will never be very healthy contained in a pot. Unless its a miniature or dwarf/patio rose, they really don't do that well in containers over time. If you can find a space for it in the ground, do so, and prune back to outward facing buds on each stem, taking any topgrowth which looks unhealthy before you plant it out. Burn ...


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It looks to me like rose rust. If so, it's a fungal disease that is specific to roses so it won't affect any other plant species, and despite making the rose look a mess, it's not a particularly serious disease. See https://www.rhs.org.uk/advice/profile?PID=269 The blackened leaf in your second picture looks like to me like is just "dead" and/or burned by ...



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