Can you help recognize this disease?

stefyxJuly 6, 2014

Hi there. A lot of my roses started developing a disease in the last 1-2 months.
It's got these yellow spots on the frontside of the leaves and black/yellow fungus-like dust spots underneath. I'll attach pics because it's hard to describe. (Uhh, I can only add 1 pic).

I'm trying to Find what it is named so I can get treatment. Hope you can help. Thanks a lot !!!

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This is the front. I'd like to underline that some of the fungus/whatever it is on the backside is yellow, if you can't see from the photo. Many thanks :)

    Bookmark   July 6, 2014 at 4:50AM
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IanW Zone 5 Ont. Can.

You have rust on your rose

Here is a link that might be useful: Rose Rust

    Bookmark   July 6, 2014 at 7:16AM
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Uhh thanks!!! I was thinking it might be rust but I thought it should be primarily yellow, not blackish...I guess the black is just oxidised yellow.

    Bookmark   July 6, 2014 at 7:20AM
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anntn6b(z6b TN)

Yes, it's rust.

No, the black isn't oxidized yellow. In fact, the black is even worst. If you had a microscope, you'd see that the black are larger spores (when compared in size to the yellow spores also on the underside of leaves.) The black spores look like two wizard's hats joined at the base. What makes the black spores worse is that those are where the disease overwinters and will be the source of the disease next year.

    Bookmark   July 6, 2014 at 11:11AM
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