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Spots on my rose canes

11 years ago

ALL of my knockouts and double knockouts (13 in all) have black spots on their canes, from the ground up. They are in totally different areas of my yard, all get at least 5 hours or more of sun, all are well drained and not crowded. They have bloomed fantastic for me every year and are busting with new growth. I just cut them all back to tidy them up, which is when I noticed the spots. Is there any idea what this is or how to treat it?

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