Knock Out Roses Yellow Leaves

We have several Knock Out roses. They have some new growth but the old growth has yellowing leaves with black spots on them. What is this and is it a common problem? What should we do to remedy and keep it from reoccurring? Thank you!

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1 Comment To "Knock Out Roses Yellow Leaves"

#1 Comment By AnnsGreeneHaus On 03/11/2013 @ 6:18 pm

This article should help: https://www.gardeningknowhow.com/ornamental/flowers/roses/yellow-rose-leaves.htm ^[1]

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