Why do rose leaves turn yellow and brittle?

After a first bloom, my roses develop a scattering of yellow leaves mottled with green. Some varieties are more affected than others. If not removed, the leaves then turn brittle and drop off. I'm in Zone 8-9 and they are planted in full sun, where they do beautifully except for those leaves. What can be done? Thank you.

Submitted by book_mark

There are a number of causes of leaf yellowing. Without seeing the leaves or more information about the pattern and timing of the yellowing, we can't be certain what is causing it. A certain amount of leaf yellowing is natural. If only the older leaves are affected, this could be the case. Some fungal foliar diseases can cause leaf yellowing and spotting, too. You could take a sample of leaves just beginning to yellow to your local Cooperative Extension Service office for diagnosis and analysis.

Answered by DSchrock

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