Dying rose buds
Thanks for writing. It sounds like the powdery coating on the leaves may be powdery mildew, a common disease. It can attack rose flowers and buds, as well as leaves, though there are other diseases (such as botrytis) that could be affecting the flowers. Without being able to examine them, I can't say for certain. But applying fungicide before you see any problem should help prevent disease from occurring.
---Justin, Senior Garden Editor, BHG.com
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