Answer: The symptoms you describe sounds suspiciously like rose mosaic, a virus. The disease causes a yellow streaking, sometimes a zig-zag pattern, in leaves. The symptoms often show up in the spring, but not form on leaves that develop later in the summer. Theres not much you can do about it, and infected plants tend to be less vigorous, producing fewer blooms. If just a few leaves are affected, pick them off. If the entire plant is affected, it should be removed and destroyed.
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