I am trying to figure out what causes very few leaves in this unnamed rose to turn yellowwith tiny black dots. Not sure if they are black spots as they are so tiny compared to what I call black SPOTS. Other nearby roses have a handful of "normal" black spots. These are so tiny in comparison. The infestation is not large for the black spots and for the tiny black dots so I am just wondering what's up with that? The weather has not been wet this Spring here in southern France

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