Answer: I think that the white substance you see on the new growth is normal. As the leaves mature, their appearance will probably change. If you examine mature leaves, you will see tiny white hairs on the undersides of the leaves This should be very similar to the substance you've observed on the new leaves. The only other explanation is that the your plant is suffering from powdery mildew.....but you would see that on mature leaves as well as immature leaves.
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