Red Russian Kale white coating on top of leaves

Katie Snyder
last year

I bought some Red Russian starts from a nursery and planted them about a month ago. From the very beginning they've had a white powdery coating on the top of the leaves (the bottom of the leaves have no coating). The kale has grown well and it doesn't seem to have affected it at all. The plants and leaves have grown and gotten bigger at the same rate as lacinato I planted at the same time. They show no other signs of damage. After I pick leaves, the white powdery coating comes off if I run the kale under water and rub off the white coating with my fingers.

Does anyone have any idea what this might be?

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