Help! Paw paw weird crusty leaf growths

corkball (z9 FL)
2 months ago

I have a asimina triloba with these weird gray growths all over the tops of the leaves. Most are really small, but I took pictures of the biggest one I could find. They scrape off easily, and appear to be empty. I suspect some sort of left overs from a leaf sucker of some sort. I had scale on it last year, but this is not the same, and scale was much harder to scrape off.

view from the top

view from the side

The tree seems to be ok, but the leaves are not as perky as its neighbor.

What is this, and what can/should I do about it?

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