Splotchy Mandarin Leaves

MelbFruit starts with ...
Now that it's Spring, a lot is moving in the garden, including pests. I just noticed these lime-colored splotchy areas on the older leaves on my potted Imperial mandarin this week. Any idea what they are?

At first I thought they were leaf miners, but I don't see the little larvae, I have hormone traps, and they are targeting old leaves. I did spray with neem oil last week for mealy bugs, and there were a couple of sunny days, but I would think some kind of burning would affect more of the leaves, and especially young shoots.

Please help, is this a pest? A nutrient deficiency?

Thanks!

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