I'd have to see the underside but I agree with Ray. It looks like spider mite damage.
Flip a leaf over and look really closely for any movement. They're tiny tiny red little notes that move around on the leaf.
I have, unfortunately, been fighting them for months now. I use the same formula as Bill does on here. Some permethrin, a few handfuls of DE and a shot of dawn dish soap. Put that in a sprayer and have at it. It works great but doesn't stay effective for long so you have to keep reapplying. I think he did mention that the addition of the DE made the mix effective for longer than just permethrin alone.
Good luck, they're tough a tough little adversary.
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