Any idea what this leaf damage is?

Travis in PHX (9b)
2 months ago
last modified: 2 months ago

I spotted this damage on my leaves this morning. Any ideas what could be the culprit?
It kind of looks like leaf burn, but it's not confined to the leaf tips. I also haven't upped my fertilizer.
I did add DG Pro-tekt for the first time last week. We had strong wind yesterday (damage from blown debris?).
The white on the leaves is kaolin clay to help with sunburn and heat stress.

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