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Wiper your finger across the top of the leaf , does the splotches come off? if so it's most likely Powdery Mildew, If there is white to yellowish speckles impregnated into the leaf then it maybe mites or thrips check the underside of the leaf for pinhead size crawlers aka "the borg" as I would...

Sulfur Burner or neem oil

Kinda hard to see but looks like Powdery Mildew