First of all your pics suck man.. get a better camera.. from waht i can see you for sure have some nutrient problems.. I dont think its super serious though. overall you have a pretty sweet garden. so the white spots wont wipe off? I would think then that its not powdery mildew or any type of fungi problem. and for sure not insects.. so what could it be? its not a stain.. I need to see it better to make any sort of diaganosis.. best of luck to you and let me know if you can get a better shot of those.. and or.. if your problems get worse..

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Horticulture Science