White powder on leaves

I’m dealing with this right now in my outdoor grow, although yours looks different. I just bought some potassium bicarbonate on amazon coming tomorrow. I read a foliar spray recipe online for an ounce of potassium bicarbonate in a gallon of water together along with 1.5 cups of skim milk.
 
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Thank you guys. My humidity is a little bit high. Looks like white powdery mildew. I will try some method to stop.
 
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