right before like any misting want it dry before light fire back up
@Donaldj ty sir! Will spray tonight before lights out, then hopefully tomorrow i can move into fresh new tent
Went ahead and bought some Organic Neem oil from ol wally world the other day. It says it is safe to spray up until last week of harvest. I went agead and removed what few infected leaves i could see, then lightly misted the plant with the neem oil. I did it just after lights on, since the bottle says to do it during sunniest part of day. 2 days later, all wpm is gone and no new spots! Went ahead and preemptively spray the plant next to the blueberry just in case there was cross contamination
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Did you get things figured out… 
Humidity rises during dark hours…
Some rooms will climb up to 30% to 50% humidity during dark hours…
Air movement , air movement , air movement…
1 oz neem oil to 1 gallon good ph’d water with 5 drops of dawn dish soap… once every 2 weeks should keep powdery mildew away…
Hey, just saw this. Milk is a better choice than Neem oil. That will affect the quality of the buds, especially terpenes.
@Myfriendis410 @peachfuzz yes thank you! I did get it figured out. I was skeptical about the milk so i did try the organic neem oil. Now, it says it is say to spray up until a week before harvest with no effect to taste or smell, but we will see! Luckily the problem was very small and only on a few of the very small fan leaves under the scrog!