ok bro your in flower you want to use a organic fix.....
Milk mixed with water can be used but PM will reappear in about 3-4 days..... you can also use baking soda mixed with water with the same results
Try using a 32 oz spray bottle of water mixed with greencure and 1/2 cup 3% hydrogen peroxide ...all organic fixes
Greencure can be used up til the day of harvest its bicarbonate.... Greencure kills the powder mildew you see on the leaves on contact....H202 kills the pm inside the plant by raising the ph to a level for 4-5 days where PM can not live
Dont not use Eagle20 if you are in flower... that stuff is systemic and not organic
Powdery Mildew is a air born spore
A 100% clean up of your grow area is also required walls ceiling fans.... everything...with a bleach water mix