Garden Cure during flowering?

My plants are relatively large, so flowering is kind of prolonged. I'm about 1 month and give or a take a few days into flowering and was hit by a nasty case of the powdery mildew. I went to my local hydroponics store and picked up a batch of Garden Cure which I'm intending to use at the manufacturer's default dosage. My girls are exploding with white pistils, but only a few have receded to form buds, so would it be safe to say that spraying my girls down once or twice within the next two weeks is safe? Any feedback would be greatly appreciated

Decided to take a leap of faith and sprayed my filthy young ladies down. Hoping for the best, Garden Cure is supposed to get rid of powdery mildew AND prevent botyris (which is the main reason why sprays aren't used on flowering plants). Humidity was raised to about 80% after the spray during heavy flower, hopefully Garden Cure does what it's supposed to do!