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i have been sparying serenade spray on my plants and it seems to be clearing up the powdery mildew... they're still in veg so im going to spray them once or twice a week. when should i stop using the serenade spray??

I am about 85% sure I have a mild powdery mildew problem. However the plant is still growing like there's no tomorrow with very healthy shoots and gorgeous leaves. I have heard of this technique before but I am wondering if I do this as a "just-in-case" measure, will it harm the plant at all?