Brought some plants inside and noticed powdery mildew starting, went to hydro store and they gave me something called nova which i sprayed them all really well with. Ive never dealt with wpd before and im wondering if I will have to spray them again soon? Will nova effect taste? How long before it breaks down? Plants are in day 10 of 12/12, i first sprayed them on day 8 of 12/12. Any advice would be appreciated.