In the south we get freezes, heat, humidity, powdery mildew and spider mites. smites can be a bitch on 20 ft plants. I am going to need a good sprayer for the tractor to remain organic. The extension agent told me not to even bother with staying organic in the south. Not for hops or grapes. I plan doing an organic preventative spray every 14 days. Hope not to have to get out the heavy stuff.