I use a mix of products right now to keep the plants healthy and fungus free. I have had good results so far, although I never think I have the battle won. This year I am lollypopping everything to help. Also Im not pinching any tops, to keep plants tall and open to ventilation. These products double as my bug spray too!
Right now Im using:
Serenade (bacillus subtilis)
Neem (azadiractin)
Rosenthals Organic Fungicide (rosemary, cinnamon and other essential oils)
Safergro Mildew Cure (Garlic, Corn, Garlic OIls)
Mosquito Barrier (garlic)
All these products are OMRI organic Im pretty sure. No more Eagle for this hippy (it didn't do much for prevention, just paranoia)
I also spray a calcium foliar.
The Rosenthals looks like an excellent product. Vaporizing similar mixes prevents mold in houses...a place called mold misery uses a similar approach.
Nice mix you have there