Powdery mildew orany type of mold thrives in acidic enviroments. Change the micro-enviroment into an alkalinic one and their growth is stopped and their organs collapses. Raising the tremperature to 75 degrees F is above the mold's ideal. Here's a list of products effective against mold:

AQ10
Cinnamite
Milk in a solution of 80% water and 20% skim milk (can be used repeatedly)
Neem oil
Plant Sheild
Potassium bicarbonate
Serenade
Sodium bicarbonate (baking soda) (Do not use repeatedly because it causes the build up of sodium)