Thanks for your help Stinky. I will look into those ideas. Do you know if SMC leaf wash or the bomb have any effect on lowering the occurance of powdery mildew?

How is it that an Organic Pestacide can have so many frightening warnings attached to it? Why does it say organic on it and then be called a chemical on the site you linked?

As the problem is fairly contained already i will definitely go for the Oil approach. Do they make organic bombs?