Edgar, just for your information, you don't have to start a whole new thread when posting to your own original posting. You can keep adding to that same subject matter, and then we won't have to search around to find out what you are talking about! lol!

Username gave you a very good answer in that original post. Powdery mildew really is one of the plant diseases that is almost entirely preventable. Good luck! Perhaps you can start the 'housekeeping' chores that will help prevent a reinvestation in the spring!