Timothy wrote:

...This is great information. Thanks for clarifying this for me. I have a few
customers who would like to try such a spray but I've never been able to
find concrete evidence on it's effectiveness and use. Have these studies
been published on the net? If so, could you point me to them? ...


Try google ["powdery mildew" milk]

You'll get a lot of stuff, much of it looks like short blurbs for
magazines or newsletters, but some of it will have real references. I'm
going to see if our extension service can put something out on the
subject.