Back again...Did a little checking on the Powdery Mildew problem & came up with a couple of interesting things:
Found out that farmers have been having success with milk...yes, moo juice...in fighting mildew on
plants (including Zukes). Just spray once/wk. in a 1 part milk-9 parts water solution. They say that milk is a natural fungacide. (sp?)
Did you know that Zucchini is a native of Central & South America & dates back to 7000 BC!! I didn't.
One source did recommend moving the
plants further apart.
And the mildew tends to appear where there is a high humidity. We had a very humid July, but it didn't appear until our humidity went down, so I don't know.
Let us know what happens & Good Luck!!