I will try to get a picture of it up somewhere but I have these white
> patches on my zucchini and cucumber leaves???
>
> Any ideas as to what it is or what to do?
>
> Thanks
> d
Fungus amongus
I searched
formatting link
using the term "zucchini fungus" and came up with nearly 3,000 possibilities, among the first 10 was this one. It is not 'authoritative' but should get you started.
formatting link
: both zukes and cukes are from the cucurbit family and susceptible to pretty much the same diseases. What you have is probably powdery mildew. Do a search on "powdery mildew" for the treatment. Bill