"Travis" wrote in message
Here are several remedies.
http://www.rnzih.org.nz/pages/powdery-mildew.htm

--
Thanks, Travis, that's interesting, especially that it's host specific.

Funny though, we've had the wettest summer on record and masses of rain yet
the mildew is as healthy as ever!

I don't get any mildew on any other plant - in the open or under glass.

Mary