Making sure the ground is moist enough, keeping everything well watered,
might get rid of the mildew without needing a fungicide.
--
Kay Easton

Ah! that explains it! I have very free draining soil which dries to a dust
if I'm not careful, so with the dry weather we've been having no wonder its
bad this year!

will spraying and watering restore the leaves to their shiny state?

chaz