Posted: 09/06/2012 at 22:45
More likely powdery mildew, it gets my cucumbers every year but not for long though.
I found this recipe online and didn't believe it would work, but it does. Mix 50/50 water and ordinary cows milk together and pour into a sprayer. Spray the leaves. Repeat about 3 times. Does not keep, so mix a fresh batch each time.
I think the trick with this one is, spray at the first sign of an attack. And I haven't a clue why or how it works, but it does.