Hi folks! Last year my cuke crop was killed by white powdery mildew. This year my cukes have a different problem. Please take a look at pics. The vines gave us a pretty good crop but suddenly within a span of two weeks have started dying. At first I thought it may be old age but no� it is definitely some disease because one very young plant [which is only 2 ft tall] also has caught it.

I have already tried spraying Daconil every week but no improvement. I started spraying it when the first symptoms started showing.

What should I do?