Mildew problem

Question from Sybil

616 1

I put this in a couple of years ago to cover a new fence quickly. The first year it was fine, but this year it has suffered from powder mildew and has had no flowers. It may be in the wrong place for the fence is backed by a neighbours trees. I may just give up on it, but does anyone have any ideas for remedies. I am reluctant to spray as I have encouraged bees into the garden.