Strawbs .. What now !

Just for once I'd like something to grow without coming down with plague.

I dug up the strawberry bed at the start of the year as it was about as productive as I am on a Friday afternoon  I saved about a dozen on the runners for a tower in the greenhouse, and whilst they're in flower at the moment they aren't looking well at all.

I've been cutting of leaves looking like this for a while hoping to control whatever it is but Im ruinning out of leaves fast, time to give up on strawbs completely?

The closest match I could come up with was leaf blight and if that's the consensus they're going in the bin. Those were replacements bought for the last lot which failed to produce.