Bugger. I was hoping, what with them not being native, there wouldn't be many pathogens around for them.
Presumably it bides in a related species.
Eta Loofah. They need a long growing season if there's to be any chance of fruit. So, even if it decides to buck it's ideas up, it's left it too late.
I will try again next year. But cut the branch so it gets even more light.
I keep my amaryllis inside after the molluscs destroyed a much loved one.
I had some that flowered simultaneously and was able to cross pollinate them. Got hundreds of seeds, grew dozens of them on until my friend, who was watching them while I was on holiday, didn't water them. The sole survivor is hanging on in the kitchen. If I don't kill it, it's still a few years from flowering. I was gutted that they all died but, in hindsight, I don't know where I'd have put them all.