Disease of pepino melon
I don't know if anyone can help me, but i'm really worried about my pepino melon. It's developed some kind of white scaly spots which started on the stems and then spread to the leaves - in some cases along the veins, in others on the leaf blade. The spots started off small and white (not coming off on my fingers when I brush them) and now are getting bigger and browner (almost like the leaf flesh is disappearing), with black spots on the underside of the leaf. I thought it was powdery mildew and bought a special fungicide but the problem just seems to be getting worse. The leaves are looking discoloured and are curling up, and there are strange patches dying off. I've googled lots but am struggling to find out what it is.
If anyone could point me in the right direction, i'd be very grateful.