I have several netted melon plants which are in my greenhouse in somerset . They have been growing nicely and we have several grapefruit sized melons on them .
Watering has been consistent and ventilation good & temperatures normal for U.k summer , all was well but over the last week the leaves have started to go as below :-
The leaves start to go brown around the edges first then spreads to the whole leaf , veins and stem & fruits seem unaffected .Some of the fruits have started to go prematurely yellow as well ,as if the plant can't provide for them anymore.
I'm wondering if its downy mildew , but not sure . Either way could you give me your opinion on what you believe it to be and any possible cure .