I have about 8 zucchini plants, about 6- 8 weeks along, which are starting to show signs of disease on the leaves.
It's definitely not powdery mildew, but the end result is quite similar. Leaves are getting yellowish patches which then develops brown spots and eventually the whole leaf turns yellow.
So far only some of the first leaves have turned yellow, but I can see it has spread to some of the larger leaves.
We've had unseasonal excessive rain over the past few months, which I assume is the cause of disease and helping to keep it spreading.
Does this sound like it can be treated and how? or Should I just remove the plants and plant something more suitable to the current weather?