this is a day photo
RayR, I think you are right, it's nitrogen deficient. When I had yellowing leave on my melon and cucumber (which I think are related to zucchini) I have it the bat guano high, the high nitrogen type and they greened up. I will give it a little more today and see what happens. I just don't want to overdose it...
Why do you think it has a fungus? The yellow zucchini did not have those brown spots until I accidentally broke it off the plant.
The plant is in a 5 gallon bucket with soil manure mix. I do not have a consistent watering schedule. I thought I should give it more than my other plants because it is the biggest, so I flood it about once a day. I've given it bat guano and bone meal.
For fun, this is my garden:
