Probably cucumber Beetles. Look at the bottom of the leaves towards evening. Pick off any beetles that you see.

I am sorry Jean I think I need to get another camera that can focus closer, this doesn't so it is not close enough. I will transplant then each one alone. But look at this one, see the areas that have spots, they become holes. Like the hole you see more to the left in the middle. All the leaves are doing that and not growing well. I am trying to avoid too much quimicals, I am using fish emulsion right now, 1/2 spoon per water galoon is that enough?

I'm no expert by any means but this happens to any cucumber or squash plant I have ever planted as it gets hotter and hotter and as the plant begins to wind down so to speak. I've never had one stay healthy looking for long.

Angular fungus looks like that. It doens't cross veins so it has that pattern. I would cut off the affected leaves. Once they turn brown they aren't making food for the plant.