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The attached pictures are of my struggling cucumbers. There have been many years when I have had very good crops and I always do things the same way. I have had the soil tested and all the nutrients are at a good level. There is some disease on these, but I'm not sure what to do about it. I only water at the roots to try and keep the fungus down, but these plants always seem wilted by mid day, even when I water them in the morning. It has been very hot and we have not had much rain. The cucumbers that I have got have been very good, so it would be a shame to see the crop die off.
No, I haven't seen any particular insects, but I haven't looked that closely. The cucumbers are at the back of the garden so it's a bit difficult to get close up. Tomorrow I will look more carefully.
You appear to have cucumber bacterial wilt which is spread by the cucumber beetle. There don't have to be a lot of them to cause the damage. They carry the bacteria. Here is a link so you can compare:
