Cucumber plant vines dying
I can't really tell from these photos. It mostly looks like spider mite damage to me. But, there are a lot of cucumber diseases as well.
At this point, I would recommend pulling out your vines that are showing damage and replanting for the fall. But I would put something else in that spot and plant your cucumbers somewhere different so that you can have some crop rotation benefits.
Let me know if I can assist you further.