please identify cucumber problem
Hello, I am having a problem on some of the leaves of my cucumber. Please see pic. This started near the ground and is moving up. It seems to be limited to the longest vine (or whatever it's called, I don't mean one plant). I see some black beetles about 1/4" long here and there but they are not concentrated on the affected leaves.
What is this and what can I do about it?
(I also posted this in Oklahoma Gardening on this site but not getting any answers.)