Our cucumbers are growing great till a week ago now a whole vine is yellowing. It has tons of flowers but very few baby cucks. It is not an insect problem!!!!
Cucumber Vine is yellowing ?
What has the weather been like? Could it be heat or water (too much / too little)?
i know that the heat has really been putting the stress on my cukes lately, they cant hardly go a day without getting limpy leaves, and then they firm back up in the evening.
Mine do the same, wilt in the peak midday sun then perk back up in the early evening.
Old age? Enough squash bugs can also suck the life out of them.
Have you checked for cucumber beetles on your plants? They can quickly spread disease and kill the plants.