

Here's my contender #2 and a big, beautiful blossom taken after last night's two inches of rain.
Pruning allow better management of your crop, andit will also encourage the plant to devote it's energies towards fruit growth.
The main vine should be pruned when it reaches ten to fifteen feet beyond the last fruit you are leaving on the plant. Secondary vines (or runners) should be trimmed when they reach ten to twelve feet from the main vine.
Trimming a vine is simple. Cut the vine at the end and bury the end by placing a shovelful or two of soil over the cut end. Burying the vine is recommended, but not essential. It will minimize moisture loss while the cut is fresh and minimize the possibility of disease entering through the wound.
After pruning the vines, you will likely experience a proliferation of new vines. There will be new runners off the main vine and new runners on the runners. This is the same as when you trim a bush or hedge row. The result is a bushier, healthier plant.
Continue to pinch off any new growth beyond the limits recommended above and the plant will turn it's energy towards fruit growth. A little extra potassium and a little less nitrogen will further encourage the fruit growth as opposed to vine and leaf growth.
If you don't trim the vines, the overall health of your plant will not be affected. But, you are not doing anything to enhance fruit growth which after all is the endgame. In addition, your patch will look unruly which may or may not bother you.....your call.