Reporting
It sounds like your plants

It sounds like your plants have a bacterial disease that is causing the wilting. Often times this is due to over watering, but the disease also could have started in the seed. Unfortunately, you may have lost your plants for the season. Consult your local Cooperative Extension to get their opinion, they are the experts in your Zone, and may know if other plants have been affected in your area. Next year, practice crop rotation, and do not plant in the same spot. Good Luck! http://www.almanac.com/content/cooperative-extension-services