Grub, I can't really tell from the pictures.
What do those plants look like now? Any yellowing? Do the plants seem to recover at night only to wilt again the next day?
To find out if it's a bacterial wilt, take a stem and put in a glass of water like explained in the link below. I don't think it looks like bacterial wilt, though.
http://www.plant.uga.edu/Extension/p...nbactwilt.html
Also have a look at this discussion of fusarium and verticillium wilts - reading through it and comparing specifics with what you can see on the plants might help you narrow it down.
http://ohioline.osu.edu/hyg-fact/3000/3122.html