This is what they looked like before.

I don't know exactly, but look like some kind of blight. They're done for and I would start over, preferably a in different area maybe with different soil so they won't succumb to the same disease. Also they are a bit close together, I would sprout them in seed trays, then plant them 1 to 1.5ft apart. You could use anything as seed trays like recycled plastic containers, just poke some holes for drainage.