Lionessence said:Did I do too much?
Yes, you did too much. No, not a disease. You burnt the leaves right off of them. There's not much you can do to "roll back" as the manure and compost have been watered in and absorbed by the grapes.
Time will tell if they will survive. Next time, use just the compost, keep it about 12 inchs from the plants. Add the manure to the compost pile.