what is killing my vegetable plants

Question

They were planted 2 days ago and now they look like they have been zapped.

Answer 1

It sounds like transplant shock. This article will help:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

If you grew them from seed, they may be suffering from sunscald. In the future, this can be prevented by acclimated the seedlings before planting them out:
https://www.gardeningknowhow.com/garden-how-to/seeds/how-to-harden-off-your-seedlings.htm