Tomato Transplants Wilted and Died. Disease?

Q. Last weekend I started putting some tomatoes into raised garden beds. I had started these from seed about 8 weeks ago, transplanted them once into 20 oz plastic cups after four weeks, and hardened them off for a week before putting them in the ground. The were 4-6 inches tall. They went into good topsoil and I fertilized them lightly with Miracle Gro for tomatoes. Within about five days they started wilting from the bottom up and two are completely dead. I've noticed white lesions on several of the stems. Photos attached. Could this be blight? Is there a chance I overfertilized? I haven't seen any insects on the plants.