Shell Rot
Box turtles as a rule are very resilient. Shell rot seems to a rare occurrence. However, it does pop up from time to time.
By far the most common cause in captivity is unclean habitats combined with cool temps. In the wild the main cause seems to be from frost damage.
The following pictures are of healed shell
rot from wild
box turtles. Click on the picture to view it full size.
Following are pictures of extensive
shell rot
that required treatment