First if you look closely you can see holes in the spud. This is insect damage, likely caused by a wireworm (larval form of a clickbeetle species.)
Second is a physiological damage in storage/shipping causing the black color. This is not blight or another fungus, but the tubers reaction to suboptimal storage condition (not enough O2).
There is two things going on there.
First if you look closely you can see holes in the spud. This is insect damage, likely caused by a wireworm (larval form of a clickbeetle species.)
Second is a physiological damage in storage/shipping causing the black color. This is not blight or another fungus, but the tubers reaction to suboptimal storage condition (not enough O2).
https://www.journals.uchicago.edu/doi/pdf/10.1086/333609