I was digging up some artichoke plants to try to over winter them inside and found that the main tuber below ground was half eaten away when I pulled them up.
What Is Eating the Tuber to My Artichoke Plants
Certified GKH Gardening Expert
There are a wide variety of pests it could be. In almost all cases, it is either a rodent or the larva of an insect. Rodents will leave teeth marks, while larva leave burrow like indentations.
If you suspect larva, treating the soil with a pesticide should take care of the problem.
With rodents, this article may help: