"Good disease management is critical to the successful production of the white potato (Solanum tuberosum L.). The potato plant is susceptible to at least 75 diseases and nonparasitic disorders, many of which consistently cause yield losses in potato production areas in the northeastern United States. Potatoes are a vegetatively propagated crop, and potato seed tubers can be an important source of disease inoculum. Several types of injury that can influence plant vigor and subsequent yields also occur on seed tubers."
"The management of many production problems depends on the identification of diseased or defective seed tubers.
The objective of this bulletin is to aid in the diagnosis of those tuber diseases and defects that most often result in production problems. Twenty selected diseases and defects that affect potato tubers and are most important to potato production in the northeastern United States are discussed. Symptoms of these diseases and disorders, as they appear on the tubers, are described and illustrated." (Zitter, T.A., Loria, R. "Vegetable Crops", Cornell University Vegetable MD Online)