(a) Field means the entire area occupied by one variety and one seed source of potatoes and which is covered by one inspection report. Fences, ditches, highways or strips planted to other crops may run through the field provided the separation is not excessive and other conditions are similar.

(b) Seed lot means a unit of tubers or plants increased clonally from a single source of tubers or plants. If two or more seed lots are commingled in the field or in storage, seed lots shall be classified at the lowest acceptable seed class or shall be rejected from certification as appropriate.