(a) The certifying agency may deny certification as foundation seed to any field or seed lot which, in its opinion, would be likely to produce potatoes unsuitable for foundation stock. For example, certification may be denied because of poor cultural practices, such as inadequate weed or blight control, which interfere with disease identification.

(b) All classes of foundation seed shall have a tolerance of 0.25 percent for varietal mixture.

(c) Requirements with respect to matters not specifically covered in the Seed Potato Certification Standards for Foundation Classes in this Part shall be the same as for certified class seed.

Each grower shall keep a record of persons from whom foundation seed was purchased. These records shall be available for examination by the official certifying agency or New York State Department of Agriculture and Markets represent active upon request. Such records shall include variety, quantity, field number(s) and other pertinent certification documents.