(1) Inspections will be made only by the department and at times when specific diseases are most likely to be expressed.

(2) At the request of the department, any undesirable rootstock shall be rogued before propagation. At least one visual inspection shall be made of nursery rootstock in a planting for certification during the first growing season. At least two visual inspections shall be made during the growing season following bud or graft placement and for transplants or second and third year seedlings for all certified nursery stock.

(3) The department shall refuse certification in part or all of a planting if plants have been propagated from registered trees determined to be affected by a virus or virus-like disease or if other requirements of this program have not been met.