(1) Plants and plant parts may be registered as rootstock and top-stock sources free from viruses, virus-like agents, viroids, phytoplasmas, and bacterial pests for the propagation of certified nursery stock when inspected, tested, and found to be true-to-name and discernibly free from harmful virus and virus-like diseases by procedures outlined in this program.

(2) Certification verifies that "International Standards for Phytosanitary Measures" were implemented by an official certifying agency to ensure that the probability of the introduction of regulated pests is reduced to an acceptable level, reducing economic impacts and providing for equitable and orderly trade.

(3) This standard does not include certification of nonpest related items such as trueness-to-type and quality grades and standards.

(4) Participation in this program shall be voluntary.