(1)  "Virus infected (affected)  " means the presence of a harmful virus(es)  in a plant or plant part.

(2)  "Virus-like" means a disorder of genetic or nontransmissible origin and also includes mycoplasma-like organisms and rickettsia-like organisms.

(3)  "Off-type" means not true-to-name.

(4)  "Indicator plant" means any herbaceous or woody plant used to index or determine virus infection.

(5)  "Index" means to determine virus infection by means of inoculation from the plant to be tested to an indicator plant or by any other method.

(6)  "Registered tree" means that a registration number has been assigned by the department to a tree or clonal planting that has been inspected and tested in accordance with the provisions of this program.

(7)  "Scion-block" means a planting of registered trees which serves as a sources of scionwood from the propagation of "Montana certified fruit tree nursery stock".

(8)  "Seed-block" means a planting of registered trees which serves as a source of seed for producing root-stock used in the propagation of "Montana certified fruit tree nursery stock".

(9)  "Stool-bed" means a clonal planting of self-rooted registered trees for the specific purpose of producing vegetatively propagated rootstock used in the propagation of "Montana certified fruit tree nursery stock".

(10)  "Montana certified fruit tree nursery stock" means nursery grown seedlings, clonal rootstocks originating from registered trees and nursery grown trees propagated by using top-stock from registered trees and rootstock originating from registered trees except as herein provided for certain rootstocks.

(11)  "Montana certified fruit tree seed" means seed produced on registered seed trees or commercial seed having been tested and found to have a transmissible virus content that does not exceed five percent.