603-051-0856 Definitions As used in OAR 603-051-0855 to 603-051-0859, unless the context requires otherwise: (1) "Block" means a contiguous grouping of plants separated by at least 10-feet from other contiguous groupings of plants. (2) "Clean cultivation" means the site is bare earth or is planted with a grass (Gramineae) or another crop approved in writing by the Department in which broad-leaved weeds are actively controlled. (3) "Department" means the Oregon Department of Agriculture. (4) “G1” means the original plants (nuclear materials) that have tested negative in the most extensive battery of virus tests available, and subsequently maintained in isolation to prevent (re)infection. Production and maintenance of G1 material must be in within a system approved by USDA-APHIS or its official designee. (5) “G2” means plant material that is propagated from G1 stock and maintained under the specific conditions outlined in OAR 603-051-0857 to prevent (re)infection. (6) “G3” means plant material that is propagated from G1 or G2 stock to increase the amount of source material available for producing virus-tested certified nursery stock. G3 plants must be maintained under the specific conditions outlined in OAR 603-051-0857 to prevent (re)infection. (7) “G4” means plant material that is propagated from G1, G2, or G3 stock that will be distributed for sale. When using seed for G4 rootstock production, the source of seed must be approved by the Department. (8) "Index" means to determine virus infection by means of inoculation from the plant to be tested to an indicator plant or by other scientifically acceptable means of detection. (9) "Indicator Plant" means any herbaceous or woody plant used to index or determine virus infection. (10) "Off-Type" means different from the cultivar as stated on the application for certification. (11) "Oregon Certified Nursery Stock" means G4 plant materials including nursery-grown seedlings, clonal root-stocks originating from registered G2 or G3 trees, nursery-grown trees propagated by using top-stock from registered G2 or G3 trees, and rootstock originating from registered G2 or G3 trees, but is limited to the genera Chaenomeles, Cydonia, Malus, Prunus, and Pyrus. (12) "Oregon Certified Seed" means seed produced on registered G1, G2, or G3 seed trees. (13) "Registered Tree" means a tree or clonal planting that has a registration number assigned to it by the Department, and that has been inspected and tested in accordance with the provisions of OAR 603-051-0855 to 603-051-0859. (14) "Scion-Block" means a planting of registered G2 or G3 trees, which serves as a source of scionwood for the propagation of Oregon Certified Nursery Stock. (15) "Seed-Block" means a planting of registered G2 or G3 seed trees, which serves as a source of seed for producing rootstock used in the propagation of Oregon Certified Nursery Stock. (16) "Stool Bed" means a clonal planting of self-rooted registered G2 or G3 trees for the specific purpose of producing vegetatively propagated rootstock used in the propagation of Oregon Certified Nursery Stock. (17) "Virus" means virus and virus-like pathogens including phytoplasmas, viroids, and graft transmissible agents. (18) "Virus Infected" means the presence of a harmful virus in a plant or plant part. (19) "Virus-Like" means either a genetic disorder or nontransmissible entity. (20) "Tissue culture" means a general term for the cultivation of plants (cells, tissues, or organs) under aseptic conditions in a synthetic medium in vitro. It also refers to the cultures themselves. (21) "Tested" means having been subjected to an official examination, other than visual, to determine if pests are present or to identify pests. Statutory/Other Authority: ORS 561, 571 & 632 Statutes/Other Implemented: ORS 561, 571 & 632 History: DOA 5-2013, f. & cert. ef. 3-1-13 DOA 6-2007, f. & cert. ef. 3-16-07 DOA 14-2004, f. & cert. ef. 6-1-04 AD 17-1977, f. & ef. 7-15-77