- (1) The department will assign a registration number to each registered scion tree.
- (2) Only registered G2 or G3 trees are permitted in a registered scion block.
(3) Isolation requirements. Prunus trees must be at least 100 feet from any nonregistered Prunus tree and any nonregistered members of the Rosaceae family.
- (a) Plant genera Amelanchier,Chaenomeles, Cydonia, Crataegus, Malus, Pyrus, and Sorbus trees must be at least 60 feet from any nonregistered plant of the Rosaceae family.
- (b) The department may waive the isolation distance for registered trees of these genera, if the trees are separated by a physical barrier that would prevent the intermingling of roots.
- (c) The department may waive the isolation distances for registered tissue culture lines of these genera, if kept under sterile laboratory conditions or an indoor insect proof facility.
- (4) The ground in a scion block and for a distance of 20 feet on all sides around it shall be kept clean cultivated or in grass (Gramineae) or another approved cover in which broad-leaved weeds are actively controlled.
- (5) The rootstock and scion sources of the G2 and G3 scion-block trees shall have originated from G2 trees established under this certification program or from virus-tested G1 trees originating through the National Clean Plant Network-FT or other department-approved virus-tested sources. If the tree is scion-rooted, its source shall have met the above-mentioned requirements.
(6) Registered scion trees may be propagated with scionwood from other registered trees, if all of the following conditions are complied with:
- (a) No registered tree utilized is more than two generations from the foundation source.
- (b) The registered tree providing scionwood for a second-generation registered tree is identified and its location is known.
- (c) The department monitors the propagation of second-generation registered scion trees.
[Statutory Authority: RCW 15.14.015. WSR 26-10-008, s 16-350-025, filed 4/27/26, effective 5/28/26. Statutory Authority: Chapter 15.14 RCW. WSR 00-19-036, § 16-350-025, filed 9/12/00, effective 10/13/00; WSR 90-23-006 (Order 2058), § 16-350-025, filed 11/9/90, effective 12/10/90; Order 1331, § 16-350-025, filed 1/15/74; Order 1300, § 16-350-025, filed 3/26/73; Order 951, Regulation 2(b), filed 7/2/64; Order 890, Regulation 2 (part), effective 9/17/62.]