PDFWAC 16-350-025
Requirements for registered scion blocks.
(1) The department will assign a registration number to each registered scion tree.
(2) Only registered trees are permitted in a registered scion block.
(3) Isolation requirements.
(a) Prunus trees must be at least one hundred feet from any nonregistered Prunus tree.
(b) Chaenomeles, Cydonia, Crataegus, Malus, Pyrus, and Sorbus trees must be at least sixty feet from any nonregistered plant of the Rosaceae family. 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.
(4) The ground in a scion block and for a distance of twenty feet on all sides around it must be kept either clean cultivated or in ground cover relatively free of broadleaf weeds.
(5) Registered scion trees must be propagated from foundation scion wood obtained from NRSP-5 or other equivalent sources approved by the department and rootstock that complies with the requirements established in this chapter, except:
(a) Registered scion trees of the genus Malus may be propagated with scion wood from other registered Malus trees, if all of the following three conditions are complied with:
(i) No registered tree utilized is more that two generations from the foundation source.
(ii) The registered tree providing scion wood for a second generation registered tree is identified and its location is known.
(iii) The department monitors the propagation of second generation registered scion trees.
(b) Registered scion trees may be propagated from trees that have been indexed and found free of all known virus and virus-like diseases by NRSP-5 or other programs approved by the department using equivalent indexing methods.
[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.]