WAC 16-462-021   Requirements for registered blocks.  (1) All registered grapevines must be identified by the number assigned to the single vine source in the foundation block from which they were taken.

     (2) With the exception of practices allowed in subsections (3), (4), and (5) of this section, registered plants must be propagated directly from cuttings taken from a foundation block.

     (3) Plants propagated from a foundation block by tissue culture and grown entirely under laboratory or greenhouse conditions may serve as a source of softwood cuttings or shoot tip culture used to establish a registered block or registered grapevines.

     (4) Registered grapevines may be propagated from other registered grapevines within the same registered block for the purpose of increasing the size of the registered block or for replacement grapevines, if the mother vine was propagated directly from a foundation vine.

     (5) Participating nurseries must obtain a permit from the department to propagate registered grapevines from other registered grapevines for the purpose of establishing or increasing other registered blocks within the nursery. All of the following conditions must be complied with:

     (a) The mother vines were propagated directly from foundation vines;

     (b) Propagation occurs under controlled conditions adequate to prevent the introduction of pests; and

     (c) The mother vine is no more than two years old, or the department has determined the mother vine is free of regulated viruses.

     (6) Prior to planting registered vines, the growing area and its contiguous borders of not less than ten feet must be tested for the presence of the nematodes Xiphenema and Longidorus, which can be virus vectors. If either nematode is detected, the growing area must be fumigated in accordance with rates and practices recommended by Washington State University. This treatment must be carried out under the supervision of the department.

     (7) Registered blocks must be located at least one hundred feet from noncertified or nonregistered grapevines. This does not apply to registered stock grown in a fully enclosed greenhouse, screenhouse or laboratory, providing the facility does not contain noncertified grapevines.



[Statutory Authority: Chapters 15.14 and 34.05 RCW. 11-01-092, § 16-462-021, filed 12/15/10, effective 1/15/11; 06-19-009, § 16-462-021, filed 9/8/06, effective 10/9/06. Statutory Authority: Chapter 15.14 RCW. 02-11-100, § 16-462-021, filed 5/20/02, effective 6/20/02; 99-12-025, § 16-462-021, filed 5/25/99, effective 6/25/99.]