Current through Register Vol. 24-06, March 15, 2024
(1) A
grower may not recertify any seed lots, except nuclear, if ring rot has been
detected on his or her seed potato farm during the previous two years. Nuclear
seed potatoes may be recertified by the original grower if laboratory testing
of the seed by a laboratory approved by the department shows negative results
for ring rot.
(2) Prenuclear class.
(a) Prenuclear seed lots must be derived from
disease tested micropropagated plants. All testing methods and laboratories
must be approved by the department.
(b) A minimum of one percent (and not less
than twenty samples) of prenuclear seed produced in a greenhouse must be tested
and found free of potato virus X (PVX), potato virus Y (PVY), potato virus S
(PVS), potato leafroll virus (PLRV), Erwinia carotovora ssp.
caratovora (soft rot), Erwinia carotovora
ssp. atroseptica (black leg), and Clavibacter
michiganense ssp. sepedonicus (ring rot).
(c) The department will inspect all
facilities used in the production of prenuclear class seed potatoes on a
periodic basis. Department approval is necessary in order to utilize these
facilities.
(3) Nuclear
class.
(a) Nuclear class seed potatoes must
be propagated entirely from prenuclear plants.
(b) Each nuclear class seed lot must be
distinctly separated in storage and in the field.
(c) If a ground rig is used for spraying,
wide enough spacing between rows must be left, so that tires will not touch
plants during the growing season.
(d) Growers must plant cut seed and single
drop seed separately, with single drop seed identified.
(4) Generations 1, 2, 3, 4 and 5.
(a) Growers must leave a distinct separation
between lots of seed potatoes from different classes. The same separation must
be left between different varieties, unless the varieties are readily
distinguishable by visual observation. The separation must consist of one of
the following:
(i) A strip of land at least
six feet in width, that is unplanted or planted with another crop; or
(ii) Visible markers such as flags in every
corner of the lot, and also at intervals not to exceed one hundred
yards.
(b) When more
than one lot of seed potatoes is planted in the same field, growers must stake
or mark the identity of each lot.
Statutory Authority:
RCW
15.14.015 and
chapter
34.05 RCW. 13-12-014,
§ 16-324-385, filed 5/24/13, effective 6/24/13. Statutory Authority:
Chapters 15.14 and
34.05 RCW. 08-10-039, §
16-324-385, filed 4/30/08, effective 5/31/08; 07-11-010, § 16-324-385,
filed 5/3/07, effective 6/3/07. Statutory Authority: Chapter 15.14 RCW.
00-20-070, § 16-324-385, filed 10/3/00, effective
11/3/00.
