(1) PROPAGATIVE
MATERIAL USED TO GROW THE CERTIFIED SEED POTATOES. Certified seed potatoes
shall be grown from one of the following:
(a)
Foundation seed potatoes produced, on the same farm, by the seed potato grower
requesting certification.
(b)
Foundation seed potatoes produced on another farm in this state, if
pre-approved by the college.
(c)
Propagative material produced by the college.
Note: The college produces "Elite Source" potatoes that may
be used under par. (c) to grow foundation seed potatoes. "Elite Source"
potatoes comply with all of the standards in this subchapter, and are labeled
to show the number of years of field propagation on the college farm. The
college rigidly screens the potatoes for disease, using accepted indexing
methods.
(d) Propagative
material that is pre-approved by the college and produced in a laboratory or
greenhouse approved under s.
ATCP 156.07.
(e) Foundation seed potatoes certified by
another state, under standards equivalent to those in this chapter, and
pre-approved by the college.
(f)
Propagative material produced by a breeding program that is pre-approved by the
college. The college may approve the propagative material if the college does
all of the following:
1. Finds that the
material was produced under conditions that reasonably limit the threat of
disease or variety mixture.
2.
Conducts field and harvest inspections of the propagative material, equivalent
to the inspections under s.
ATCP 156.04(1) and
(2), and finds that the propagative material
meets standards equivalent to the certification standards under s.
ATCP 156.03(3) to (5).
Note: The college may pre-approve propagative material from
a recognized breeding program, even though the program does not employ a
limited-generation scheme. Recognized breeding programs evaluate potato lines
for agronomic characteristics, and most of the lines are derived from true seed
rather than tissue culture. Seed potatoes descended from the propagative
material may be certified for a maximum of 3 years. See s.
ATCP 156.05(2).
(g) Certified seed potatoes when
specifically authorized under sub. (6) (a) 3.
Note: Sub. (6) (a) 3. allows a grower to produce foundation
seed potatoes from non-foundation certified seed potatoes under special
circumstances, when the grower is recovering from a bacterial ring rot finding
2 seasons earlier.
(2) PLANTING STANDARDS. Seed potato lots
proposed for certification shall comply with the following planting standards:
(a) Each lot shall be separated from every
other lot by at least one planting row.
(b) Each lot shall be separated by at least
50 feet from other potatoes that are not a part of a lot proposed for
certification. The college may approve a shorter separation distance if there
is adequate alternative protection against transmission of viral
disease.
(c) Lots may not be
planted on the same farm, in the same year, with any potatoes or propagative
materials except those listed in sub. (1).
(3) FIELD AND HARVEST INSPECTION STANDARDS.
(a) The college may not certify a lot of seed
potatoes if an inspection under s.
ATCP 156.04(1) or
(2) finds any disease or variety mixture in
excess of the rate specified in Table 1.
|
Table 1.
FIELD AND HARVEST INSPECTION
STANDARDS
|
|
Condition
|
1ST FIELD INSPECTION
|
SUBSEQUENT FIELD OR HARVEST
INSPECTIONS
|
|
Foundation Seed Potatoes
|
Other Seed Potatoes
|
|
Leafroll
|
1.5%
|
0.25%
|
1.0%
|
|
Mosaics
|
2.0%
|
0.25%
|
1.0%
|
|
Spindle tuber
|
0.0%
|
0.0%
|
0.0%
|
|
Total virus allowed
|
3.0%
|
0.25%
|
2.0%
|
|
Bacterial ring rot
|
0.0%
|
0.0%
|
0.0%
|
|
Variety mixture
|
1.0%
|
0.1%
|
0.1%
|
(b) The college may decline to certify a lot
of seed potatoes if any of the following apply:
1. The planted or harvested lot is materially
affected by a disease, pest infestation or condition, not identified in Table
1, which adversely affects the growth, quality or value of the seed potatoes.
Note: For example, par. (b) 1. may include diseases, pest
infestations and conditions such as late blight, soft rot, frostbite, slow
emergence, missing hills or excessive weed growth.
(4) POST-HARVEST TEST STANDARDS.
(a) Except as provided in par. (b), the
college shall deny or withdraw certification of a seed potato lot if a
post-harvest test under s.
ATCP 156.04(3) finds any disease or
variety mixture in excess of the rate specified in Table 2
|
Table 2.
POST-HARVEST TEST STANDARDS
|
|
Condition
|
Foundation seed potatoes
|
Other certified seed potatoes
|
|
Leafroll
|
0.5%
|
5.0%
|
|
Mosaics
|
0.5%
|
5.0%
|
|
Spindle tuber
|
0.0%
|
0.0%
|
|
Total virus allowed
|
0.5%
|
5.0%
|
|
Bacterial ring rot
|
0.0%
|
0.0%
|
|
Variety mixture
|
0.25%
|
2.0%
|
Note: The college must complete a post-harvest test before
certifying foundation seed potatoes. See s.
ATCP 156.04(3)
(a). The college may certify other seed
potatoes before completing a post-harvest test, but must withdraw the
certification if the post-harvest test shows a violation of standards under
sub. (4) (a).
(b) The
college may certify a lot of seed potatoes, regardless of the existence or
results of any post-harvest test under s.
ATCP 156.04(3), if all of the following
apply:
1. The lot has met the standards under
sub. (3) (a) based on field and harvest inspections under s.
ATCP 156.04(1) and
(2).
2. The college conducts reliable laboratory
tests on a representative sample of potatoes from the lot; or receives results
from equivalent tests conducted by a reliable commercial laboratory, and the
laboratory tests show that the lot complies with the post-harvest test
standards in par. (a).
(5) FOUNDATION SEED POTATOES; ADDITIONAL
STANDARDS. The college may not certify foundation seed potatoes from any farm
unless all of the following apply:
(a) The
college has conducted field and harvest inspections, under s.
ATCP 156.04(1) and
(2), of all potatoes grown on the farm in the
2 preceding years.
(b) The college
has conducted a post-harvest test of the previous year's seed potato production
from that farm under s.
ATCP 156.04(3), or has conducted
equivalent laboratory tests of that production under sub. (4) (b).
(6) BACTERIAL RING ROT; ADDITIONAL
STANDARDS.
(a) The college may not do any of
the following if the college finds that any lot of potatoes from a farm is
infected with bacterial ring rot:
1. Certify
the infected lot.
2. Certify as
foundation seed potatoes any potatoes descended from potatoes grown on the same
farm, in the same year, as the infected lot.
3. Certify as foundation seed potatoes any
potatoes grown on the same farm in the same year or the following year, except
that certified seed potatoes grown in the second year may be used to grow
foundation seed potatoes in the third year if there is no further finding of
bacterial ring rot.
(b)
If the college finds any lot of potatoes infected with bacterial ring rot, no
potatoes from that lot may be stored in a warehouse used to store certified
seed potatoes.
(c) If the college
finds bacterial ring rot in stored potatoes, the college may not certify any
lot of potatoes from the same farm until the seed potato grower does all of the
following:
1. Removes all of the infected
lots from storage.
2. Cleans and
disinfects relevant potato equipment and facilities in a manner approved by the
college.
(7)
VARIANCE ALLOWED BY COLLEGE.
(a)
Notwithstanding subs. (3) and (4), the college may certify a lot of seed
potatoes that fails to comply with one or more standards under sub. (3) or (4)
if the college documents all of the following in the certification document
under s.
ATCP 156.02(3):
1. Special conditions justify the
certification, and there is a reasonable likelihood that the next generation of
seed potatoes grown from the non-complying lot will comply with the standards
under subs. (3) and (4).
2. No
bacterial ring rot has been found in the lot.
3. The certification will not jeopardize seed
potato quality, or pose a significant risk of harm to the potato industry or
consumers.
(b) A seed
potato grower may submit a written request for certification under par. (a).
The requester shall provide information to show that the requested action would
comply with par. (a).
(c) The
college may require laboratory tests of a representative sample of the seed
potato lot for which the variance is requested.
