ATCP 156.03(4)(b)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).

ATCP 156.03(5)(5) Foundation seed potatoes; additional standards. The college may not certify foundation seed potatoes from any farm unless all of the following apply:

ATCP 156.03(5)(a)(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.

ATCP 156.03(5)(b)(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).

ATCP 156.03(6)(6) Bacterial ring rot; additional standards.

ATCP 156.03(6)(a)(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:

ATCP 156.03(6)(a)2.2. Certify as foundation seed potatoes any potatoes descended from potatoes grown on the same farm, in the same year, as the infected lot.

ATCP 156.03(6)(a)3.3. 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.

ATCP 156.03(6)(b)(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.

ATCP 156.03(6)(c)(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:

ATCP 156.03(6)(c)2.2. Cleans and disinfects relevant potato equipment and facilities in a manner approved by the college.

ATCP 156.03(7)(7) Variance allowed by college.

ATCP 156.03(7)(a)(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):

ATCP 156.03(7)(a)1.1. 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).

ATCP 156.03(7)(a)3.3. The certification will not jeopardize seed potato quality, or pose a significant risk of harm to the potato industry or consumers.

ATCP 156.03(7)(b)(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).

ATCP 156.03(7)(c)(c) The college may require laboratory tests of a representative sample of the seed potato lot for which the variance is requested.

ATCP 156.04(1)(1) Field inspection. Before the college certifies a lot of seed potatoes, the college shall conduct at least 2 field inspections of the farm on which that lot is being grown. The college shall visually inspect at least 100 potato plants per acre of plants from which the lot is produced, and may inspect any other potato plants growing on the farm. The inspection of a potato plant may include a visual inspection of the plant and any tubers from the plant. The college shall inspect potato plants for compliance with the standards in s. ATCP 156.03 (2) and (3).

ATCP 156.04(2)(2) Harvest inspection. Before the college certifies a lot of seed potatoes, the college shall visually inspect a representative sample of harvested tubers chosen from that lot. The college shall choose the tubers at harvest, or after the tubers have been harvested and stored. The college shall visually inspect at least 100 tubers for each harvested acre of tubers comprising the lot, and may inspect any other tubers harvested from the farm. The college shall inspect tubers for compliance with the standards under s. ATCP 156.03 (3).

ATCP 156.04(3)(3) Post-harvest test.

ATCP 156.04(3)(a)(a) Except as provided in par. (b) or s. ATCP 156.03 (4) (b), the college shall conduct a post-harvest test on each lot of certified seed potatoes. The college shall conduct the post-harvest test according to par. (c). The college may not certify foundation seed potatoes until it completes the post-harvest test, but may certify other seed potatoes before completing the post-harvest test.

ATCP 156.04 NoteNote: The college must perform a post-harvest test before certifying foundation seed potatoes. 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 s. ATCP 156.03 (4).

ATCP 156.04(3)(b)(b) No post-harvest test is required under par. (a) if the certified lot will be planted in the following season on fewer than 0.25 acres and only on the grower’s own farm.

ATCP 156.04(3)(c)(c) For a post-harvest test under par. (a), the grower shall deliver to a location specified by the college a representative sample of 400 tubers for every 50 acres from each lot to be certified, with a maximum of 4 samples per lot. Each tuber shall be 1¾ to 2¼ inches in diameter and no more than 2½ inches long. The college shall plant the tubers in a winter growing location chosen by the college. The college shall inspect the potato plants and potatoes grown from those tubers for compliance with the standards under s. ATCP 156.03 (4) (a).