# The Seed Potatoes (Wales) Regulations 2016, Part 2: Seed potatoes capable of being marketed as basic seed potatoes


In the course of making a determination for the purposes of paragraph 1(b) of Schedule 1, where an authorised officer determines that seed potatoes are capable of being marketed as basic seed potatoes, that officer may grade them as being seed potatoes of any of the GB grades specified in column 1 of Table 2 where that officer is satisfied following inspection that the requirements specified in column 2 in relation to that grade have been met and that the tolerances specified in column 3 have not been exceeded in respect of those seed potatoes.
Table 2
Column 1
Column 2
Column 3
GB grade
Requirements
Tolerances
S
(1) The seed potatoes must be derived from—
(i) Deviations from variety and type or different variety, including groundkeepers - 0.1%
(a) a stock of pre-basic seed potatoes or a stock which was graded as GB grade S or equivalent grade of field generation four or less in the year preceding the planting of the crop; or
(b) such other seed potatoes as are notified in writing by the Welsh Ministers as being acceptable to the Welsh Ministers
(ii) Potato viruses Y, A and leaf roll either individually or in combination - 0.02%
(2) The maximum number of field generations, including previous generations at pre-basic grade, is five.
(iii) Total virus including other mosaic viruses and potato viruses Y, A and leaf roll – 0.2%
(iv) Blackleg – 0.1%
SE
(1) The seed potatoes must be derived from—
(i) Deviations from variety and type or different variety, including groundkeepers -0.1%
(a) a stock of pre-basic seed potatoes or a stock which was graded GB grade S, GB grade SE or equivalent grade field generation five or less in the year preceding the planting of the crop; or
(b) such other seed potatoes as are notified in writing by the Welsh Ministers as being acceptable to the Welsh Ministers
(ii) Potato viruses Y, A and leaf roll either individually or in combination - 0.1%
(2) The maximum field generations, including previous generations at pre-basic or basic grade, is six.
(iii) total virus including other mosaic viruses and potato viruses Y, A and leaf roll – 0.5%
(iv) Blackleg – 0.5%
E
(1) The seed potatoes must be derived from—
(i) Deviations from variety and type or different variety, including groundkeepers - 0.1%
(a) a stock of pre-basic seed potatoes or a stock which was graded as GB grade S, GB grade SE or equivalent grade in the year preceding the planting of the crop;
(b) a stock of pre-basic seed potatoes or a stock which was graded as GB grade S, GB grade SE, GB grade E or equivalent grade field generation six or less in the year preceding the planting of the crop; or
(ii) Potato viruses Y, A and leaf roll either individually or in combination - 0.4%
(c) such other seed potatoes as are notified in writing by the Welsh Ministers as being acceptable to the Welsh Ministers.
(iii) Total virus including other mosaic viruses and potato viruses Y, A and leaf roll - 0.8%
(2) The maximum field generations, including previous generations at pre-basic or basic grade, is seven.
(iv) Blackleg – 1.0%

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Source: https://www.legislation.gov.uk/wsi/2016/106/schedule/4/part/2 (the official version)
Page: https://openlegislation.uk/seed-potatoes-wales-regulations-2016/schedule-4/part-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.