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 Union 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.
| Column 1 | Column 2 | Column 3 |
|---|---|---|
| Union grade | Requirements | Tolerances |
| S | (1) The seed potatoes must be derived from— (a) a stock of pre-basic seed potatoes or a stock which was graded as Union grade S of field generation four or less in the year preceding the planting of the crop; or | (i) Deviations from variety and type or different variety, including groundkeepers - 0.1% |
| (b) such other seed potatoes as are notified in writing by the Secretary of State as being acceptable to the Secretary of State. | (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— (a) a stock of pre-basic seed potatoes or a stock which was graded Union grade S or Union grade SE field generation five or less in the year preceding the planting of the crop; or | (i) Deviations from variety and type or different variety, including groundkeepers -0.1% |
| (b) such other seed potatoes as are notified in writing by the Secretary of State as being acceptable to the Secretary of State. | (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— (a) inside the protected region, a stock of pre-basic seed potatoes or a stock which was graded as Union grade S or Union grade SE in the year preceding the planting of the crop; | (i) Deviations from variety and type or different variety, including groundkeepers - 0.1% |
| (b) outside the protected region, a stock of pre-basic seed potatoes or a stock which was graded as Union grade S, Union grade SE or Union grade E 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 Secretary of State as being acceptable to the Secretary of State. | (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% |