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 pre-basic seed potatoes, that officer may grade them as being seed potatoes of any of the Union grades specified in column 1 of Table 1 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 Union Grade | Column 2 Requirements | Column 3 Tolerances |
|---|---|---|
| PBTC | (1) The seed potatoes must— | Nil |
| (a) be derived from nuclear stock or tested tubers— | ||
| (i) that are free from Pectobacterium spp., Dickeya spp., potato viruses A, M, S X, Y, leaf roll, potato mop top virus, tobacco rattle virus and tobacco venial necrosis or any other significant virus; and | ||
| (ii) supplied by a source acceptable to the Welsh Ministers, which have been grown on a unit where no material of the species Solanaceae or other material, other than that derived from nuclear stock or tested tubers from a source acceptable to the Welsh Ministers, has been grown; | ||
| (b) have been kept free from— | ||
| (i) potato viruses A, M, S, X, Y, leaf roll, potato mop top virus, tobacco rattle virus and tobacco veinal necrosis or any other significant virus; | ||
| (ii) witches’ broom and backleg; | ||
| (iii) deviations of variety and type; and | ||
| (iv) groundkeepers; | ||
| (c) have been produced (in the case of plants and tubers) through micro-propagation in a protected facility and in a growing medium that is free from pests; and | ||
| (d) (in the case of tubers) not been multiplied beyond the first generation. | ||
| PB | (1) The seed potatoes must be derived from— | |
| (a) nuclear stock or tested tubers— | ||
| (i) supplied by a source acceptable to the Welsh Ministers, which have been grown on a unit where no material of the species Solanaceae or other material, other than that derived from nuclear stock or tested tubers from a source acceptable to the Welsh Ministers, has been grown; and | (i) Blackleg - nil | |
| (ii) that are free from Pectobacterium spp., Dickeya spp., potato viruses A, M, S X, Y, leaf roll, potato mop top virus, tobacco rattle virus and tobacco venial necrosis or any other significant virus; or | (ii) Not true to type or of a different variety, including groundkeepers 0.01% | |
| (b) a stock graded as Union grade PB of a previous field generation in the year preceding the planting of the crop; or | (iii) Potato viruses Y, A and leaf roll - nil | |
| (c) such other seed potatoes as are notified in writing by the Welsh Ministers as being acceptable to the Welsh Ministers; | (iv) Other mosaic viruses 0.1% | |
| (2)The seed potatoes must have been kept free from— | ||
| (i) potato viruses A, M, S, X, Y, leaf roll, potato mop top virus, tobacco rattle virus and tobacco veinal necrosis or any other significant virus; | ||
| (ii) witches’ broom and blackleg; | ||
| (iii) deviations of variety and type; | ||
| (iv) groundkeepers; | ||
| (v) plants of a different variety. | ||
| (3) The maximum number of field generations is four |