# The Seed Potatoes Regulations 1991, Paragraph 2


Column 1
Column 2
Column 3
Class
Requirements
Tolerances
VTSC 1
the seed potatoes shall–
(a) be grown in a crop extending to not less than 0.1 ha;
(b) be grown in a crop planted with tubers derived from stem cuttings from officially selected and tested clones which were subsequently propagated under the supervision of an authorised officer for not more than 2 years;
(c) have been kept free during the propagation period from potato viruses A, M, S, X, Y, leafroll and tobacco veinal necrosis virus or any other significant virus, and from witches' broom and blackleg; and from deviations of variety and type and groundkeepers;
(d) have been grown during the said propagation period and entered for classification by a person whose facilities, test methods, planting arrangements and manner of keeping appropriate records in relation to production of seed potatoes are acceptable to the Minister;
(e) have been grown during the propagation period and in the year entered for classification in land on an agricultural unit on which all potato crops were planted only with seed potatoes of the VTSC and SEI classes;
(f) have been kept apart at all times during the said propagation period and in the year entered for classification from potatoes of a class lower than Super Elite 1.
VTSC 2
The seed potatoes shall be grown in a crop planted with tubers derived from stem cuttings from officially selected and tested clones which were subsequently propagated under the supervision of an authorised officer for not more than 3 years; or seed potatoes der ived from a stock which was classified as VTSC 1 in the year preceding the planting of the crop.
Other requirements as in (a), (c), (d), (e) and (f) of Class VTSC 1.
Super Elite 1(Se1)
The seed potatoes shall be seed potatoes derived from a stock which was classified as VTSC1 or VTSC2 in the year preceding the planting of the crop.
(i) deviations from variety and type and groundkeepers–0.05%.
(ii) severe mosaic (including tobacco veinal necrosis virus infection)–nil.
(iii) leafroll–0.01%
(iv) mild mosaic–0.05%
(v) blackleg–0.25%
Super Elite 2 (SE2)
The seed potatoes shall be seed potatoes derived from a stock which was classified as SE1 in the year preceding the planting of the crop.
As for Class SE1 potatoes.
Super Elite 3 (SE3)
The seed potatoes shall be seed potatoes derived from a stock which was classified as SE2 in the year preceding the planting of the crop.
As for Class SE1 potatoes.
Elite 1 (E1)
The seed potatoes shall be seed potatoes derived from a stock of basic seed potatoes (other than class E1, E2 or E3 or AA) classified as such in the year preceding the planting of the crop, provided that any of the above seed potatoes may also be derived from seed potatoes classified under a scheme or other arrangements referred to in paragraph 4(c)(ii) or (iii) of Schedule 1 as being seed potatoes which could be entered for the production of further seed potatoes for classification.
(i) deviations from variety and type and groundkeepers–0.05%.
(ii) leafroll and severe mosaic (including tobacco veinal necrosis virus infection)–0.1%.
(iii) mile mosaic–0.5%
(iv) blackleg–0.5%
Elite 2 (E2)
The seed potatoes shall be seed potatoes derived from a stock which was classified as E1 in the year preceding the planting of the crop.
As for Class E1 potatoes.
Elite 3 (E3)
The seed potatoes shall be seed potatoes derived from a stock which was classified as E2 in the year preceding the planting of the crop.
As for Class E1 potatoes.
AA
The seed potatoes shall be seed potatoes derived from a stock of basic seed potatoes (in the protected region other than AA) classified as such in the year preceding the planting of the crop, provided that any of the above seed potatoes may also be derived from seed potatoes classified under a scheme or other arrangements referred to in paragraph 4(c)(ii) of (iii) of Schedule 1 as being seed potatoes which could be entered for the production of further seed potatoes for classification.
(i) deviations from variety and type and groundkeepers–0.01%.
(ii) leafroll–0.25%, severe mosaic–0.25% and tobacco veinal necrosis virus infection–0.25% subject to a combined tolerance of 0.25%.
(iii) mild mosaic–1%
(iv) blackleg–1%

---
Source: https://www.legislation.gov.uk/uksi/1991/2206/schedule/3/paragraph/2 (the official version)
Page: https://openlegislation.uk/seed-potatoes-regulations-1991/schedule-3/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.