# The Seed Potatoes Regulations (Northern Ireland) 2016, Paragraph 3: Allowable Surface area cover


(1) This paragraph applies, for the purposes of regulation 10(3)(b), to seed potatoes to which Table 1 or 2 applies.
(2) Subject to sub-paragraph (3), an authorised officer may deem any seed potato not to be affected by Skin Spot, Black Scurf, Powdery Scab or Common Scab if, in the officer's opinion—
(a) the surface area of the potato affected by the disease is less than the percentage surface area in the entry corresponding to the disease; and
(b) the potato has at least two eyes at the rose end wholly unaffected by the disease.
(3) Sub-paragraph (2) does not apply when the disease Powdery Scab takes its cankerous form.
Table 1
Pre-basic seed potatoes
Diseases, pests, damage and blemishes
Tolerances
Allowable surface cover (% area)
(a) Group I
(i) Wart Disease
Nil
(ii) Potato Cyst Nematode
Nil
(iii) Ring Rot
Nil
(iv) Brown Rot
Nil
(v) Potato Tuber Eelworm
Nil
(vi) PSTVd
Nil
(vii) Colorado Beetle
Nil
(viii) Dickeya
Nil
(ix) Candidatus Liberibacter solanacearum (Liefting et al.)
nil
(x) Candidatus Phytoplasma solani (Quaglino et al.)
nil
(b) Group II
(i) Rots (other than Ring Rot or Brown Rot)
0.2%
(ii) Black Scurf
1%
10%
(iii) Common Scab
5%
33%
(iv) Powdery Scab
1%
10%
(v) Skin Spot
0.2%
(vi) Shrivelled tubers due to excessive dehydration or dehydration caused by Silver Scurf
0.5%
(vii) External blemishes including misshapen or damaged tubers
3%
(viii) Earth and extraneous matter
1%
(ix) Total percentage of seed potatoes covered by tolerances in points (i) to (vii) in Group II
6%
Table 2
Basic seed potatoes
Diseases, pests, damage and blemishes
Tolerances
Allowable surface cover (% area)
(a) Group I
(i) Wart Disease
Nil
(ii) Potato Cyst Nematode
Nil
(iii) Ring Rot
Nil
(iv) Brown Rot
Nil
(v) Potato Tuber Eelworm
Nil
(vi) PSTVd
Nil
(vii) Colorado Beetle
Nil
(viii) Dickeya
Nil
(ix) Candidatus Liberibacter solanacearum (Liefting et al.)
nil
(x) Candidatus Phytoplasma solani (Quaglino et al.)
nil
(b) Group II
(i) Rots (other than Ring Rot or Brown Rot)
0.5% (of which wet rot shall not exceed 0.2%)
(ii) Black Scurf
5%
10%
(iii) Common Scab
5%
33.3%
(iv) Powdery Scab
3%
10%
(v) Skin Spot
2%
12.5%
(vi) Shrivelled tubers due to excessive dehydration or dehydration caused by Silver Scurf
1%
(vii) External blemishes including misshapen or damaged tubers
3%
(viii) Earth and extraneous matter
1%
(ix) Total percentage of seed potatoes covered by tolerances in points (i) to (vii) in Group II
6%

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Source: https://www.legislation.gov.uk/nisr/2016/190/schedule/3/paragraph/3 (the official version)
Page: https://openlegislation.uk/seed-potatoes-regulations-northern-ireland-2016/schedule-3/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.