# The Seed Potatoes (Wales) Regulations 2016, Part 4: Test and trial seed potatoes


Column 1
Specified diseases or pests, damage and defects
Column 2
Individual tolerances
Column 3
Collective tolerances
Potato Tuber Eelworm (Ditylenchus destructor Thorne)
Nil
–
Potato Cyst Nematode (Globodera species infesting potatoes)
Nil
–
Ring Rot (Clavibacter michiganensis (Smith) Davis et al spp. sepedonicus (Spieck & Kotth) Davis et al)
Nil
–
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchi et al)
Nil
–
Potato Spindle Tuber Viroid
Nil
–
Colorado Beetle (Lepinotarsa decemlineata (Say))
Nil
–
Candidatus Liberibacter solanacearum Liefting et al
Nil
-
Candidatus Phytoplasma solani Quaglino et al
Nil
-
Wart Disease (Synchytrium endobioticum (Schilb) Perc)
Nil
–
Potato Cyst Nematode (Globodera species infesting potatoes)
Nil
–
Ring Rot (Clavibacter michiganensis (Smith) Davis et al spp sepedonicus (Spieck & Kotth) Davis et al)
Nil
–
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchi et al)
Nil
–
Earth or other extraneous matter
2.0%
–
Dry and wet rot, except if caused by Synchytrium endobioticum, Clavibacter michiganensis (Smith) Davis et al ssp Sepedonicus (Spieck & Kotth) Davis et al) or Ralstonia solanacearum (Smith) Yabuuchi et al)
1.0%
)
External blemishes including damaged tubers or tubers other than diseased tubers whose shape is atypical for the variety
3.0%
) 6.0%
Common Scab: tubers affected over more than one-third of their surface
5.0%
)
(1) The diseases, pests, damages and defects that are to be aggregated for a relevant group tolerance; collective group tolerance or collective tolerance are indicated by “)”.
(2) The diseases, pests, damages and defects that should not be aggregated for a relevant group tolerance; collective group tolerance or collective tolerance are indicated by “–”.
(3) Horizontal lines within a column indicate the extent of a relevant group tolerance; collective group tolerance or collective tolerance.

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Source: https://www.legislation.gov.uk/wsi/2016/106/schedule/3/part/4 (the official version)
Page: https://openlegislation.uk/seed-potatoes-wales-regulations-2016/schedule-3/part-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.