# The Seed Potatoes (Scotland) Regulations 2000, Paragraph 5: Allowable surface area cover


(1) This paragraph applies, for the purposes of regulation 13(1)(b), to seed potatoes to which Table II, III, IV or V applies.
(2) Subject to paragraph (3), an authorised officer may deem a potato in any sample of seed potatoes to which this paragraph applies not to be affected by a disease in Group III, set out in column 1 of the Table applicable to a potato of that class when, in his 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 in column 5 of the Table; and
(b) the potato has at least two eyes at the rose end wholly unaffected by the disease.
(3) Paragraph (2) shall not apply when the disease Powdery Scab (Spongospora subterranea(Wallr.) Lagerh) takes its cankerous form.
TABLE I
PRE-BASIC TC CLASS
Column 1
Column 2
Diseases, pests, damage and defects
Individual Tolerances
GROUP I
Wart Disease (Synchytrium endobioticumSchilb.)
NIL
Potato Tuber Eelworm (Ditylenchus destructorThorne)
NIL
Potato Cyst Nematode (Globoderaspecies infesting potatoes)
NIL
Ring Rot (Clavibacter michiganensis(Smith) Davis et al ssp.
NIL
Sepedonicus (Spieck Kotth) Davis et al)
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchi et al)
NIL
Potato Tuber Moth (Phthorimaea operculella (Zell)
NIL
Potato Spindle Tuber Viroid
NIL
Colorado Beetle (Leptinotarsa decemlineata (Say))
NIL
GROUP II
Blight (Phytophthora infestans (Mont) de Bary)
NIL
Blackleg (Erwinia carotovora Jones) Bergey et al ssp atroseptica
NIL
(Hellmers & Dowson) Dye) or Erwinia chrysanthemi Burkholder et al or both
Gangrene/ Dry Rot/Wet Rot
NIL
Frost damaged tubers
NIL
GROUP II
Skin spot (Polyscytalum pustulans (Owen & Wakefield) M. B. Ellis
NIL
Black scurf (Rhizoctonia solani Kuhn)
NIL
Common scab (Streptomyces species)
NIL
Powdery scab (Spongospora subterranea (Wallr) Lagerh)
NIL
GROUP IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety
3%
GROUP V
Dirt or other extraneous matter
1%
TABLE II
PRE-BASIC 1 AND PRE-BASIC 2 CLASS
Column 1
Column 2
Column 3
Column 4
Column 5
Diseases, pests, damage and defects
Individual tolerances
Group Tolerances
Collective group tolerances
Allowable % surface area cover
GROUP I
Wart Disease (Synchytrium endobioticumSchilb.)
NIL
–
–
Potato Tuber Eelworm (Ditylenchus destructorThorne)
NIL
–
–
Potato Cyst Nematode (Globoderaspecies infesting potatoes)
NIL
–
–
Ring Rot (Clavibacter michiganensis (Smith) Davis et al ssp. Sepedonicus (Spieck Kotth) Davis et al)
NIL
–
–
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchi et al)
NIL
–
–
Potato Tuber Moth (Phthorimaea operculella (Zell)
NIL
–
–
Potato Spindle Tuber Viroid
NIL
–
–
Colorado Beetle (Leptinotarsa decemlineata (Say))
NIL
–
–
GROUP II
Blight (Phytophthora infestans (Mont) de Bary
0.1%
0.2%
Blackleg (Erwinia carotovora (Jones) Bergey et al ssp atroseptica (Hellmers & Dowson) Dye) or Erwinia chrysanthemi Burkholder et al or both
Nil
0.2%
4.0%
Gangrene/ Dry Rot/Wet Rot
0.1%
0.2%
4.0%
Frost damaged tubers
0.1%
0.2%
4.0%
GROUP III
Skin spot (Polyscytalum pustulans (Owen & Wakefield) M. B. Ellis
0.2%
3.0%
4.0%
Black scurf (Rhizoctonia solani Kuhn)
0.5%
3.0%
4.0%
12.5%
Common scab (Streptomyces species)
3.0%
3.0%
4.0%
25.0%
Powdery scab (Spongospora subterranea (Wallr) Lagerh)
0.5%
3.0%
4.0%
12.5%
GROUP IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety
1.0%
4.0%
GROUP V
Dirt or other extraneous matter
1.0%
TABLE III
VTSC CLASS AND EQUIVALENT IN OTHER PARTS OF THE UK
Column 1
Column 2
Column 3
Column 4
Column 5
Diseases, pests, damage and defects
Individual tolerances
Group Tolerances
Collective group tolerances
Allowable % surface area cover
GROUP I
Wart Disease (Synchytrium endobioticum (Schilb) Perc.)
NIL
–
–
Potato Tuber Eelworm (Ditylenchus destructor Thorne)
NIL
–
–
Potato Cyst Nematode (Globodera species infesting potatoes)
NIL
–
–
Ring Rot (Clavibacter michiganensis (Smith) Davis et al ssp sepedonicus (Spieck. & Kotth.) Davis et al)
NIL
–
–
Brown Rot (Ralstonia solancearum (Smith) Yabuuchi et al.)
NIL
–
–
Potato Tuber Moth (Phthorimaea operculella (Zell)
NIL
–
–
Potato Spindle Tuber Viroid
NIL
–
–
Colorado Beetle (Leptinotarsa decemlineata (Say))
NIL
–
–
GROUP II
Blight (Phytophthora infestans (Mont.) de Bary
0.5%
0.5%
4.0.%
Blackleg (Erwinia carotovora (Jones) Bergey et al. ssp atroseptica (Hellmers & Dowson) Dye) or Erwinia chrysanthemi Burkholder et al or both
NIL
0.5%
4.0.%
Wet Rot including: Watery Wound Rot (Pythium ultimumTrow)
0.5%
0.5%
4.0.%
Pink Rot (Phytophthora erythroseptica Pethybridge) and Pit Rot
0.5%
0.5%
4.0.%
Dry Rot (Fusarium species)
0.5%
0.5%
4.0.%
Gangrene (Phoma species)
0.5%
0.5%
4.0%
Frost damaged tubers
0.5%
0.5%
4.0.%
GROUP III
Skin Spot (Polyscytalum pustulans (Owen & Wakefield) M. B. Ellis)
0.5%
3.0.%
4.0.%
Black Scurf (Rhizoctonia solani Kuhn)
1.5%
3.0%
4.0.%
25.0%
Common Scab (Streptomyces species)
3.0%
3.0.%
4.0.%
25.0%
Powdery Scab (Spongospora subterranea (Wallr) Lagerh.)
1.5%
3.0%
4.0.%
12.5%
GROUP IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety
2.0%
4.0.%
GROUP V
Dirt or other extraneous matter
1.0%
1.0%
–
TABLE IV
BASIC SEED POTATOES OTHER THAN VTSC CLASS AND EQUIVALENT IN OTHER PARTS OF THE UK
Column 1
Column 2
Column 3
Column 4
Column 5
Diseases, pests, damage and defects
Individual tolerances
Group Tolerances
Collective group tolerances
Allowable % surface area cover
GROUP I
Wart Disease (Synchytrium endobioticum (Schilb) Perc.)
NIL
–
–
Potato Tuber Eelworm (Ditylenchus destructor Thorne)
NIL
–
–
Potato Cyst Nematode (Globodera species infesting potatoes)
NIL
–
–
Ring Rot (Clavibacter michiganensis (Smith) Davis et al ssp sepedonicus (Spieck. & Kotth.) Davis et al)
NIL
–
–
Brown Rot (Ralstonia solancearum (Smith) Yabuuchi et al.)
NIL
–
–
Potato Tuber Moth (Phthorimaea operculella (Zell)
NIL
–
–
Potato Spindle Tuber Viroid
NIL
–
–
Colorado Beetle (Leptinotarsa decemlineata (Say))
NIL
–
–
GROUP II
Blight (Phytophthora infestans (Mont.) de Bary
0.5%
0.5%
4.0%
Blackleg (Erwinia carotovora (Jones) Bergey et al. ssp atroseptica (Hellmers & Dowson) Dye) or Erwinia chrysanthemi Burkholder et al or both
0.5%
0.5%
4.0%
Wet Rot including: Watery Wound Rot (Pythium ultimum Trow)
0.5%
0.5%
4.0%
Pink Rot (Phytophthora erythroseptica Pethybridge) and Pit Rot
0.5%
0.5%
4.0%
Dry Rot (Fusarium species)
0.5%
0.5%
4.0%
Gangrene (Phoma species)
0.5%
0.5%
4.0%
Frost damaged tubers
0.5%
0.5%
4.0%
GROUP III
Skin Spot (Polyscytalum pustulans (Owen & Wakefield) M. B. Ellis)
2.0%
4.0%
4.0%
12.5%
Powdery Scab (Spongospora subterranea (Wallr) Lagerh.)
3.0%
4.0%
4.0%
12.5%
Black Scurf (Rhizoctonia solani Kuhn)
3.0%
4.0%
4.0%
25.0%
Common Scab (Streptomyces species)
4.0%
4.0%
4.0%
25.0%
GROUP IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety
2.0%
4.0%
4.0%
GROUP V
Dirt or other extraneous matter
1.0%
–
TABLE V
BASIC SEED POTATOES PRODUCED OUTSIDE SCOTLAND AND NOT PRODUCED IN THE UK
Column 1
Column 2
Column 3
Column 4
Column 5
Diseases, pests, damage and defects
Individual tolerances
Group Tolerances
Collective group tolerances
Allowable % surface area cover
GROUP I
Wart Disease (Synchytrium endobioticum (Schilb) Perc.)
NIL
–
Potato Tuber Eelworm (Ditylenchus destructor Thorne)
NIL
–
Potato Cyst Nematode (Globodera species infesting potatoes)
NIL
–
Ring Rot (Clavibacter michiganensis (Smith) Davis et al ssp sepedonicus (Spieck. & Kotth.) Davis et al)
NIL
–
Brown Rot (Ralstonia solancearum (Smith) Yabuuchi et al.)
NIL
–
Potato Tuber Moth (Phthorimaea operculella Zell)
NIL
–
Potato Spindle Tuber Viroid
NIL
–
Colorado Beetle (Leptinotarsa decemlineata (Say))
NIL
–
GROUP II
Dry and Wet Rot
0.5%
6.0%
GROUP III
Common Scab (Streptomyces species)
5.0.%
6.0%
33.3%
GROUP IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety
3.0%
6.0%
GROUP V
Dirt or other extraneous matter
2.0%
–

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Source: https://www.legislation.gov.uk/ssi/2000/201/schedule/7/paragraph/5 (the official version)
Page: https://openlegislation.uk/seed-potatoes-scotland-regulations-2000/schedule-7/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.