The Seed Potatoes (Scotland) Regulations 2015

Allowable surface area coverS

This section has no associated Policy Notes

5.—(1) This paragraph applies, for the purposes of regulation 16(1) and (3), to seed potatoes to which Table II, III (a), (b) or (c) or IV applies.

(2) Subject to sub-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, specified in column 1 of the Table in relation to a potato of that grade when, 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 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) Sub-paragraph (2) does not apply when the disease Powdery Scab (Spongospora subterranea (Wallr.) Lagerh) takes its cankerous form.

TABLE I

[F1GB] GRADE PBTC PRODUCED IN SCOTLAND

Column 1Diseases, pests, damage and defectsColumn 2Individual Tolerances
Group I
Potato Wart Disease (Synchytrium endobioticum (Schilb) Perc.)Nil
Potato Tuber Eelworm (Ditylenchus destructor Thorne)Nil
Potato Cyst Nematode (Globodera spp. infesting potatoes)Nil
Ring Rot (Clavibacter michiganensis subsp.sepedonicus (Spieck & Kotth) Daviset al.)Nil
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchiet al.)Nil
Potato Tuber Moth (Phthorimaea operculella (Zell))Nil
Potato Spindle Tuber ViroidNil
Colorado Beetle (Leptinotarsa decemlineata (Say))Nil
[F2Candidatus Liberibacter solanacearum Liefting et al., [LIBEPS Nil]
Group II
Blackleg (Pectobacterium spp.)Nil
Dickeyaspp.Nil
Rots including Wet Rot but other than rots specified in Group INil
Frost damaged tubersNil
Group III
Skin spot (Polyscytalum pustulans (Owen & Wakefield) Ellis)Nil
Black scurf (Rhizoctonia solani Kühn)Nil
Common scab (Streptomyces spp.)Nil
Powdery scab (Spongospora subterranea) (Wallr) Lagerh.f.sp.subterranea)Nil
Group IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the varietyNil
Superficial necrosis caused by strains of Potato Virus YNil
Shrivelled tubersNil
Group V
Dirt or extraneous matter1.0%

TABLE II

[F3GB] GRADE PB PRODUCED IN SCOTLAND

Column 1Diseases, pests, damage and defectsColumn 2Individual TolerancesColumn 3Group TolerancesColumn 4Collective Group TolerancesColumn 5Allowable % surface area cover
Group I
Potato Wart Disease (Synchytrium endobioticum (Schilb) Perc.)Nil
Potato TuberNil
Eelworm (Ditylenchus destructor Thorne)
Potato Cyst Nematode (Globodera spp. infesting potatoes)Nil
Ring Rot (Clavibacter michiganensis subsp.sepedonicus (Spieck & Kotth) Daviset al.)Nil
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchiet al.)Nil
Potato Tuber Moth (Phthorimaea operculella (Zell))Nil
Potato Spindle Tuber ViroidNil
Colorado Beetle (Leptinotarsa decemlineata (Say))Nil
[F4Candidatus Liberibacter solanacearum Liefting et al., [LIBEPS Nil]
Group II
Blackleg (Pectobacterium spp.)Nil0.2%}
Dickeyaspp.Nil}
Rots, other than rots specified in Group I0.2%}
Frost damaged tubers0.2%}
Group III
Skin spot (Polyscytalum pustulans (Owen & Wakefield) Ellis)0.2%5.0%}
Black scurf (Rhizoctonia solani Kühn)1.0%}6.0%10.0%
Common scab (Streptomyces spp.)5.0%}33.3%
Powdery scab (Spongospora subterranea (Wallr) Lagerh.f.sp.subterranea)1.0%}10.0%
Group IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety3.0%3.0%}
Superficial necrosis caused by strains of Potato Virus YNil}
Shrivelled tubers0.5%}
Group V
Dirt or extraneous matter1%1%

TABLE III

[F5GB] GRADE S, SE AND E AND TEST AND TRIAL SEED POTATOES

a) [F6GB] GRADE S PRODUCED IN SCOTLAND

Column 1Diseases, pests, damage and defectsColumn 2Individual TolerancesColumn 3Group TolerancesColumn 4Collective Group TolerancesColumn 5Allowable % surface area cover
Group I
Potato Wart Disease (Synchytrium endobioticum (Schilb) Perc.)Nil
Potato Tuber Eelworm (Ditylenchus destructor Thorne)Nil
Potato Cyst Nematode (Globodera spp. infesting potatoes)Nil
Ring Rot (Clavibacter michiganensis subsp.sepedonicus (Spieck & Kotth) Daviset al.)Nil
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchiet al.)Nil
Potato Tuber Moth (Phthorimaea operculella (Zell)Nil
Potato Spindle Tuber ViroidNil
Colorado Beetle (Leptinotarsa decemlineata (Say)Nil
[F7Candidatus Liberibacter solanacearum Liefting et al., [LIBEPS Nil]
Group II
Dickeyaspp.Nil}
Rots, other than rots specified in Group I0.5%0.5%}
(of which Wet Rot)(0.2%)}
Frost damaged tubers0.5%}
Group III
Skin spot (Polyscytalum pustulans (Owen & Wakefield) Ellis)0.5%5.0%}12.5%
Black scurf (Rhizoctonia solani Kühn)5.0%}6.0%10.0%
Common scab (Streptomyces spp.)5.0%}33.3%
Powdery scab (Spongospora subterranea (Wallr) Lagerh.f.sp.subterranea)3.0%}10.0%
Group IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety3.0%3.0%}
Superficial necrosis caused by strains of Potato Virus Y0.1%}
Shrivelled tubers1.0%}
Group V
Dirt or extraneous matter1.0%1.0%
b) [F6GB] GRADE SE PRODUCED IN SCOTLAND
Column 1Diseases, pests, damage and defectsColumn 2Individual TolerancesColumn 3Group TolerancesColumn 4Collective Group TolerancesColumn 5Allowable % surface area cover
Group I
Potato Wart Disease (Synchytrium endobioticum (Schilb) Perc.)Nil
Potato Tuber Eelworm (Ditylenchus destructor Thorne)Nil
Potato Cyst Nematode (Globodera spp. infesting potatoes)Nil
Ring Rot (Clavibacter michiganensis subsp.sepedonicus (Spieck & Kotth) Daviset al.)Nil
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchiet al.)Nil
Potato Tuber Moth (Phthorimaea operculella (Zell))Nil
Potato Spindle Tuber ViroidNil
Colorado Beetle (Leptinotarsa decemlineata (Say))Nil
[F7Candidatus Liberibacter solanacearum Liefting et al., [LIBEPSNil]
Group II
Dickeyaspp.Nil}
Rots, other than rots specified in Group I0.5%}
(of which Wet Rot)(0.2%)}
Frost damaged tubers0.5%}
Group III
Skin spot (Polyscytalum pustulans (Owen & Wakefield) Ellis)0.5%5.0%}12.5%
Black scurf (Rhizoctonia solani Kühn)5.0%}6.0%10.0%
Common scab (Streptomyces spp.)5.0%}33.3%
Powdery scab (Spongospora subterranea (Wallr) Lagerh.f.sp.subterranea)3.0%}10.0%
Group IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety3.0%3.0%}
Superficial necrosis caused by strains of Potato Virus Y0.1%}
Shrivelled tubers1.0%}
Group V
Dirt or extraneous matter1.0%1.0%
c) [F6GB] GRADE E AND TEST AND TRIAL SEED POTATOES PRODUCED IN SCOTLAND
Column 1Diseases, pests, damage and defectsColumn 2Individual TolerancesColumn 3Group TolerancesColumn 4Collective Group TolerancesColumn 5Allowable % surface area cover
Group I
Potato Wart Disease (Synchytrium endobioticum (Schilb) Perc.)Nil
Potato Tuber Eelworm (Ditylenchus destructor Thorne)Nil
Potato Cyst Nematode (Globodera spp. infesting potatoes)Nil
Ring Rot (Clavibacter michiganensis subsp.sepedonicus(Spieck & Kotth) Daviset al.)Nil
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchiet al.)Nil
Potato Tuber Moth (Phthorimaea operculella(Zell))Nil
Potato Spindle Tuber ViroidNil
Colorado Beetle (Leptinotarsa decemlineata (Say))Nil
[F7Candidatus Liberibacter solanacearum Liefting et al., [LIBEPSNil]
Group II
Dickeyaspp.Nil}
Rots, other than rots specified in Group I0.5%0.5%}
(of which Wet Rot)(0.2%)}
Frost damaged tubers0.5%}
Group III
Skin spot (Polyscytalum pustulans (Owen & Wakefield) Ellis)0.5%5.0%}12.5%
Black scurf (Rhizoctonia solani Kühn)5.0%}10.0%
Common scab (Streptomyces spp.)5.0%}6.0%33.3%
Powdery scab (Spongospora subterranea (Wallr) Lagerh.f.sp.subterranea)3.0%}10.0%
Group IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety3.0%3.0%}
Superficial necrosis caused by strains of Potato Virus Y0.1%}
Shrivelled tubers1.0%}
Group V
Dirt or extraneous matter1.0%

TABLE IV

BASIC SEED POTATOES INTENDED FOR MARKETS OUTSIDE THE [F8British Islands]

Column 1Diseases, pests, damage and defectsColumn 2Individual TolerancesColumn 3Group TolerancesColumn 4Collective Group TolerancesColumn 5Allowable % surface area cover
Group I
Potato Wart Disease (Synchytrium endobioticum (Schilb) Perc.)Nil
Potato Tuber Eelworm (Ditylenchus destructor Thorne)Nil
Potato Cyst Nematode (Globodera spp. infesting potatoes)Nil
Ring Rot (Clavibacter michiganensis subsp.sepedonicus (Spieck & Kotth) Daviset al.)Nil
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchiet al.)Nil
Potato Tuber Moth (Phthorimaea operculella (Zell))Nil
Potato Spindle Tuber ViroidNil
Colorado Beetle (Leptinotarsa decemlineata (Say))Nil
Group II
Dickeyaspp.Nil}
Rots including Wet Rot but other than rots specified in Group I0.2%0.2%}
Frost damaged tubers0.2%}
Group III
Skin spot (Polyscytalum pustulans (Owen & Wakefield) Ellis)0.5%1.5%}12.5%
Black scurf (Rhizoctonia solani Kühn)1.5%}4.7%12.5%
Common scab (Streptomyces spp.)1.5%}12.5%
Powdery scab (Spongospora subterranea (Wallr) Lagerh.f.sp.subterranea)1.5%}12.5%
Group IV
External blemishes or tubers other than diseased tubers whose shape is atypical for the variety1.0%3.0%}
Superficial necrosis caused by strains of Potato Virus Y0.1%}
External necrosis (caused by viruses other than Potato Virus Y)2.0%}
Shrivelled tubers2.0%}
Group V
Dirt or extraneous matter0.5%

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