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The Seed Potatoes (England) Regulations 2015

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Regulation 2(3)

SCHEDULE 3U.K.Specified diseases or pests, damage and defects and tolerances

This schedule has no associated Explanatory Memorandum

PART 1U.K.Pre-basic seed potatoes of [F1GB] grade PBTC produced in England

Column 1Column 2
Specified diseases or pests, damage and defectsIndividual tolerances
Group 1
Wart Disease (Synchytrium endobioticum (Schlib) 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 spp sepedonicus (Spieck & Kotth) Davis et al)Nil
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchi et al)Nil
Potato Spindle Tuber ViroidNil
Colorado Beetle (Lepinotarsa decemlineata (Say))Nil
[F2Candidatus Liberibacter solanacearum Liefting et al Nil
Candidatus Phytoplasma solani Quaglino et alNil]
Group II
Blight (Phytophthora infestans) (Mont) de Bary)Nil
[F3Blackleg (Dickeya Samson et al. spp. or Pectobacterium Waldee emend. Hauben et al. spp. or both]Nil
Soft Rots including: Watery Wound Rot (Pythium ultimum Trow)Nil
Pink Rot (Phytophthora erythroseptica Pethybridge) and Pit RotNil
Dry Rot (Fusarium species)Nil
Gangrene (Phoma species)Nil
Frost damaged tubersNil
Group III
Skin spot (Polyscytalum pustulans (Owen & Wakefield) M B EllisNil
Group IV
[F4Black scurf as caused by Thanatephorus cucumeris (A.B. Frank) Donk]Nil
Common Scab (Streptomyces species)Nil
Group V
Powdery scab (Spongospora subterranea (Wallr) Legerh)Nil
Group VI
External blemishes, including damaged tubers or tubers other than diseased tubers whose shape is atypical for the varietyNil
Superficial necrosis caused by potato virus YNil
Shrivelled tubers due to excessive dehydration or dehydration caused by silver scurf (Helminthosporium solani)Nil
Group VII
Dirt or other extraneous matter1.0%

[F5PART 2U.K.Pre-basic seed potatoes of [F6GB] grade PB produced in England

Column 1Column 2Column 3Column 4
Specified diseases or pests, damage and defectsIndividual tolerancesGroup tolerancesCollective group tolerances
Group 1
Wart Disease (Synchytrium endobioticum (Schlib) 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 spp sepedonicus (Spieck & Kotth) Davis et al)Nil--
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchi et al)Nil--
Potato Spindle Tuber ViroidNil--
Colorado Beetle (Lepinotarsa decemlineata (Say))Nil--
[F7Candidatus Liberibacter solanacearum Liefting et al Nil--
Candidatus Phytoplasma solani Quaglino et alNil--]
Group II
Blight (Phytophthora infestans (Mont) de Bary)0.2%))
[F8Blackleg (Dickeya Samson et al. spp. or Pectobacterium Waldee emend. Hauben et al. spp. or both]0.2%))
Soft Rots including: Watery Wound Rot (Pythium ultimum Trow)0.2%))
Pink Rot (Phytophthora erythroseptica Pethybridge) and Pit Rot0.2%) 0.2%)
Dry Rot (Fusarium species)0.2%))
Gangrene (Phoma species)0.2%))
Frost damaged tubers0.2%))
Group III
Skin spot (Polyscytalum pustulans (Owen & Wake-field)) M B Ellis0.2%)) 6.0%
Group IV

[F9Black scurf as caused by Thanatephorus cucumeris (A.B. Frank) Donk]

Provided that seed potatoes which have at least two eyes at the rose end that are wholly unaffected and less than one-tenth of whose surface area has been affected are deemed to be unaffected by the disease

1.0%) 5.0%)

Common Scab (Streptomyces species)

Provided that seed potatoes which have at least two eyes at the rose end that are wholly unaffected and less than one-third of whose surface area has been affected are deemed to be unaffected by the disease

5.0%))
Group V

Powdery scab (Spongospora subterranea (Wallr) Legerh)

Provided that seed potatoes which have at least two eyes at the rose end that are wholly unaffected and less than one-tenth of whose surface area has been affected are deemed to be unaffected by the disease

1.0%))
Group VI
External blemishes including damaged tubers or tubers other than diseased tubers whose shape is atypical for the variety3.0%))
Superficial necrosis caused by potato virus YNil) 3.0%)
Shrivelled tubers due to excessive dehydration or dehydration caused by silver scurf (Helminthosporium solani)0.5%))
Group VII
Dirt or other extraneous matter1.0%--]

[F5PART 3U.K.Basic seed potatoes and certified seed potatoes produced in England

Column 1Column 2Column 3Column 4
Specified diseases or pests, damage and defectsIndividual tolerancesGroup tolerancesCollective group tolerances
Group I
Wart Disease (Synchytrium endobioticum (Schlib) 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 spp sepedonicus (Spieck & Kotth) Davis et al)Nil--
Brown Rot (Ralstonia solanacearum (Smith) Yabuuchi et al)Nil--
Potato Spindle Tuber ViroidNil--
Colorado Beetle (Lepinotarsa decemlineata (Say))Nil--
[F10Candidatus Liberibacter solanacearum Liefting et alNil--
Candidatus Phytoplasma solani Quaglino et alNil--]
Group II
Blight (Phytophthora infestans (Mont) de Bary)0.5%))
[F11Blackleg (Dickeya Samson et al. spp. or Pectobacterium Waldee emend. Hauben et al. spp. or both]0.5%))
Soft Rots including Watery Wound Rot (Pythium ultimum Trow)0.5%))
Pink Rot (Phytophthora erythroseptica Pethy-bridge) and Pit Rot0.5%) 0.5%)
Dry Rot (Fusarium species)0.5%))
Gangrene (Phoma species)0.5%))
Frost damaged tubers0.5%))
Any of these Group II defects that present as a wet rot symptom0.2%)) 6.0% for basic seed potatoes and 8.0% for certified seed potatoes
Group III
Skin spot (Polyscytalum pustulans (Owen & Wakefield) M B Ellis)

0.5% except [F12GB] grade E, [F12GB] grade A and [F12GB] grade B grades;

2.0% for [F12GB] grade E, [F12GB] grade A and [F12GB] grade B grades only

))

Powdery scab (Spongospora subterranea (Wallr) Legerh)

Provided that seed potatoes which have at least two eyes at the rose end that are wholly unaffected and less than one-tenth of whose surface area has been affected are deemed to be unaffected by the disease (except where powdery scab takes its cankerous form)

3.0%) 5.0%)
Group IV

[F13Black scurf as caused by Thanatephorus cucumeris (A.B. Frank) Donk]

Provided that seed potatoes which have at least two eyes at the rose end that are wholly unaffected and less than one-tenth of whose surface area has been affected are deemed to be unaffected by the disease

5.0%))

Common Scab (Streptomyces species)

Provided that seed potatoes which have at least two eyes at the rose end that are wholly unaffected and less than one-third of whose surface area has been affected are deemed to be unaffected by the disease

5.0%))
Group V
External blemishes including damaged tubers or tubers other than diseased tubers whose shape is atypical for the variety3.0%))
Shrivelled tubers due to excessive dehydration or dehydration caused by silver scurf (Helminthosporium solani)1.0%) 3.0%)
Superficial necrosis caused by strains of potato virus Y0.1%))
Group VI
Dirt or other extraneous matter1.0%--]

PART 4U.K.Test and trial seed potatoes

Column 1Column 2Column 3
Specified diseases or pests, damage and defectsIndividual tolerancesCollective 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 ViroidNil
Colorado Beetle (Lepinotarsa decemlineata (Say))Nil
[F14Candidatus Liberibacter solanacearum Liefting et al Nil-
Candidatus Phytoplasma solani Quaglino et alNil-]
Wart Disease (Synchytrium endobioticum (Schlib) 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 matter2.0%
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 variety3.0%) 6.0%
Common scab: tubers affected over more than one-third of their surface5.0%)

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