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Seed Potatoes Regulations (Northern Ireland) 2001

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Allowable surface area cover

5.—(1) This paragraph applies, for the purposes of these Regulations, 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 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) Paragraph (2) shall not apply when the disease Powdery Scab (Spongospora subterranea (Wallr.) Lagerh) takes its cankerous form.

Table I

Pre-basic Tissue Culture Class

Column 1Column 2
Diseases, pests, damage and defectsIndividual Tolerances
Group I
Wart Disease (Synchytrium endobioticum (Schilb.))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 solanacearum (Smith) Yabuuchi et al.)NIL
Potato Tuber Moth (Phthorimaea operculella (Zell))NIL
Potato Spindle Tuber ViroidNIL
Colorado Beetle (Leptinotarsa decemlineata (Say))NIL
Group II
Blight (Phytophthora infestans (Mont.) de Bary)NIL
Blackleg (Erwinia carotovora (Jones) Bergey et al. ssp. atroseptica (Hellmers & Dowson) Dye) or Erwinia chrysanthemi Burkholder et al. or bothNIL
Gangrene (Phoma species)/Dry Rot (Fusarium species)/Wet RotNIL
Frost damaged tubersNIL
Group III
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 blemishes3%
Group V
Dirt or other extraneous matter1%

Table II

Pre-basic 1 and Pre-basic 2 Class

Column 1Column 2Column 3Column 4Column 5
Diseases, pests, damage and defectsIndividual TolerancesGroup TolerancesCollective Group TolerancesAllowable % surface area cover
Group I
Wart Disease (Synchytrium endobioticum (Schilb.))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 solanacearum (Smith) Yabuuchi et al.)NIL
Potato Tuber Moth (Phthorimaea operculella (Zell))NIL
Potato Spindle Tuber ViroidNIL
Colorado Beetle (Leptinotarsa decemlineata (Say))NIL
Group II
Blight (Phytophthora infestans (Mont.) de Bary)0.1%0.2%4.0%
Blackleg (Erwinia carotovora (Jones) Bergey et al. ssp. atroseptica (Hellmers &0.05%0.2%4.0%
Dowson) Dye) or Erwinia chrysanthemi Burkholder et al. or both0.2%0.2%4.0%
Gangrene (Phoma species)/ Dry Rot (Fusarium species)/ Wet Rot0.1%0.2%4.0%
Frost damaged tubers0.1%0.2%4.0%
Group III
Skin Spot (Polyscytalum pustulans (Owen & Wakefield) M. B. Ellis)0.2%3.0%4.0%12.5%
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 IV4.0%
Blemishes such as damaged or misshapen tubers1.0%
Group V
Dirt or other extraneous matter1.0%

Note: The collective group tolerance in Column 4 applies to Groups II, III and IV in Column 1.

Table III

VTSC Class and Eqivalent (Northern Ireland and other parts of the UK)

Column 1Column 2Column 3Column 4Column 5
Diseases, pests, damage and defectsIndividual TolerancesGroup TolerancesCollective Group TolerancesAllowable % surface area cover
Group I
Wart Disease (Synchytrium endobioticum (Schilb.))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 solanacearum (Smith) Yabuuchi et al.)NIL
Potato Tuber Moth (Phthorimaea operculella (Zell))NIL
Potato Spindle Tuber ViroidNIL
Colorado Beetle (Leptinotarsa decemlineata (Say))NIL
Group II
Blight (Phytophthora infestans (Mont.) de Bary)0.2%0.5%4.0%
Blackleg (Erwinia carotovora (Jones) Bergey et al. ssp. atroseptica (Hellmers & Dowson) Dye) or Erwinia chrysanthemi Burkholder et al. or both 0.05%0.5%4.0%
Soft/Wet Rot0.2%0.5%4.0%
Dry Rot (Fusarium species)0.4%0.5%4.0%
Gangrene (Phoma species)0.4%0.5%4.0%
Frost damaged tubers0.2%0.5%4.0%
Group III
Skin Spot (Polyscytalum pustulans (Owen & Wakefield) M. B. Ellis)0.5%3.0%4.0%12.5%
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
Blemishes such as damaged or misshapen tubers2.0%4.0%
Group V
Dirt or other extraneous matter1.0%

Note: The collective group tolerance in Column 4 applies to Groups II, III and IV in Column 1

Table IV

Basic Seed Potatoes other than VTSC class and equivalent (Northern Ireland and other parts of the UK)

Column 1Column 2Column 3Column 4Column 5
Diseases, pests, damage and defectsIndividual TolerancesGroup TolerancesCollective Group TolerancesAllowable % surface area cover
Group I
Wart Disease (Synchytrium endobioticum (Schilb.))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 solanacearum (Smith) Yabuuchi et al.)NIL
Potato Tuber Moth (Phthorimaea operculella (Zell))NIL
Potato Spindle Tuber ViroidNIL
Colorado Beetle (Leptinotarsa decemlineata (Say))NIL
Group II
Blight (Phytophthora infestans (Mont.) de Bary)0.2%0.5%4.0%
Blackleg (Erwinia carotovora (Jones)) Bergey et al. ssp. atroseptica (Hellmers &Dowson) Dye) or Erwinia chrysanthemi Burkholder et al. or both0.2%0.5%4.0%
Soft/Wet Rot0.2%0.5%4.0%
Dry Rot (Fusarium species)0.4%0.5%4.0%
Gangrene (Phoma species)0.4%0.5%4.0%
Frost damaged tubers0.2%0.5%4.0%
Group III
Skin Spot (Polyscytalum pustulans (Owen & Wakefield) (M. B. Ellis)2.0%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%
Powdery Scab (Spongospora subterranea (Wallr) Lagerh)3.0%4.0%4.0%12.5%
Group IV
Blemishes such as damaged or misshapen tubers2.0%4.0%
Group V
Dirt or other extraneous matter1.0%

Note: The collective group tolerance in Column 4 applies to Groups II, III and IV in Column 1.

Table V

Basic Seed Potatoes produced outside the UK

Column 1Column 2Column 3Column 4Column 5
Diseases, pests, damage and defectsIndividual TolerancesGroup TolerancesCollective Group TolerancesAllowable % surface area cover
Group I
Wart Disease (Synchytrium endobioticum (Schilb.))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 solanacearum (Smith) Yabuuchi et al.)NIL
Potato Tuber Moth (Phthorimaea operculella (Zell))NIL
Potato Spindle Tuber ViroidNIL
Colorado Beetle (Leptinotarsa decemlineata (Say))NIL
Group II
Dry Rot (Fusarium species) and Wet Rot0.5%6.0%
Group III
Common Scab (Streptomyces species)5.0%6.0%33.3%
Group IV
Blemishes such as damaged or misshapen tubers3.0%6.0%
Group V
Dirt or other extraneous matter2.0%

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