SCHEDULE 6 Tolerances for diseases, pests, damage and defects in seed potato tubers
regulations 2(1), 16(1)(e) and 20(3)

1 Tolerances
(1) For the purposes of these Regulations—
(a) Table 1 applies—
(i) to seed potatoes classified under these Regulations as being of the class Pre-basic TC; and
(ii) to pre-basic seed potatoes produced outside Northern Ireland which are approved by the Department as being equivalent to that class;
(b) Table 2 applies—
(i) to seed potatoes classified under these Regulations as being of the class Pre-basic 1, Pre-basic 2, Pre-basic 3 or Pre-basic 4; and
(ii) to pre-basic seed potatoes produced outside Northern Ireland which are approved by the Department as being equivalent to these classes;
(c) Table 3 applies to basic seed potatoes, conservation varieties and equivalent, and test and trial seed potatoes, produced in Northern Ireland or any other part of the United Kingdom which are approved by the Department as being equivalent to either of these classes; and
(d) Table 4 applies in the case of basic seed potatoes produced outside the United Kingdom.
(2) Subject to paragraph (3), any tolerance in a Column of any of the Tables in this Schedule expressed as a percentage is a reference to the proportion which the weight of potatoes affected by the disease, pest, damage or defect bears to the total weight of the sample taken in accordance with regulation 21(3) and Schedule 8, expressed as a percentage.
(3) In the case of dirt or other extraneous matter, any tolerance in a Column of any the Tables in this Schedule expressed as a percentage is a reference to the proportion which the weight of such matter bears to the total weight of the sample taken in accordance with regulation 21(3) and Schedule 8, expressed as a percentage.

2 Individual tolerances
The individual tolerances set out in the entry in Column 2 of Table 1, 2, 3 or, as the case may be, 4 corresponding to the disease, pest, damage or defect set out in Column 1 of these Tables is specified in the case of seed potatoes to which the Table applies in relation to the disease, pest, damage or defect to which the entry corresponds.

3 Group tolerances
The group tolerances set out in the entry in Column 3 of Table 2, 3, or, as the case may be, 4 corresponding to the diseases, pests, damage, or defects within Group 2 or 3 set out in Column 1 of those Tables is specified in the case of seed potatoes to which the Table applies in relation to the Group to which the entry corresponds.

4 Collective group tolerances
The collective group tolerances set out in the entry in Column 4 of Table 1, 2, 3, or, as the case may be, 4 corresponding to the diseases, pests, damage or defects within Group 2, 3 and 4 set out in Column 1 of those Tables is specified in the case of seed potatoes to which the Table applies in relation to those Groups.

5 Allowable surface area cover
(1) This paragraph applies, for the purposes of these Regulations, to seed potatoes to which Table 2, 3, or 4 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 3, 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 (Spongosporasubterranea (Wallr.) Lagerh) takes its cankerous form.

Table 1
PRE-BASIC TISSUE CULTURE CLASS
Column 1 Diseases, pests damage and defects	Column 2 Individual Tolerances
Group 1	
Wart Disease (Synchytriumendobioticum (Schilb.))	NIL
Potato Tuber Eelworm (Ditylenchus destructor Thorne)	NIL
Potato Cyst Nematode (Globodera species infesting potatoes)	NIL
Ring Rot (Clavibactermichiganensis (Smith) Davis et al. ssp sepedonicus (Spieck & Kotth.) Davis et al.)	NIL
Brown Rot (Ralstoniasolanacearum (Smith) Yabuuchi et al.)	NIL
Potato Tuber Moth (Phthorimaeaoperculella (Zeller))	NIL
Potato Spindle Tuber Viroid	NIL
Colorado Beetle (Leptinotarsadecemblineata (Say))	NIL
Group 2	
Blight (Phytopthorainfestatans (Mont. (de Bary)	NIL
Blackleg (Pectobacterium spp)	NIL
Gangrene (Phoma species)/Dry Rot (Fusarium species)/Wet Rot	NIL
Frost damaged tubers	NIL
Group 3	
Skin Spot (Polyscytalumpustulans (Owen & Wakefield) M.B. Ellis)	NIL
Black Scurf (Rhizoctoniasolani Kuhn)	NIL
Common Scab (Streptomyces species)	NIL
Powdery Scab (Spongosporasubterranea (Wallr) Lagerh)	NIL
Group 4	
External blemishes	3%
Group 5	
Dirt or other extraneous matter	1%

Table 2
PRE-BASIC 1 TO PRE-BASIC 4 CLASS AND EQUIVALENT (NORTHERN IRELAND AND OTHER PARTS OF THE UK)
Column 1 Diseases, pests, damage and defects	Column 2 Individual Tolerances	Column 3 Group Tolerances	Column 4 Collective Group Tolerances	Column 5 Allowable % surface area cover
Group 1				
Wart Disease (Synchytriumendobioticum (Schilb.))	NIL	NIL	NIL	NIL
Potato Tuber Eelworm (Ditylenchus destructor Thorne)	NIL	NIL	NIL	NIL
Potato Cyst Nematode (Globodera species infesting potatoes)	NIL	NIL	NIL	NIL
Ring Rot (Clavibactermichiganensis (Smith) Davis et al. ssp. sepidonicus (Spieck & Kotth.) Davis et al.)	NIL	NIL	NIL	NIL
Brown Rot (Ralstoniasolanacearum (Smith) Yabuuchi et al.)	NIL	NIL	NIL	NIL
Potato Tuber Moth (Phthorimaeaoperculella Zeller))	NIL	NIL	NIL	NIL
Potato Spindle Tuber Viroid	NIL	NIL	NIL	NIL
Colorado Beetle (Leptinotarsadecemlineata (Say))	NIL	NIL	NIL	NIL
Group 2				
Blight (Phytophthorainfestans (Mont.) de Bary)	0.2%	0.2%	4.0%	NIL
Blackleg (Pectobacterium spp.)	0.05%	0.02%	NIL	NIL
Gangrene (Phoma species)/Dry Rot (Fusarium species)/ Wet Rot	0.2%	0.2%	4.0%	NIL
Frost damaged tubers	0.2%	0.2%	4.0%	NIL
Group 3				
Skin Spot (Polyscytalumpustalans (Owen & Wakefield) M.B. Ellis)	0.2%	3.0%	4.0%	NIL
Black Scurf (Rhizoctoniasolani Kuhn)	1.0%	3.0%	4.0%	12.5%
Powdery Scab (Spongosporasubterranea (Wallr) Lagerh)	1.0%	3.0%	4.0%	12.5%
Common scab (Streptomyces species)	3.0%	3.0%	4.0%	25.0%
Group 4				
Blemishes such as damaged or misshapen tubers	1.0%	NIL	4.0%	NIL
Group 5				
Dirt or other extraneous matter	1.0%	NIL	NIL	NIL
Note: The collective group tolerance in Column 4 applies to Groups 2, 3, and 4 in Column 1.

Table 3
BASIC SEED POTATO CLASSES AND EQUIVALENT, INCLUDING TEST AND TRIAL SEED POTATOES AND CONSERVATION VARIETY SEED POTATOES (NORTHERN IRELAND AND OTHER PARTS OF THE UK)
Column 1 Diseases, pests, damage and defects	Column 2 Individual Tolerances	Column 3 Group Tolerances	Column 4 Collective Group Tolerances	Column 5 Allowable % surface area cover
Group 1				
Wart Disease (Synchytriumendobioticum (Schilb.))	NIL	NIL	NIL	NIL
Potato Tuber Eelworm (Ditylenchus destructor Thorne)	NIL	NIL	NIL	NIL
Potato Cyst Nematode (Globodera species infesting potatoes)	NIL	NIL	NIL	NIL
Ring Rot (Clavibactermichiganensis (Smith) Davis et al. ssp.sepedonicus (Spieck & Kotth.) Davis et al.)	NIL	NIL	NIL	NIL
Brown Rot (Ralstoniasolanacearum (Smith) Yabuuchi et al.)	NIL	NIL	NIL	NIL
Potato Tuber Moth (phthorimaeaoperculella (Zeller))	NIL	NIL	NIL	NIL
Potato Spindle Tuber Viroid	NIL	NIL	NIL	NIL
Colorado Beetle (Leptinotarsadecemlineata (Say))	NIL	NIL	NIL	NIL
Column 1 Diseases, pests, damage and defects	Column 2 Individual Tolerances	Column 3 Group Tolerances	Column 4 Collective Group Tolerances	Column 5 Allowable % surface area cover
Group 2				
Blight (Phytophthorainfestans (Mont.) de Bary)	0.2%	0.5%	4.0%	NIL
Blackleg (Erwiniacarotovora (Jones)) Bergey et al. ssp. atroseptica (Hellmers & Dowson) Dye) or Dickeyadadantii (Erwiniachrysanthemi)	0.2%	0.5%	5.0%	NIL
Soft/Wet Rot	0.2%	0.5%	5.0%	NIL
Dry Rot (Fusarium species)	0.4%	0.5%	5.0%	NIL
Gangrene (Phoma species)	0.4%	0.5%	5.0%	NIL
Frost damaged tubers	0.2%	0.5%	5.0%	NIL
Group 3				
Skin Spot (Polyscytalumpustulans (Owen & Wakefield) M.B. Ellis)	2.0%	5.0%	5.0%	12.5%
Black Scurf (Rhizoctaniasolani Kuhn)	3.0%	4.0%	4.0%	25.0%
Common Scab (Streptomyces species)	5.0%	5.0%	5.0%	33.3%
Powdery Scab (Spongosporasubterranea (Wallr) Lagerh)	3.0%	5.0%	5.0%	12.5%
Group 4				
Blemishes such as damaged or misshapen tubers	2.0%	NIL	5.0%	NIL
Group 5				
Dirt or other extraneous matter	1.0%	NIL	NIL	NIL

Table 4
BASIC SEED POTATOES PRODUCED OUTSIDE THE UK
Column 1 Diseases, pests, damage and defects	Column 2 Individual Tolerances	Column 3 Group Tolerances	Column 4 Collective Group Tolerances	Column 5 Allowable % surface area cover
Group 1				
Wart Disease (Synchytriumendobioticum (Schilb.))	NIL	NIL	NIL	NIL
Potato Tuber Eelworm (Ditylenchus destructor Thorne)	NIL	NIL	NIL	NIL
Potato Cyst Nematode (Globadera species infesting potatoes)	NIL	NIL	NIL	NIL
Ring Rot (Clavibactermichiganensis (Smith) Davis etal. ssp..sepedonicus (Spieck & Kotth). Davis et al.)	NIL	NIL	NIL	NIL
Brown Rot (Ralstoniasolanacearum (Smith) Yabuuchi et al.)	NIL	NIL	NIL	NIL
Potato Tuber Moth (Phthorimaeaoperculella (Zeller))	NIL	NIL	NIL	NIL
Potato Spindle Tuber Viroid	NIL	NIL	NIL	NIL
Colorado Beetle (Leptinotarsadecemlineata (Say))	NIL	NIL	NIL	NIL
Group 2				
Dry Rot (Fusarium species) and Wet Rot	0.5%	NIL	6.0%	NIL
Group 3				
Common Scab (Streptomyces species)	5.0%	5.0%	6.0%	33.3%
Group 4				
Blemishes such as damaged or misshapen tubers	3.0%	NIL	6.0%	NIL
Group 5				
Dirt or other extraneous matter	2.0%	NIL	NIL	NIL