PI-009: Seed Potato Tuber Inspection
Appendix 1: Standards for Tubers – Seeds Regulations Part II
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Disease or Defect | Tolerance by Count at Shipping Point |
Tolerance by Count at Destination |
---|---|---|
Soft rot or wet breakdown | 0.1 % | 0.5 % |
Dry rot, including late blight | 1.0 % | 1.0 % |
Scab and Rhizoctonia combinedTable Note 7
|
10.0 % |
10.0 % |
Stem-end discolouration due to top-killing, frost, heat or drought, with penetration from 6 mm to 13 mm | 4.0 % | 4.0 % |
Malformed and damage | 2.0 % | 3.0 % |
Total number of diseases and defectsTable Note 8 | 5.0 % | 5.0 % |
Table Notes
- Table Note 7
-
The total of the combined light, and combined moderate Scab and Rhizoctonia categories must not exceed 10%. No severe Scab or Rhizoctonia is allowed.
- Table Note 8
-
The total of combined tolerances for diseases and defects (not including light scab, light Rhizoctonia and stem-end discolouration), shall not exceed 5% of the total number of tubers in the lot.
Condition | Tolerance by Count |
---|---|
Tubers that are not firm | 2.0 % |
Outgrown sprouts (exceeding 20 mm) | 10.0 % |
Pressure bruises | 5.0 % |
Oversize and undersize | 5.0 % by weight |
Varietal Mixture | Tolerance by Count |
---|---|
Nuclear | 0.0% |
Pre-Elite | 0.0% |
Elite I | 0.0% |
Elite II | 0.0% |
Elite III | 0.05 % |
Elite IV | 0.1 % |
Foundation | 0.2 % |
Certified | 0.5 % |
Note: Descriptions and tolerances are for reference only; refer to Seeds Regulations Part II for complete information
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