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FOOD SAFETY :
TUBER QUALITY STANDARDS
All seed potato classes are subject to the same tuber standards (i.e.
there is only one quality grade for Canada Seed Potatoes). The total allowable
disease and defects permitted in a graded seed potato lot are set out in
sections 48.1 (2) to (10) of the seed regulations. A summary of the shipping
point tolerances are listed below:
|
Disease or Defect |
Tolerance |
|
Soft rot or wet breakdown |
0.10% |
|
Dry rot and late blight |
1.00% |
|
Scab or Rhizoctonia - light |
10.00% |
|
Scab or Rhizoctonia - moderate |
5.00% |
|
Stem-end discoloration due to: top-killing, frost,
heat, or drought
with a penetration from 6 - 13
millimeters. |
4.00% |
|
Tubers malformed or externally damaged |
2.00% |
|
Total number of tubers affected by disease and
defects, not
including slight scab and rhizoctonia
and stem-end
discolouration. |
5.00% |
In addition the tolerance for foreign varieties is as follows:
| Elite 3 or Elite 4 classes of seed: |
none |
| Foundation class of seed: |
0.05% |
| Certified class of seed: |
0.10% |
In any lot of graded seed potatoes at least 98% of the tubers shall be
firm and well shaped. |
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