General quality standards
For quick emergence and a good growth vigour, seed should have been stored for at least 2.5 - 3 months and no longer than 5 - 9 months (depending on the storage temperature).
Seed to be used for multiplication, i.e. to produce seed again should not contain more than 2% virus. This means that during field inspection a tolerance level of 1% virus can be used.
This means that for the seed supplied to the higher altitudes to farmers organizations that produce own seed or seed for the market the tolerance for virus diseases is: not more than 2% virus.For seed to be used for the production of table potatoes higher tolerance levels can be applied. A virus percentage of 10% may give a yield reduction of not more than 2 - 3%.
3.Earth and extraneous matter
Not more than 2% by weight.
4.Dry and wet rot
Dry and wet rot (including Phytophthora infestans) no more than 1% by weight, except if caused by Synchytrium endobioticum, Corynebacterium sepedonicum, Pseudomonas solanacearum.
Not more than 2% of the tubers attacked.
Over 25% of tuber surface affected: 5%.
Over 10% of tuber surface affected: 5%