*5.2.2 Seed treatment*

Tuber seeds are harvested and treated to remove the surrounding soil, wash and then categorize (calibration) to have homogeneous seed tubers. The categories are as follows:

Grade No. 1: Are tubers retained by a sieve with a diameter of 35 mm mesh. They correspond to the largest size of seed tubers.

Grade No. 2: Are tubers retained by a sieve with a diameter of 25 mm of mesh. They correspond to the large calibre of seed tubers.

Grade No 3: Are tubers retained by a sieve with a diameter of 15 mm of mesh. They correspond to the medium size of the seed tubers

Grade No 4: Are tubers retained by a sieve with a diameter of 10 mm of mesh. They correspond to the small calibre of seed tubers.
