Seed classes and their qualities
The seed classes Pre-basic, basic (1 and 2), certified (1 and 2) and commercial seed used in this programme are defined as follows:
Pre-basic
Pre-basic is either grown using tubers from selected plants and multiplied under intensive selection and laboratory testing procedures, or using tubers from in-vitro plantlets produced in a protected environment (screen house) which thereafter are multiplied under strict controlled conditions. The tolerance for virus diseases and bacterial diseases are zero.
Basic-1
Basic-1 seed is grown from pre-basic seed. The tolerance for virus diseases is 0.01% and for the bacterial diseases zero.
Basic-2
Basic-2 seed is grown from basic-1 seed (or a higher class). The tolerance for virus diseases is 0.03% and for the bacterial diseases zero.
Certified-1
Certified-1 seed is grown from Basic-1 seed (or a higher class).The tolerance for virus diseases is 1-2% and for the bacterial diseases zero.
Certified-2
Certified-2 seed is grown from Basic-2 seed (or a higher class).The tolerance for virus diseases is 2% and for the bacterial diseases zero.
Commercial
Commercial seed is grown from certified seed (or a higher class). The tolerance for virus diseases is 8-10% and for the bacterial diseases zero or in special cases 0.01%.
GENERAL SEED QUALITY STANDARDS