Within this group, Univiveros® offers two rootstocks of French origin:
– Saint Lucia 64 or better known as SL64 (clonal): Provides homogeneity to the mother block, rootstock which provides the variety which vigor of nearly 80% with respect to Mericier.
– Pontaleb, diminishes the vigor of the variety by 10 to 20% with respect to SL64.
Both are well adapted to thin soils, they are susceptible to Phytophthora and to root suffocation, and do not tolerate heavy soils with drainage problems.
They have some resistance to calcareous soils and cope quite well with the stress of hot summers.