420A Millardet and de Grasset

Relative Scion Vigour: Low to Moderate
Rootknot Nematode Resistance: Moderate
Dagger Nematode Resistance: Low
Root Lesion Nematode Resistance: Low
Phylloxera Resistance: High
Lime Tolerance: Moderate
Drought Tolerance: Moderate
Root Strike: Fair
General Comments:
420A is suited to poorer, fine textured soils. Does not withstand waterlogging. Overcropping may be a problem in the early years of vine development. Susceptible to drought. Other rootstocks better.