| Origin |
Berlandieri x Riparia, da colecção de Grasset seleccionado por Millardet. |
| Young Branch End |
Semi-open, low density of prostrate hairs. Low anthocyanin pigmentation on the edge. |
| Young leaf |
Green with golden reflexes. Low density of erect hairs on the lower page of the fourth expanded leaf. Medium anthocyanin pigmentation of the first six leaves. |
| Shoot |
Red nodes up to the end of the shoot, red internodes on the dorsal side and red striated on the ventral side. No anthocyanin pigmentation of the buds. |
| Tendrils |
Short. Discontinuous regular distribution with 02 formula. |
| Flower |
Male. |
| Adult leaf |
Cuneiform, big and whole, with trimmed lower leaves (sub-quinquelobate). Dark, shiny green with low anthocyanin pigmentation in the main ribs. Involute blade, low blistering. Short, wide and convex teeth. Wide U-shaped petiolar sinus. Upper page with erect hairs on the ribs. Low density of erect hairs on the lower page. Medium density of erect hairs on the petiole. |
|
Round, striated, yellowish brown with silver reflexes. |
| Characteristics |
420 A is known for being very vigorous and subject to an early exhaustion, due to intense fructification in the first years. This rootstock is appropriate fo the production of quality wines and table grapes.
It shows good results in the production of wood, though it has thin rods with very developed branches.
Its response to rooting is usually low.
Local grafting shows good results, though the initial development is a little slow. Hand grafting is usually low.
The rootstocks’ resistance to active limestone is of 20%.
420 A is recommended for fresh and fertile soils. It is reasonably resistant to drought and shows good resistance to moist. |
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