1- Vineyard Patterns: 41 B
It is one of the classic patterns , due to its great adaptation to limestone soils . Today it is being replaced by RU 140. It is a good rootstock for virgin soils.
2- Usual name
Alexis Millardet and Charles Grasset
4- Year of obtaining
5- Resistance to soil parasites
The tolerance degree of 41 B to root phylloxera ranges from medium to high.
In certain places it is sensitive to the nematodes Meloidogyne incognita, Meloidogyne arenaria and Meloidogyne hapla and appears sensitive to Agrobacterium vitis.
6- Adaptation to the environment
41 B is characterized by its adaptation to calcareous soils and its resistance to chlorosis.
- Resists up to 60% total limestone and up to 40% active limestone. CPI 60.
- It absorbs magnesium well from the soil.
- It has a medium vigor and its root system is composed of thick, few and fleshy roots.
- It is sensitive to excess moisture in the subsoil in spring and its resistance to drought is medium-high.
- It is poorly adapted to very compact soils.
7- Interaction with the variety and production objectives
- The vigor that 41 B transfers to the grafts is medium-strong.
- It has a very good affinity with most varieties.
- At times it has presented affinity problems with Merlot and Pinot Noir, although it continues to graft a lot with these varieties.
- The start of the plantation is quite slow. Presents latitude in the first years , but once anchored in the field it induces a great production.
- The 41 B favors the compactness of the grapes.
- It has a tendency to delay the vegetative cycle and compared to other rootstocks, the grapes obtained are rich in sugars and slightly more acidic.