Kober 5BB 
General Description

Adapted to the widest range of soil types. Very fruitful in light soils, which are not rich in nutrients. Good for poor stony or shallow soils. Good tolerance of limestone; can stand up to 40% total, 20% active. Resistant to chlorosis. Very vigorous growth, it delays the vegetative cycle and is unsuitable for varieties, which are prone to coulure / sensitive in flowering (except possibly in light and dry soils). Kober 5BB easily goes to coulure, when planted in soils that produce a lot of shoots and growth. 5BB is often chosen for varieties, which naturally have low vigour.

Ampelographic description

Identification signs include:

– the tips of the young shoot are half open to closed with a moderate coat of flat-lying hairs and anthocyanin pigmentation on the borders;

-the young leaves are green with slight bronze patches;

– elongated shoot with ribbed contour, a circular or slightly elliptical section, red or striated internodes with a sparse coat of upright hairs on the nodes;

– bifid tendrils;

– adult leaves are large, soft, wedge-shaped, whole with flat leaf blades, upturned on edges of the teeth; an open U-shaped petiolar sinus, short teeth with convex sides, slight anthocyanin pigmentation of veins and the underside with a sparse coat of upright hairs;

– female flowers;

– the berries are very small, rounded and the skin color blue-black;

– vine shoots are brown-gray with darker nodes.

Resistance to soil parasites

5 BB displays high tolerance to radicicolae phylloxera and to nematodes Meloidogyne incognita and Meloidogyne hapla. On the other hand, its resistance to the nematodes Meloidogyne arenaria is only moderate and it would appear to be susceptible to Agrobacterium vitis.

Environment adaptation

This rootstock resists up to 35% of total limestone, 20% of active limestone and a CPI of 40. Its resistance to ferric chlorosis is considered as medium to good. 5 BB is likewise adapted to humid conditions and particularly to sandy soils.

Interaction with grafts and production objectives

5 BB has substantial vigor with grafts and tends to delay maturity. It is sometimes incompatible with certain grafts (for example: Cabernet franc N, Cabernet-Sauvignon N, Colombard B, Sauvignon B) particularly when these varieties are type 2 leafroll virus carriers (GLRaV-2). In the case of serious vine deformation, 5 BB clearly displays the presence of extracellular cords in the wood vessels. In terms of production, this root stock, which is sometimes used to replace missing plants, tends to foster alternating phenomena while yielding irregular results depending on the year. Products obtained sometimes have low sugar and polyphenol contents.

Resistance to aerial parasites

Susceptibility to gallicolae phylloxera is low to medium and it displays a high degree of resistance to downy mildew.

 Links:

  1. http://www.winegrowers.info/rootstocks/5BB.htm
  2. http://plantgrape.plantnet-project.org/en/porte-greffe/Kober%205%20BB

 

Fercal

Fercal was obtained from a cross made in Bordeaux in 1959. Based on genetic analyses carried out in Montpellier, this variety was derived from the crossbreeding of Berlandieri Colombard number 1 B (derived from the crossbreeding of Vitis berlandieri and Vitis vinifera cv. Ugni blanc B) and 31 Richter (derived from the crossbreeding of Vitis berlandieri cv. Rességuier number 2 and Vitis longii cv. Novo-mexicana).

Ampelographic description

Identification signs include:

– the tip of the young shoot which is half-opened with a very dense coat of flat-lying hairs and  edges;

– the young leaves have a very dense coat of flat-lying hairs;

– the shoot has a ribbed contour, a circular section or slightly elliptical with a heavy coat of upright and flat-lying hairs;

– adult leaves are wedge-shaped to kidney-shaped, whole with an involute leaf blade, an open U-shaped petiolar sinus with short teeth compared to width;

– female flowers;

– berries are small, round-shaped and the skin is bluish black;

– the vine shoots have a moderate coat of upright hairs.

Resistance to soil parasites

Fercal has a very high tolerance to radicicolae phylloxera. It likewise displays a good degree of tolerance to the nematodes Meloidogyne arenaria and Meloidogyne incognita but has just moderate resistance to the nematodes Meloidogyne hapla.

Environment Adaptation

The principle characeristic of Fercal is its very good resistance to chlorosis and its adaptation to limestone soils. It resists up to 60% of total limestone, 40% of active limestone and to a CPI of 120.

This root stock tolerates fairly well humid spring conditions and its resistance to drought is moderate to good provided that the rooting is sufficiently deep. Fercal has difficulties with absorbing magnesium in the soil, particularly wth excessive potassium fertilization. The graft varieties can display some magnesium deficiency symptoms with this root stock.

Interaction with grafts and production objectives

Fercal shows a good affinity with graft varieties.  Its speed of growth and fruit set is good. The vigor of this root stock is moderate to strong. Moderate influence on the vegetative cycle. In terms of fertility and yiled, Fercal is well-balanced, and produces good quality products. Good results can be achieved with Syrah N.

Aptitudes for plant propagation

The length and diameter of the internodes is moderate and the growth of quick buds is substantial. Wood production is moderate (30 000 to 60 000 m/ha) and vine shoots must be conserved under good conditions to avoid any dehydration. The propagation by cuttings capacity of Fercal is very good and its displays moderate capacity for grafting with substantial wood pith, which needs to be well rehydrated before usage. Hormoning is not necessary and must be moderate when used. The stratification time necessary for this root stock is relatively short.

Resistance to aerial parasites

Fercal is resistant to downy mildew and to anthracnosis with moderate sensitivity to gallicolae phylloxera.

 

Kober 5BB, Fercal