Vinifera x Berlandieri Group

41B

Origin: France (Chasselas x Berlandieri – Millardet e De Grasset 1882).

VEGETATIVE FEATURES

Leaf: medium-small, three-lobed, orbicular, with an open-lyre petiolar sinus; the upper side is smooth, hairless, the lower side is woolly, with a dark green flap, slightly bent; the ribs are green.

Woody shoot: short, not uniform, not very branched, with moderately developed secondary shoots, polygonal, hairless, partially pruinose, gray-brown, with evident nodes.

CULTURAL APTITUDES

Ability to promote fruit setting:

good

Root system regeneration:

slow

Adaptability to soil type:

compact: good
wet: poor
dry: good
stony: everage
acidic: poor
saline: poor
shallow: good

Branching pattern of the roots:

taproot

Tendency to the emission of suckers:

poor

Susceptibility to deficiencies or excesses:

deficiency of K: sensitive
deficiency of Fe: low sensitivity
deficiency of Mg: very sensitive
deficiency of Zn: sensitive
excess of Cu: very sensitive

Resistance to root phylloxera:

good

Resistance to leaf phylloxera:

excellent

Susceptibility to fungal and plant diseases:

downy mildew: very sensitive
powdery mildew: low
anthracnose: very sensitive
botrytis: less sensitive
eutypa disease: some sensitivity
rachis desiccation:low sensitivity
esca disease: some sensitivity

OTHER INFORMATION

Behavior in the nursery:the rooting is scarce in combination with most grape varieties; it triggers a quite good scion development; induces a considerable swelling of the grafting point; both hormonal treatments and mulching are effective so as to stimulate rooting.

Behavior in the propagation block: it is advisable to implement breeding on trellis systems to facilitate growth and the control of cryptogams.

Behavior in the open field: it induces an earlier harvest; it ensures good grape quality; it is not suitable to replanting; it is suitable to dense planting systems; it also induces diametrical growth differences at the grafting point, it needs warm soils.