Riparia x Rupestris Group

101-14

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

VEGETATIVE FEATURES

Leaf: medium-sized, wedge-shaped, slightly three-lobed, with an open U-shaped petiolar sinus; the upper side is opaque green, hairless, with pink-colored main ribs, the lower side is hairless, and the flap is light-green, slightly bent, thick, the main ribs are intensely purple-colored.

Woody shoot: long, well branched, elastic, hairless, purple-dark brown.

CULTURAL APTITUDES

Ability to promote fruit setting:

good

Root system regeneration:

slow

Adaptability to soil type:

compact: acceptable
wet: poor
dry: poor
stony: poor
acidic: very poor
saline: good

Branching pattern of the roots:

expanded, tendentially shallow.

Susceptibility to deficiencies or excesses:

deficiency of N: sensitive
deficiency of K: sensitive
deficiency of Fe: sensitive
deficiency of Mg: sensitive
deficiency of Zn: sensitive
deficiency of B: sensitive
deficiency of P: low sensitivity
deficiency of Cu: low sensitivity

Resistance to root phylloxera:

good

Resistance to leaf phylloxera:

poor

Susceptibility to fungal and plant diseases:

downy mildew: low
powdery mildew: low
anthracnose: very sensitive
eutypa disease: low
rachis desiccation: it promotes sensitivity

OTHER INFORMATION

Behavior in the nursery: the rooting is good with most of the varieties, so much so, that it is considered an easy-to-grow rootstock.

Behavior in the propagation block: it is suitable to be cultivated sprawling on the ground, but it is advisable to grow it on trellis, so as to keep the development of secondary shoots under control; it is characterized by a short productive cycle.

Behavior in the open field: suitable for fresh and wet environments, provided that the soil is not rich in limestone; it induces an earlier harvest; it favors different growths between the bionts; it enhances the qualitative characteristics of the grapes. Incompatibility phenomena with some Sauvignon e Cabernet Sauvignon clones may occur.