Riparia x Rupestris Group

3309 C

Origin: France (Couderc e Georges - 1881).

VEGETATIVE FEATURES

Leaf: small-sized, wedge-shaped, whole, with a rounded outline, an open V-shaped petiolar sinus, and glossy upper side, hairless; the main ribs are red at the base; the lower side is hairless and the main ribs are red; the flap is green, slightly bent, consistent, with sharp, uneven teeth.

Woody shoot: medium-short, not uniform, branched, elliptical in shape, hairless, brown-purple colored with grayish areas.

CULTURAL APTITUDES

Ability to promote fruit setting:

good

Root system regeneration:

slow

Adaptability to soil type:

compact: poor
wet: very low
dry: poor
stony: good
acidic: poor
saline: poor
limestone: poor

Branching pattern of the roots:

expanded

Tendency to emission of suckers:

good

Susceptibility to deficiencies or excesses:

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

Resistance to root phylloxera:

good

Resistance to leaf phylloxera:

poor

Susceptibility to fungal and plant diseases:

downy mildew: sensitive
powdery mildew: sensitive
leaf spot: very sensitive
anthracnose: very sensitive
eutypa disease: low
rachis desiccation: it induces sensitivity

OTHER INFORMATION

Behavior in the nursery: the rooting is good in combination with most grape varieties; it is considered an easy-to-grow rootstock.

Behavior in the propagation block:it is advisable to grow it on trellis; it is characterized by a short productive cycle.

Behavior in the open field: it induces an early vegetative phase and enhances the qualitative characteristics of the grapes; it prefers light and fresh soils, it is suitable to loamy and shallow soils; it is subject to rapid decay; at root level it is affected by low soil temperatures. There have been cases of incompatibility with Sauvignon, Cabernet Sauvignon and lately also on Chardonnay clones.