SO4

Origin: Germany (Fuhr 1919).

VEGETATIVE FEATURES

Leaf: large, wedge-shaped, whole, slightly three-lobed, with an open V-U-shaped petiolar sinus; the upper side is opaque and hairless, the flap is green, wavy, with convoluted edges, thick; the lower side is bristly with whitish light-green main ribs.

Woody shoot: long, uniform, branched, with prominent development of secondary shoots, hairless, partially pruinose, dark-purple-red in color, more intensely colored at the nodes.

CULTURAL APTITUDES

Ability to promote fruit setting:

good

Root system regeneration:

good

Adaptability to soil type:

compact: average
wet: average
dry: average
stony: everage
acidic: poor
saline: poor

Branching pattern of the roots:

expanded

Tendency to the emission of suckers:

average

Susceptibility to deficiencies or excesses:

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

Resistance to root phylloxera:

good

Resistance to leaf phylloxera:

acceptable

Susceptibility to fungal and plant diseases:

downy mildew: very low
powdery mildew: sensitive
anthracnose: very sensitive
botrytis: it induces a higher sensitivity
eutypa disease: it induces sensitivity
rachis desiccation: it induces sensitivity
esca disease: sensitive

OTHER INFORMATION

Behavior in the nursery: the rooting and vegetative resumption are good in combination with most of the vine varieties, it is considered an easy-to-grow rootstock; it induces a rapid development to the scion; it shows a tendency to enlarge the callusing tissues at the grafting point; it benefits from hormone treatments and mulching so to stimulate the growth of roots.

Behavior in the propagation block: it is advisable to raise it on trellis, so to facilitate lignification; green pruning operations need to be limited.

Behavior in the open field: it anticipates fructification; it ensures a good quality of the grapes, even though it tends to delay the ripening period; it is suitable to replanting and to dense plantation; it induces differences in diametrical growth at the grafting point; it shows a moderate resistance to prolonged drought. Incompatibility events with the cultivar Cannonau have been observed.