Technical Sheet
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M4

Origin: Italy (Università degli Studi di Milano [DiSAA]1986).

VEGETATIVE FEATURES

Leaf: large, wedge-shaped, whole, slightly three-lobed, with an open V-shaped petiolar sinus; the upper side is hairless and the flap is bullous, dark-green-colored, opaque; the lower side is bristly and green colored, with light-green ribs.
Woody shoot: long, branched, elastic, with prominent development of secondary shoots, hairless, dark purple-brown in color.

CULTURAL APTITUDES

Ability to promote fruit setting:

good

Root system regeneration:

acceptable

Adaptability to soil type:
  • compact: good
  • wet: poor
  • dry: excellent
  • stony: good
  • acidic: poor
  • saline: excellent
Branching pattern of the roots:

expanded

Tendency to emission of suckers:

moderate

Susceptibility to deficiencies or excesses:
  • deficiency of K: sensitive
  • deficiency of Mg: poor sensitivity
  • deficiency of Fe: poor sensitivity
  • deficiency of B: poor sensitivity
Resistance to root phylloxera:

good

Resistance to leaf phylloxera:

sensitive

Susceptibility to fungal and plant diseases:

downy mildew: poor
powdery mildew: poor
anthracnose: poor

OTHER INFORMATION

Behavior in the nursery: it shows a slow/moderate growth resumption; it develops a strong root system mainly consisting of thin roots. In the nursery it guarantees medium-high yields.
Behavior in the propagation block: it postpones lignification and guarantees medium-high yields.
Behavior in the open field: it develops root systems preferably between 40 and 90 cm and even over 100 cm. It tendentially restrains production and vigor, thus promoting the accumulation of sugars, anthocyanins and polyphenols. Capable of maintaining excellent levels of acidity.