Juneaudor précoce

Grapevine

Variety Description

Variety used for comparison: 'Adalmiina'

Summary: The plants of 'Juneaudor précoce' have an early time of bud burst while those of 'Adalmiina' have a mid-season to late bud burst. When 50% of the plants are at bud burst, the young shoot tip of 'Juneaudor précoce' is half open whereas the tip of 'Adalmiina' is slightly open. The upper side of the young leaf blade of 'Juneaudor précoce' is green whereas that of 'Adalmiina' is yellow green. The prostrate hairs between the main veins on the lower side of the young leaf blade of 'Juneaudor précoce' are of sparse to medium density whereas they are dense on 'Adalmiina'. The mature leaf blade of 'Juneaudor précoce' is large and wedge-shaped to pentagonal whereas the mature leaf blade of 'Adalmiina' is medium sized and wedge-shaped to circular. The upper lateral sinuses of the mature leaf are of medium depth on 'Juneaudor précoce' whereas they are absent or very shallow to shallow on 'Adalmiina'. The arrangement of the lobes of the petiole sinus for 'Juneaudor précoce' is wide open whereas that of 'Adalmiina' is very wide open. At the margin of the mature leaves, both sides of the teeth are straight for 'Juneaudor précoce' whereas the teeth are a mixture of both sides straight and both sides concave for 'Adalmiina'. The prostrate hairs between the main veins on the lower side of the mature leaf blade of 'Juneaudor précoce' are of sparse to medium density whereas they are dense on 'Adalmiina'. On the mature leaf, the petiole is moderately longer than the middle vein for 'Juneaudor précoce' whereas the petiole is moderately shorter than the middle vein for 'Adalmiina'. The berries of 'Juneaudor précoce' mature very early whereas those of 'Adalmiina' mature mid-season to late. Without bloom, the berries of 'Juneaudor précoce' have a yellow gold skin colour whereas those of 'Adalmiina' have a yellow green to yellow skin colour. The berries of 'Juneaudor précoce' have medium to thick skin whereas those of 'Adalmiina' have thin to medium thickness skin. The berry of 'Juneaudor précoce' has a fruity flavour whereas the berry of 'Adalmiina' has a muscat flavour.

Description:

YOUNG SHOOT TIP: half open, absent or very sparse prostrate hairs, absent or very weak anthocyanin colouration of prostrate hairs, absent or very sparse erect hairs
SHOOT: semi-erect attitude (before tying), dorsal and ventral side of internodes and nodes are green, absent or very sparse to sparse erect hairs on internodes
WOODY SHOOTS: yellowish brown, early bud burst
TENDRILS: medium to long

YOUNG LEAF BLADE: green upper side, sparse to medium density prostrate hairs between main veins on lower side, absent or very sparse to sparse erect hairs on main veins on lower side
MATURE LEAF: large blade, wedge-shaped to pentagonal, absent or very weak blistering on upper side, three lobes, medium depth upper lateral sinuses, open arrangement of lobes of upper lateral sinuses, arrangement of lobes of petiole sinus is wide open, petiole is moderately longer than middle vein
MATURE LEAF (UPPER SIDE): absent or very low proportion of main veins with anthocyanin colouration
MATURE LEAF (LOWER SIDE): sparse to medium density prostrate hairs between main veins, absent or very sparse to sparse erect hairs on main veins
TEETH OF MATURE LEAF MARGIN: short to medium length, small to medium length to width ratio, both sides are straight

FLOWER: fully developed stamens and fully developed gynoecium

BERRY BUNCH: medium size, lax density, medium length peduncle of primary bunch
BERRY: begins ripening very early, medium to large, globose shape, moderately easy to detach from pedicel, fruity flavour, complete seed formation
BERRY SKIN: yellow gold (without bloom), medium to thick
BERRY FLESH: absent or very weak anthocyanin colouration, moderately firm

Origin & Breeding History: 'Juneaudor précoce' originated from the natural hybridization of the seedling '27 Auger' that occurred in 2002 from a population of hybrid vine seedlings as part of a private breeding program by Ronald Juneau in the county of Portneuf, Quebec. From the resulting progeny, 'Juneaudor précoce' was selected in 2016 based on its plant vigour, flower size, ability to flower under short-day conditions, the reliability of propagation by cuttings, as well as for its winemaking characteristics.

Tests & Trials: The comparative trial for 'Juneaudor précoce' was conducted during the growing season of 2022 in the county of Portneuf, Quebec. The trial was planted in 2016 and consisted of a single row of 'Juneaudor précoce' vines and multiple rows of 'Adalmiina' vines. The vines of 'Juneaudor précoce' were spaced 1 metre apart between the individual plants while the vines of 'Adalmiina' were spaced 1.4 metres apart between individual plants. These vines have produced berries since 2019. Observations and measurements were taken from 10 plants, or 10 parts of plants, of 'Juneaudor précoce' and 5 plants, or 10 parts of plants, of 'Adalmiina'.

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Grapevine: 'Juneaudor précoce' (left) with reference variety 'Adalmiina' (right)

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Grapevine: 'Juneaudor précoce' (left) with reference variety 'Adalmiina' (right)