SJP84-5217

Apple

Variety Description

Varieties used for comparison: 'Malling 26' and 'Malling 9'

Summary: 'SJP84-5217' is an apple rootstock variety which produces more basal shoots in the stool bed than the reference varieties. There is sparse pubescence on the upper half of the dormant one-year old shoots, whereas both 'Malling 26' and 'Malling 9' have very dense pubescence. 'SJP84-5217' has weakly shiny bark, whereas 'Malling 9' has strongly shiny bark. The leaves of 'SJP84-5217' have sparse to medium pubescence on the lower side, whereas 'Malling 26' has dense pubescence. Self rooted trees of 'SJP84-5217' produce very small fruit, compared to those of 'Malling 26' which are medium in size. 'SJP84-5217' fruit have a no eye basin or a raised eye and yellow ground colour, whereas 'Malling 26' fruit have a medium to deep eye basin and a green-yellow ground colour. In cross-section the fruit of 'SJP84-5217' have a weak core line, whereas 'Malling 26' has a moderate to strongly distinct core line.

Description:

TREE: very low suckering tendency, poor root anchorage, dwarfing

BASAL SHOOTS IN STOOL BED: weak vigour, medium number, straight

ONE-YEAR OLD SHOOT: sparse pubescence on upper half, weak shine on bark, weak to medium flexibility, many lenticels, lenticels medium in size, reddish brown colour on sunny side
LATERAL BUD: small, pointed tip, adpressed to axis, small bud support
GROWING TIP: red

SHOOT TIP LEAVES: concave to straight in cross section, very sparse pubescence on upper side, green on lower side
LEAVES: medium green, no lobing, medium size, oriented upwards to outwards, acuminate apex, serrate margin, weak glossiness on upper side, sparse pubescence on lower side, weak to medium anthocyanin on veins, no (or very weak) anthocyanin colouration on upper side
STIPULES: medium to large size

FRUIT: very small, weak ribbing, weak crowning at distal end, small to medium sized eye, eye closed, persistent calyx, short to medium sepals, sepals overlapping at base, absent to very shallow eye basin or raised eye
FRUIT STALK: thin, very long
FRUIT SURFACE: smooth, weak bloom, yellow ground colour, low to medium amount of pinkish red overcolour, overcolour is solid and washed out, very low amount of russet around stalk cavity, lenticels small and very slightly prominent
FRUIT IN CROSS SECTION: yellowish flesh, weak core line, closed locules

SEED: brown at maturity, normal shape

REACTION TO INSECTS: Resistant to woolly apple aphid (Eriosoma lanigerum Hausmann)
REACTION TO DISEASES: Resistant to scab (Venturia inaequalis (Cooke) Winter)

Origin & Breeding History: 'SJP84-5217' originated from a cross between 'Robusta 5' and 'B.57490', made in 1975 at Agriculture and Agri-Food Canada, St-Jean-sur-Richelieu, Quebec. The selection criteria and evaluation since 1975 for the variety has been on the basis of vigour, winter hardiness, disease resistance, dwarfing effect and the effect on the tree branch structure.

Tests & Trials: Tests and trials for 'SJP84-5217' were conducted at the L'Acadie Research Sub Station of Agriculture and Agri-Food Canada, St-Jean-sur-Richelieu, Quebec. The trial included 3 to 4 root stocks of each variety and 4 self rooted trees of each variety. The stoolbed was planted in 2003 and self rooted trees of the varieties were planted in an orchard in 1999 and allowed to develop into fruiting trees. Measurements and observations were recorded in 2005. Measured characteristics were based on 10 measurements.

Comparison tables for 'SJP84-5217' with reference varieties 'Malling 26' and 'Malling 9'

Dormant one-year old shoots: thickness (mm)

Dormant one-year old shoot: length of internode (mm) (at middle third of shoots)

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Apple: SJP84-5217'

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Apple: Reference variety 'Malling 9'

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Apple: Reference variety 'Malling 26'