SJP84-5162

Apple

Variety Description

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

Summary: 'SJP84-5162' is an apple rootstock variety with wavy basal shoots while those of the reference varieties are straight. The candidate variety has a medium to high suckering tendency, whereas for the reference varieties it is absent or very low.'SJP84-5162' has no pubescence on the upper half of the dormant one-year old shoots, whereas both 'Malling 26' and 'Malling 9' have very dense pubescence. 'SJP84-5162' has weakly shiny bark, whereas 'Malling 9' has strongly shiny bark. The growing tip for the candidate is red, while it is white for 'Malling 9'. The leaves of 'SJP84-5162' have very sparse pubescence on the lower side, whereas 'Malling 26' has dense pubescence. Self rooted trees of 'SJP84-5162' produce very small fruit, compared to those of 'Malling 26' which are medium in size. 'SJP84-5162' fruit are globose in shape with no eye basin (or a raised eye) and yellow ground colour, whereas 'Malling 26' fruit are flat in shape, have a medium to deep eye basin and a green-yellow ground colour.

Description:

TREE: medium to very high suckering tendency, poor root anchorage, dwarfing

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

ONE-YEAR OLD SHOOT: no pubescence on upper half, weak shine on bark, weak to medium flexibility, medium number to many lenticels, lenticels medium to large in size, reddish brown colour on sunny side
LATERAL BUD: small size, pointed tip, adpressed to held out relative to axis, small to medium sized bud support
GROWING TIP: red

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

FLOWER BUD: medium pink (in full balloon stage)
FLOWERS: single, pedicel green
PETALS: white with slight pink blush on a few, circular to oblong in shape, overlapping margins

FRUIT: very small, globose shape, eye is small in size, persistent calyx, medium to long sepals, sepals overlapping at base, no eye basin, eye is raised
FRUIT STALK: thin, long to very long
FRUIT SURFACE: smooth, yellow ground colour, very low amount of pink overcolour, overcolour is a blush, lenticels moderately prominent

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

Origin & Breeding History: 'SJP84-5162' originated from a cross between 'Robusta 5' and 'Malling 27', 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 'SJP84-5162' 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 'SJP84-5162' 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)

Flower: diameter (cm)

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Apple: 'SJP84-5162'

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Apple: Reference variety 'Malling 9'

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Apple: Reference variety 'Malling 26'