(Nicola) Apple Skin
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HORTSCIENCE 40(7):2204–2206. 2005. pattern of over color is blush, with faint short narrow streaks. Flesh color is cream to light yellow, 11D. ‘SPA440’ (Nicola) Apple Skin. The skin is medium in thickness, C.R. Hampson,1 R.A. MacDonald, D.-L. McKenzie, H.A. Quamme,2 smooth and glossy. The incidence of russet is very low (2%) on cheeks and lenticels, but and W.D. Lane characteristically present in stem bowl. Russet Agriculture and Agri-Food Canada, Pacifi c Agri-Food Research Centre, P.O. is more severe in cool humid growing condi- Box 5000, Summerland, B.C. Canada V0H 1Z0 tions. Lenticels are conspicuous, numerous, medium in size, white or pale tan. Additional index words. cultivar description, fruit breeding, Malus ×domestica Pedicel. The fruit stem is long, thin, and deeply inserted in the stem bowl. Its length is ‘SPA440’ (Nicola) is an attractive, large- chart (1966). Measurements are the average of 39 mm, with thickness 2 mm. Stems frequently fruited late-harvest apple with sweet, crisp, 10 plant parts unless otherwise specifi ed. break instead of detaching at the spur when juicy fl esh. It has a yellow ground color and the fruit is picked. red blush over color covering about 85% of the Flower Calyx. Sepals are persistent, dry, overlap- fruit skin (Fig. 1). ‘SPA440’ has better storage Flowering season. Blooms late in season, ping, recurved. The eye is closed to half open. quality and shelf life than most other bicolored after ‘Fuji’, ‘Gala’ or ‘Granny Smith’. Core. The core is in median position, small, apples in the Summerland collection. It retains Petal color. Unopened bud is RHS and has closed locules. The inner surface of good texture and juiciness for at least 5 months 61C/155D. At bloom, color on upper side is the locule is smooth or slightly tufted. Seeds in air storage at 1 °C, and has excellent shelf 61C/155D, on lower side is 61B/155D. are non-tufted, acuminate, and dark brown life. ‘SPA440’ blooms very late in the apple Size. Corolla diameter at anthesis is 56 mm. at maturity. blossom season, after ‘Fuji’ or ‘Gala’. The tree Petals are cupped. King bloom petals average Texture. The fruit fl esh is juicy, fi rm and crisp, is productive and regular bearing, with 90° 18 × 28 mm, including claw (mean of 20 petals and slightly coarse. The cut fl esh will brown. branch angles and spreading growth habit. It from 10 fl owers). Firmness at harvest. Flesh fi rmness at is not subject to preharvest drop. Pollen. The pollen is fertile and has been harvest averaged 7.4 kg/f over 9 years, as Trademark protection is being sought for used successfully in crosses. measured by penetrometer using an 11.25- the name Nicola. The district around Sum- mm probe. merland, B.C., was once known as N’kwala’s Fruit Soluble solids. At harvest, soluble solids Prairie, in honor of Chief N’kwala who held Shape. The fruit is globose to globose coni- averaged 15.4% over 9 years, or 15.9% after the property. N’kwala’s name was frequently cal, weakly ribbed, and symmetrical. 6 to 8 weeks of air storage. anglicized as Nicola. Size. Fruit size is large, similar to ‘Fuji’. Sev- Acidity at harvest. Acidity of the juiced enteen harvest-time weights of 10-fruit samples fl esh at harvest averaged 0.7% as malic acid Origin over 8 harvest years averaged 269 g. over 9 years. Color. Ground color at maturity is 11B, Flavor. The fl esh tastes somewhat starchy ‘SPA440’ resulted from a 1981 cross be- covered with about 85% red (185A). The and faintly astringent at harvest; it requires 4 tween ‘Splendour’ and ‘Gala’ made by W.D. Lane and R.A. MacDonald at the Pacifi c Agri- Food Research Centre (PARC), Summerland, B.C. (Fig. 2). Seedlings were budded in place onto M.26 rootstock in the fi eld in 1984. The seedling was fi rst selected on the basis of its fruit quality and growth habit in 1988, and assigned the breeder’s number 8S-26-10. It was propagated for second test beginning in 1989, and evaluated from the time of fi rst cropping for fruit size, sensory traits, storage quality, and bearing habit over 10 years with consistent results. Yield records were only taken from trees propagated on M.9 planted in 1998. In 1996, the selection was advanced to elite-stage testing by H.A. Quamme under the name SPA 440. Controlled trials under test agreements have been established in British Columbia and at selected research sites. Description Fig. 1. Fruit of ‘SPA440’ (Nicola). The scale bar represents 5 cm. The following description of the fl owers, fruit, tree and leaves uses color designations of the Royal Horticultural Society of London color Received for publication 4 July 2005. Accepted for publication 3 Aug. 2005. We thank Warren Walters, Mark Neufi eld, Keith Johnstone, the PARC farm crew, volunteer taste panelists, and staff of the okanagan Plant Improvement Company for ongoing assistance. We also thank Karen Bedford and Tom Li for reviewing the manuscript. 1To whom correspondence should be addressed; e-mail [email protected]. 2Retired. Fig. 2. Pedigree of ‘SPA440’. 2204 HORTSCIENCE VOL. 40(7) DECEMBER 2005 11038-Cult.indd038-Cult.indd 22204204 112/4/052/4/05 88:14:39:14:39 AAMM raised, oval to round, and become more corky with age. Hardiness. Early winter (late November) hardiness of 1-year old twigs was assessed in controlled freeze tests in a single year, ac- cording to procedures previously published (Quamme, 1976). ‘SPA440’ was similar to ‘Golden Delicious’ and signifi cantly less hardy than ‘Spartan’, so was rated as moderately winter tender. Disease resistance. The disease resistance of ‘SPA440’ is comparable to its parents. It is susceptible to apple scab [caused by Venturia inaequalis (Cke.) Wint.]. Powdery mildew [caused by Podosphaera leucotricha (Ell. & Ev.) Salm.] incidence was low under con- ventional management at PARC. No natural outbreaks of fi re blight [incited by Erwinia amylovora (Burr.) Winslow] affected ‘SPA440’ during its 20 years in the fi elds at PARC. De- liberate inoculations with fi re blight bacteria in the fi eld and greenhouse have yielded con- Fig. 3. Intensity of selected attributes, each rated on a 0 (low) to 9 (high) scale, of ‘SPA440’ fruit relative to commercial cultivars. Twelve trained judges drawn from a larger pool rated the fruit in each panel. fl icting results, and further work is needed to The values are means weighted inversely to the error mean square of the analysis of variance for that characterize its resistance level. taste panel. The number of panels and years that the commercial cultivar was tested with ‘SPA440’ appears in parentheses. Leaves Size. Leaf blades average 66 × 109 mm in to 6 weeks of cold air storage to develop fl avor, Use. ‘SPA440’ is suitable for use as a des- size with a length: width ratio of 1.7. when it tastes sweet, aromatic and refreshing. sert apple, and is appropriate for medium- to Petiole. Petioles are 34 mm long on aver- The astringency dissipates in storage. long-term storage. age. Maturity season. In Summerland, the fi rst Margins and tips. The leaf apex is acuminate pick of fruit is 11 to 15 Oct., slightly before Tree to cuspidate, and the margins are serrate. ‘Fuji’ and well after ‘Delicious’ or ‘Spartan’. Vigor. The trees are moderately vigorous. Color. The adaxial side is 147A and glossy; ‘SPA440’ requires two picks, the second about Mean trunk girth on M.9 rootstock (n = 8) seven anthocyanin coloration of veins is medium 5 d after the fi rst. years after planting was 17.0 ± 1.1 cm2 (mean to strong. Keeping quality and sensory attributes. ± SE) for ‘SPA440’, similar to nearby trees of 2 Fruit of ‘SPA440’ has a long air storage life ‘Fuji’ (18.9 ± 1.8 cm ) and ‘Spartan’ (14.3 ± 0.8 Cultural Notes of ≥5 months at 1 °C and good shelf life after cm2). Observations suggest it is less vigorous storage. Blind hedonic sensory evaluations than ‘Gala’. ‘SPA440’ sets well and must be thinned, were run between 49 and 68 d after harvest, Shape. The crown is rounded and spread- but is less prone to oversetting than its sibling according to Hampson et al. (2000), over 6 ing. ‘8S6923’ (Aurora Golden Gala). If grown harvest years using commercial cultivars as Bearing habit. ‘SPA440’ bears chiefl y on on the superspindle system, the trees should standards. In these tests, the texture and fl a- spurs and short shoots. It has some bare wood. not be cropped heavily until they reach their vor of Nicola were liked more than those of The trees are regular bearing if thinned, have desired height. ‘Fuji’ or ‘Royal Gala’. In appearance it scored negligible preharvest fruit drop and good Some stem end russet is characteristic but higher than ‘Fuji’ but lower than ‘Royal Gala’. precocity. it does not normally break over the shoulders In separate blind panels, 12 trained judges Branch angle. Branch angles are mostly of the fruit. The exception is fi rst-year fruit, evaluated the degree or intensity of various near 90°. where russet may be so severe as to make the attributes (Fig. 3) relative to standards. At- Productivity. The productivity of trees on fruit unsaleable. ‘SPA440’ has not yet been tribute intensity was rated between 56 and 90 M.9 is slightly less than ‘Fuji’, but with similar tested in eastern North America, but caution is d after harvest of Nicola, depending on the yield effi ciency.