Blueberry plant named ‘FL06-377’

Abstract

‘FL06-377’ is a new and distinct southern highbush blueberry (Vaccinium corymbosum L.) variety distinguished by a very low chilling requirement, high evergreen leaf retention, upright growth habit, and fruit that are firm, with a small, dry picking scar.

Description

Latin name of the genus and species of the plant claimed: Vaccinium corymbosum L.

Variety denomination: ‘FL06-377’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct hybrid variety of southern highbush blueberry (Vaccinium corymbosum L.) named ‘FL06-377’. ‘FL06-377’ is a blueberry clone distinguished by its low chilling requirement, vigorous, upright bush, and large, firm berries that ripen from mid-March through late-April when grown in central Florida under evergreen conditions. Several hundred plants of ‘FL06-377’ have been propagated by softwood stem cuttings in Gainesville, Fla., and the resulting plants have all been phenotypically indistinguishable from the original plant. Contrast is made to ‘Emerald’ (U.S. Plant Pat. No. 12,165), an important variety widely planted in the southeastern United States. The claimed plant is important because it is more upright and has a higher tendency towards evergreeness than ‘Emerald’. Fruit of ‘FL06-377’ are earlier maturing and firmer than that of ‘Emerald’. ‘FL06-377’ has higher total yield than ‘Emerald’ when grown as an evergreen plant.

‘FL06-377’ originated as a seedling from a cross between ‘FL03-19’ (unpatented) as the female (seed) parent and ‘FL99-37’ (unpatented) as the male (pollen) parent. This cross was made as part of a breeding program in a greenhouse in Gainesville, Fla., in February 2003. The seedling was planted in a high-density field nursery located in Citra, Fla., in May 2004, and the first fruit were evaluated in April 2005. After the second year of fruiting in the field, in the spring of 2006, ‘FL06-377’ was asexually propagated by softwood stem cuttings, and an experimental 15-plant test plot was established as part of a variety test in Windsor, Fla., in February 2007. Based on the growth, yield, and fruit quality of this plot, ‘FL06-377’ was repropagated by softwood stem cuttings and experimental test plots ranging from 5 to 50 plants were established near Arcadia, Citra, Interlachen, Haines City, and Windsor, Fla. These plots have been observed during flowering and ripening each year, and no mutations or off-type plants have been observed.

‘FL06-377’ differs from the proprietary parent ‘FL03-19’ (unpatented) in that ‘FL06-377’ has a lower chilling requirement, and higher yield. ‘FL06-377’ differs from the proprietary parent ‘FL99-37’ (unpatented) in that ‘FL06-377’ is earlier ripening and has a lower chilling requirement. ‘FL06-377’ differs from the commercial variety ‘Emerald’ (U.S. Plant Pat. No. 12,165), an important variety widely planted in the southeastern United States, in that ‘FL06-377’ blooms later and has a lower chilling requirement that allows it to be grown as an evergreen plant in regions conducive to this management system. ‘FL06-377’ berries ripen earlier and are firmer than ‘Emerald’ berries.

SUMMARY OF THE INVENTION

Blueberry variety ‘FL06-377’ exhibits outstanding and distinguishing characteristics when grown under normal horticultural practices in Florida, including:

• • (1) a low chilling requirement, particularly for the flower buds;
  • (2) a vigorous, upright bush;
  • (3) early ripening (50% ripe berries in North Florida around April 25, and April 10 in Central Florida); and
  • (4) large, firm berries with a small, dry picking scar.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying photographs show typical bush, flower, and fruit characteristics for ‘FL06-377’. Colors shown are as true as can be reasonably reproduced by photographic procedures and may differ from those cited in the detailed description, which accurately describes the colors of ‘FL06-377’.

FIG.1—Shows several clusters of opening ‘FL06-377’ flowers during the early stages of flowering in February.

FIG. 2—Shows several clusters of ‘FL06-377’ berries during the fruit ripening season.

FIG. 3—Shows a close-up of harvested ‘FL06-377’ berries.

FIG. 4—Shows a close-up of mature ‘FL06-377’ leaves with a scale bar.

FIG. 5—Shows a four-year-old ‘FL06-377’ plant in April with the upright plant architecture visible.

FIG. 6—Shows a close-up of a three-year-old ‘FL06-377’ plant with ripening clusters of berries in Windsor, Fla.

DETAILED BOTANICAL DESCRIPTION

The following detailed description sets forth the distinctive characteristics of ‘FL06-377’. The data that define these characteristics were collected from asexual reproductions carried out in Florida. The plant history was taken on a plot of 50 four-year-old plants growing in a commercial field near Windsor, Fla. Certain characteristics may vary with plant age. ‘FL06-377’ has not been observed under all possible environmental conditions, and the measurements given may vary when grown in different environments. Where means are given, the sample size was 20. Color descriptions are based on The Royal Horticultural Society (R.H.S.) Colour Chart by The Royal Horticultural Society, London, Fifth Edition, 2007. When the R.H.S. color designations differ from the accompanying photographs, the R.H.S. color designations are accurate.

PHENOTYPIC DESCRIPTION OF VACCINIUM CORYMBOSUM L. (‘FL06-377’)

• Plant:
  • • Plant vigor.—High. Vigor is greater than ‘Emerald’ (U.S. Plant Pat. No. 12,165).
    • Growth habit.—Upright.
    • Flower bud density (number) along flowering twigs in January.—High.
    • Twigginess.—Medium.
    • Tendency toward evergreenness.—High.
    • Productivity.—In northeast Florida, ‘FL06-377’ produces 1.5 to 2.5 kg per season from plants 3 years or older. In Central Florida, ‘FL06-377’ produces over 3.5 kg per season from plants 3 years or older.
    • Chilling requirement.—Based on the forcing canes in a greenhouse, the chilling requirement of floral buds is expected to be approximately 200 hours below 7° C. when grown as a deciduous plant. When evaluated in trial sites receiving an average less than 300 hours below 7° C., ‘FL06-377’ has performed well.
    • Cold hardiness.—‘FL06-377’ has not been grown in temperate climates with extremely cold winter temperatures. Plants have survived winter freezes of −6° C. with minimal damage.
    • Ease of propagation.—‘FL06-377’ has only been propagated from softwood stem cuttings, where the rooting percentage has greater than 80% and comparable to other varieties.
• Trunk and branches:
  • • Suckering tendency.—Low. Three-year-old plants typically have 5 to 7 major canes arising from a crown 30 cm in diameter.
    • Surface texture (of strong, 6-month-old shoots observed in January).—Smooth.
    • Surface texture (of 3-year-old and older wood).—Rough.
    • Color of new twigs observed in the field.—Yellow-green 144A.
    • Color of 3-year-old, rough-textured canes.—Greyed-brown N199C.
    • Internode length (strong, upright shoots measured in January).—Mean of 12.7 mm.
• Leaves:
  • • Length (including petiole, from tip of petiole to end of blade).—Mean of 7.9 cm.
    • Width (at widest point).—Mean of 2.6 cm.
    • Shape.—Narrow elliptic, with an attenuate base and acute tip.
    • Margin.—Entire with a few crenate indentations toward the base.
    • Color.—Upper surface: Green 139A. Lower surface: Green N138B.
    • Pubescence.—Upper surface of leaves: Absent. Lower surface of leaves: Absent. Margins: Absent.
    • Relative time of leafing versus flowering.—When not treated with hydrogen cyanamide in mid-winter, leafing and flowering often occur concurrently.
• Flowers:
  • • Arrangement.—Flowers are arranged alternately along a short, leafless, deciduous branch.
    • Fragrance.—None.
    • Shape.—Urceolate.
    • Flowering period.—Mean date of 50% open flowers in Citra, Fla. is February 7; averages 3 days later than ‘Emerald’.
    • Cluster (tight, medium, loose).—Loose.
    • Number of flowers per cluster.—Mean of 5.8.
    • Pedicel.—Length at time of anthesis: Mean of 8.3 mm. Color at time of anthesis: Yellow-green N144C.
    • Peduncle.—Length at time of anthesis: Highly variable, mean of 15.1 mm. Color at time of anthesis: Yellow-green 145A with Greyed-orange 176A on sun-exposed side.
    • Calyx.—Surface texture: Smooth. Diameter: Mean of 5.6 mm. Color: Yellow-green 146A to Yellow-green 147C on tips of calyx lobes.
    • Corolla.—Diameter: Mean of 7.1 mm. Length (from pedicel attachment point to corolla tip excluding the pedicel): Mean of 11.5 mm. Aperture diameter: Mean of 4.1 mm. Texture: Smooth. Color: White 155A.
• Reproductive organs:
  • • Style.—Length (top of ovary to stigma tip): Mean of 9.7 mm. Color: Yellow-green 145B. Location of tip of stigma relative to lip of the corolla — Stigma tip is approximately 1 to 3 mm below the corolla lip.
    • Anthers.—Color: Greyed-orange 164A. Pollen — Abundance of shed: High. Pollen germination: Typically greater than 90%. Color: Greyed-yellow 162D.
    • Self-fruitfulness.—Low to medium. Planting in field configurations that promote cross fertilization with other southern highbush varieties is recommended for all southern highbush blueberry plants grown in Florida.
• Fruit:
  • • Mean date of 50% harvest in Citra, Fla.—April 25.
    • Diameter of calyx aperture on mature berry.—Mean of 6.4 mm.
    • Size and shape of calyx lobes on mature berry.—Small lobes, semi-erect, and incurving. Medium calyx basin.
    • Pedicel length on ripe berry.—Mean of 10.1 mm.
    • Detachment force for ripe berries (easy, medium, hard).—Medium.
    • Number of berries per cluster.—Mean of 5.1.
• Berry:
  • • Cluster (tight, medium, loose).—Medium to loose.
    • Weight (on well-pruned plants).—Mean of 2.7 g.
    • Height.—Mean of 12.7 mm.
    • Width.—Mean of 18.4 mm.
    • Shape.—Oblate.
    • Surface color of mature berries ripe on the plant.—Violet-blue 97B.
    • Surface color of ripe berry after polishing.—Black 203D.
    • Immature berry color, with bloom.—Greyed-green 194C.
    • Immature berry color without bloom.—Yellow-green 146C.
    • Surface wax.—High. The surface wax on ‘FL06-377’ is very persistent and resists abrasion.
    • Pedicel scar.—Small and dry. Mean of 2.1 mm.
    • Firmness.—Very firm.
    • Flavor.—Sweet when ripe, but can be tart before fully mature.
    • Texture.—Very firm, juicy, small seeds, and no stone cells present.
• Seeds:
  • • Color of dried seeds.—Greyed-orange 165B.
    • Weight of well-developed dried seed.—Mean of 0.4 mg.
    • Length of well-developed dried seed.—Mean of 1.9 mm.
    • Width of well-developed dried seed.—Mean of 1.1 mm.
• Use: ‘FL06-377’ produces southern highbush blueberries suitable for both the fresh and processed fruit markets. ‘FL06-377’ has performed best in trials when grown under an evergreen management system.
• Resistance to diseases, insects, and mites: ‘FL06-377’ has grown vigorously and shows medium to good bush survival in the field. It appears to have only average resistance to stem blight (Botryosphaeria spp.) and root rot (Phytophthora cinnamoni), with some young plants dying soon after planting. Plants are moderately susceptible to bacterial leaf scorch (Xylella fastidiosa), with cane dieback symptoms observed on less than 10% of 4-year-old plants. Susceptibility to bacterial leaf scorch is greater than ‘Emerald’ (U.S. Plant Pat. No. 12,165). The reaction of ‘FL06-377’ to the fungal species that cause summer leaf spots is typical of other southern highbush varieties, and fungicide applications may be needed after harvest to reduce foliar diseases and retain leaves as an evergreen plant. ‘FL06-377’ is susceptible to scale insects.

Claims

1. A new and distinct southern highbush blueberry plant named ‘FL06-377’, as illustrated and described herein.