K-Gold

Pear

Denomination: 'K-Gold'
Previously Proposed Denomination: 'Canadian Gold'
Botanical Name: Pyrus communis
Applicant/Holder: Agriculture & Agri-Food Canada, Kentville
Atlantic Food & Horticulture Research Centre
32 Main Street
Kentville, Nova Scotia
B4N 1J5
Canada
Breeder: Charles G. Embree, Agriculture & Agri-Food Canada, Kentville, Nova Scotia
Agent in Canada: Agriculture & Agri-Food Canada
Office of Intellectual Property and Commercialization
6000 C&E Trail
Lacombe, Alberta
T4L 1W1
Canada
Tel: (403) 782-8126
Application Date: 2002-03-05
Application Number: 02-3007
Protective direction granted: 2002-03-05
Grant of Rights Date: 2010-11-26
Certificate Number: 3974
Grant of Rights Termination Date: 2028-11-26

Variety Description

Varieties used for comparison: 'Harovin Sundown', 'Bartlett' and 'Bosc'

Summary: The pubescence on the young shoot of 'K-Gold' is medium in density whereas it is weak on 'Harovin Sundown', 'Bartlett' and 'Bosc'. The stigma of 'K-Gold' is positioned above the stamens whereas they are positioned below the stamens on 'Harovin Sundown' and at the same level as the stamens on 'Bartlett'. The fruit of 'K-Gold' is large whereas it is medium sized in 'Harovin Sundown' and 'Bartlett' and small in 'Bosc'. The fruit stalk of 'K-Gold' has a strong curvature whereas it is absent or very weak on 'Harovin Sundown' and 'Bartlett'. The attitude of the fruit stalk in relation to the axis of the fruit of 'K-Gold' is oblique whereas it is straight in 'Harovin Sundown' and 'Bartlett'. The eye basin of 'K-Gold' at harvest is broad whereas it is medium in width on 'Harovin Sundown' and narrow on 'Bartlett' and 'Bosc'. 'K-Gold' matures late for consumption whereas it matures mid-season for 'Bartlett' and 'Bosc'.

Description:

TREE: strong vigour, medium branching, upright habit, begins flowering mid-season, late maturity for consumption

ONE YEAR OLD SHOOTS: straight growth, medium length of internode, orange brown colour on sunny side, medium number of lenticels
VEGETATIVE BUD: acute apex, markedly held out in relation to the shoot, large bud support
YOUNG SHOOTS: medium amount of anthocyanin colouration of growing tip, medium density of pubescence on upper third

LEAF: downwards attitude in relation to shoot, large length/width ratio, obtuse base, right-angled apex, long pointed tip, bluntly serrate margin, medium depth incisions, medium curvature of longitudinal axis
STIPULES: present, short distance from basal attachment

FLOWER: mainly on spurs, medium length bud, stigma positioned above level of stamens
SEPALS: medium length, spreading in relation to corolla, green on immature fruit
PETALS: mainly touching with some overlapping, medium size, mainly circular with some broad ovate, mainly rounded with some cuneate base, short claw

FRUIT: long, large maximum diameter, medium length/diameter ratio, position of maximum diameter slightly towards calyx, large size, symmetric in longitudinal section, concave profile of sides
SKIN: yellow ground colour, medium sized amount of orange red over colour, no area of russet around eye basin or on cheeks, medium amount of russetting around stalk attachment
STALK: medium thickness, strong curvature, oblique attitude in relation to axis of the fruit, medium depth of stalk cavity
EYE BASIN, AT HARVEST: erect sepals, deep, broad, embossed relief around eye
FLESH: fine texture, firm, juicy
SEED: elliptic

PEST REACTIONS: susceptible to plum curculio (Conotrachelus nenuphar)
HERBICIDE TOLERANCE: resistant to Gramoxone and Simizine
PESTICIDE TOLERANCE: resistant to Maestro and Imidan

Origin & Breeding History: 'K-Gold', tested as 'S30-22-02', arose from the cross of 'Beierschmidt' and 'US505' made in the spring of 1966 at the Agriculture and Agri-Food Canada Research Centre in Kentville, Nova Scotia. It was planted in the field in the spring of 1968 and was selected and propagated for second stage evaluation in 1988. Following a very dry growing season of 2001, 'K-Gold' was found to have superior performance in the field. Selection criteria included fruit quality, shelf-life and harvest maturity.

Tests & Trials: Tests and trials for 'K-Gold' were conducted during the 2009 growing season at the Agriculture & Agri-Food Horticulture Research Center in Kentville, Nova Scotia. There were a minimum of 5 trees each of the candidate and reference varieties. The trial was planted in 2004 with trees spaced 3 meters apart within the row and approximately 5 meters apart between the rows.


Comparison tables for 'K-Gold' with reference varieties 'Harovin Sundown', 'Bartlett' and 'Bosc'

Leaf length (cm)

  'K-Gold' 'Harovin Sundown' 'Bartlett' 'Bosc'
mean 7.80 6.60 7.26 7.58
std. deviation 1.10 0.85 0.69 0.63

Petiole length (mm)

  'K-Gold' 'Harovin Sundown' 'Bartlett' 'Bosc'
mean 43.73 50.53 42.91 43.85
std. deviation 12.12 7.49 9.36 9.07

Length of fruit stalk (mm)

  'K-Gold' 'Harovin Sundown' 'Bartlett' 'Bosc'
mean 41.99 47.39 35.04 53.3
std. deviation 4.46 8.19 5.22 5.50

Click on image for larger view
K-Gold
Pear: 'K-Gold' (left) with reference varieties 'Harovin Sundown' (centre, left), 'Bartlett' (centre, right) and 'Bosc' (right)

Click on image for larger view
K-Gold
Pear: 'K-Gold' (left) with reference varieties 'Harovin Sundown' (centre, left), 'Bartlett' (centre, right) and 'Bosc' (right)

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