Central Ridge Multi-Sweet Orange Scion Rootstock Trial

Dr. Bill Castle - Dr. Jude Grosser - Dr. Fred Gmitter

December 7, 2018CREC Citrus Plant Improvement

Central Ridge Multi-Sweet Orange Scion Rootstock Trial - Description

This replicated trial, planted in Dundee in 2013, consists of ‘Hamlin,’ ‘Valquarius’ and ‘Valencia’ on 11 rootstocks, including the best rootstocks from the Forner breeding program in Spain, C-series rootstocks from CA, and one tetraploid citrumelo from the UF/CREC breeding program. The goal is to identify superior sweet orange/rootstock combinations for the Ridge based on yield, juice quality and apparent HLB tolerance.

CREC Citrus Plant Improvement

Central Ridge Multi-Sweet Orange Scion Rootstock Trial

Location: Dundee

Scion - Rootstocks: Valquarius – Hamlin – Valencia on 11 rootstocks

Date planted: June 2013

Design: RCBD – 3 replications• Plot: 4-20 trees• Spacing: 12 x 22 ft.

Data collected:• Yield: 2015-16; 2016-17; 2017-18• HLB ratings 2016-17• Tree Size and Tree Health Rating (data not presented)• Juice data 2017-18

CREC Citrus Plant Improvement

Multi-Scion Rootstock Trial –Yield/tree [boxes] 2015-16, 2016-17 & 2017-18

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Scion:Rootstock(V:Valencia H:Hamlin Q:Valquarius)

Mean yield/tree (boxes) 2015-16 Mean yield/tree (boxes) 2016-17 Mean yield/tree (boxes) 2017-18

0 0.2 0.4 0.6 0.8 1 1.2

Mean yield/tree (boxes) 2015-16

Mean yield/tree (boxes) 2016-17

Mean yield/tree (boxes) 2017-18

Hamlin Valencia Valquarius

CREC Citrus Plant Improvement

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3.5

Scion: Rootstock(V: Valencia H:Hamlin Q:Valquarius) CREC Citrus Plant Improvement

Central Ridge Multi-Sweet Orange Scion Rootstock Trial –Cumulative 3-yr yield/tree [boxes/tree]: 2015-16, 2016-17 & 2017-18

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Scion: Rootstock(V: Valencia H:Hamlin Q:Valquarius)

Mean yield/tree (boxes) HLB Fruit drop

2016-17 Central Ridge Multi-Sweet Orange Scion Rootstock Trial –Yield [boxes/tree], HLB and Fruit Drop Rating

CREC Citrus Plant Improvement

Q1789

Q1810Q1846

Q1850

Q1853

H1789

H1810

H1845

H1846

H1849

H1850

H1853

H1855

H1856

H1858

2017-18 Central Ridge Multi-Sweet Orange Scion Rootstock Trial –Heat Map Juice data

Data collected from 4-year old trees

Valencia(April 2018)

Valquarius(Jan 2018)

Hamlin(Jan 2018)

V1789

V1810

V1845

V1846

V1849

V1850

V1853

V1855V1856

V1858

1789 Crocker pummelo x TF

1810 WGFT + 50-7

1845 C-22: Bitters

1846 C-57: Furr

1849 Willits citrange

1850 FA (02033) Troy. x TF x Cleo

1853 Forner (03015) Cleo x TF (FA-5)

1854 Forner (030113) Cleo x TF (FA 13)

1855 Forner (030126) Cleo x TF

1856 Forner (030142) Cleo x TF (FA-42)

1858Forner (05017) Kiing mand. X TF (FA-517)

CREC Citrus Plant Improvement

Med

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Heat Map Legend