1. South Ridge Valencia Rootstock Trial
Dr. Bill Castle – Dr. Fred Gmitter - Dr. Jude Grosser
September 6, 2019
CREC Citrus Plant Improvement

2. South Ridge Valencia Rootstock Trial - Description
Two standard Valencia clones, 55-4 and , are combined with the California C- series [C-22, Bitters, C-54 Carpenter, C-57 Furr and C-146] rootstocks along with Willits citrange [size-controlling] and the Spanish series FA-5, 31 and 517 in this trial. Planting took place in May 2014 in a cooperator site located just west of downtown Lake Placid. The objectives are to compare two scion clones of the relatively tolerant Valencia sweet orange primarily for HLB response, and to evaluate the horticultural traits of these rootstocks which are all included in a series of trials placed throughout Florida; thus, this trial can be viewed as one of a network of several designed to expand the base of evaluation.
CREC Citrus Plant Improvement

3. South Ridge Valencia Rootstock Trial
Location: Lake Placid
Scion: Valencia clones 55-4 and
Rootstocks:
8 rootstocks: 4 for both scion clones and additional 2 for 55-4 and 2 for
Date Planted: May 2014
Design: Randomized complete-block.
Replications - 2 to 4
Plot size trees for each scion/rootstock combination
Spacing x 22 ft.
Data:
: Juice quality
: Yield, tree size and health ratings
CREC Citrus Plant Improvement

4. South Ridge Valencia Rootstock Trial – Juice quality data combined over the two clones, March 2018
CREC Citrus Plant Improvement

5. South Ridge Valencia Rootstock Trial – Juice quality data combined over the two clones, March 2018
CREC Citrus Plant Improvement

6. 2017-18 South Ridge Valencia Rootstock Trial - Juice quality: Mean + std.dev., March 2018
CREC Citrus Plant Improvement

7. 2017-18 South Ridge Valencia Rootstock Trial – Juice Acid: Mean + std
South Ridge Valencia Rootstock Trial – Juice Acid: Mean + std.dev., March 2018
CREC Citrus Plant Improvement

8. 2017-18 South Ridge Valencia Rootstock Trial – Mean juice Color + std
South Ridge Valencia Rootstock Trial – Mean juice Color + std.dev., March 2018
CREC Citrus Plant Improvement

9. 2018-19 South Ridge Valencia Rootstock Trial – Mean Yield + std. dev
South Ridge Valencia Rootstock Trial – Mean Yield + std.dev. [boxes/tree], March 2019
CREC Citrus Plant Improvement

10. South Ridge Valencia Rootstock Trial – Mean tree size and health ratings + std.dev., October 2018 *
CREC Citrus Plant Improvement

11. C-54[55-4]
C-22[55-4]
FA-517[55-4]
C-146[55-4]
Willits[55-4]
FA-5[ ]
C-57[55-4]
C-146[ ]
FA-13[ ]
Willits[ ]
C-57[ ]
C-22[ ]
South Ridge Valencia Rootstock Trial – Heat Map Tree Health and Size Ratings for each clone [October 2018] Data collected from 5 year old trees
Better one
Heat Map Interpretation
Color coding is used to better visualize the relative ratings for tree health and size of two ‘Valencia’ orange clones on each of the rootstocks. A high (Best) rating is in blue and low (Worst) rating is in red. The other colors represent the values between high and low according to the color scale. For tree size, dark blue indicates a large tree, green a medium-sized tree and red a relatively small tree.
Med
High rating
Low rating
Medium rating
CREC Citrus Plant Improvement