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

South Ridge Valencia Rootstock Trial - Description Two standard Valencia clones, 55-4 and 1-14-19, 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

South Ridge Valencia Rootstock Trial Location: Lake Placid Scion: Valencia clones 55-4 and 1-14-19 Rootstocks: 8 rootstocks: 4 for both scion clones and additional 2 for 55-4 and 2 for 1-14-19. Date Planted: May 2014 Design: Randomized complete-block. Replications - 2 to 4 Plot size - 4-20 trees for each scion/rootstock combination Spacing - 7.5 x 22 ft. Data: 2017-18 : Juice quality 2018-19: Yield, tree size and health ratings CREC Citrus Plant Improvement

2017-18 South Ridge Valencia Rootstock Trial – Juice quality data combined over the two clones, March 2018 CREC Citrus Plant Improvement

2017-18 South Ridge Valencia Rootstock Trial – Juice quality data combined over the two clones, March 2018 CREC Citrus Plant Improvement

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

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

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

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

2018-19 South Ridge Valencia Rootstock Trial – Mean tree size and health ratings + std.dev., October 2018 * CREC Citrus Plant Improvement

C-54[55-4] C-22[55-4] FA-517[55-4] C-146[55-4] Willits[55-4] FA-5[1-14-19] C-57[55-4] C-146[1-14-19] FA-13[1-14-19] Willits[1-14-19] C-57[1-14-19] C-22[1-14-19] South Ridge Valencia Rootstock Trial – Heat Map 2018-19 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