1. Project C
Evaluation of citrus rootstock response to HLB in large-scale existing field trials
Principal Investigator (PI): Dr. Ute Albrecht (SWFREC)
Co-PIs: Dr. Jude Grosser, Dr. Fred Gmitter (CREC)

2. Large-scale ‘Hamlin’ and ‘Valencia’ Rootstock Trials
Site 1: Basinger (Highlands County)
Site 2: Lake Wales (Polk County)
Scion - Rootstocks:
Hamlin (52 rootstocks)
Valencia (48 rootstocks)
Date planted: September 2015
Plot size: 8 trees
Replications: mostly 6 or more
Spacing: 8 x 25 ft. (Basinger) and 8 x 22 ft. (Lake Wales)

3. UF Rootstocks Rootstock name Parentage Origin 6058 + 2071-02-2
SO+Rangpur x Cleopatra+Trifol. Or.
Florida (UF)
Amb + Benton
Amblycarpa + Benton citrange
Amb + Czo
Amblycarpa + Carrizo citrange
Changsha (UFR-6)
Changsha + Trifol. Or. 50-7
Changsha + Benton
Changsha + Benton citrange
Green 2 (UFR-17)
Nova+HBPummelo x SO+Carrizo
Green 3
Green 7
Orange 13
Nova+HBP x Cleo+Arg. Trifol. Or.
Orange 14
Orange 15 (UFR-3)
Orange 19 (UFR-4)
Nova+HBP x Cleo+Arg.Trifol. Or.
Orange 3 (UFR-1)
Orange 4 (UFR-2)
Sorp + Sh-991
SO+Rangpur x Cleo+Trifol. Or.
Wgft
White grapefruit + Trifol. Or. 50-7
White 1
Nova+HBP x Succari+Arg. Trifol.
White 3
White 4 (UFR-5)
B SOUR SO
B11R3T27
Flying Dragon x Duncan
B11R4T1
Flying Dragon x C. obovoidea
B11R4T13
B11R4T18
B11R4T22
N40R1T18
Flying Dragon x (Clementine x Duncan)
N40R1T2
Duncan x DPI 9-6
N40R1T25
N40R1T26
N40R2T19
N40R2T21
N40R2T24
N40R2T26
N40R3T26
N40R3T27

4. Other Rootstocks Rootstock name Parentage Origin C-146
Sunki Mandarin x Swingle
California (UCR)
C-22
Bitters Sunki x Swingle
C-54
Carpenter Sunki x Swingle
C-57
Furr Sunki x Swingle
FA-13
Cleopatra x Trifol. Or.
Spain (IVIA)
FA-2344 [02034]
Troyer x Cleopatra
FA-31
FA-418
Troyer x Common Mandarin
FA-5115
King Mandarin x Trifol.
FA-5128
King Mandarin x Trifol. Or.
FA-517
FA-5
FA-74
V-17
Volkamer lemon x Trifol. Or.
Swingle
Duncan x Trifol. Or.
Florida USDA
US-897
Cleopatra x Flying Dragon Trifol. Or.
SO = Sour Orange; Trifol. Or. = Trifoliate Orange; HBP = Hirado Buntan Pummelo; IVIA = Instituto Valenciano de Investigaciones Agrarias; UF = University of Florida; UCR = University of California, Riverside; USDA = United States Department of Agriculture. The “+” indicates somatic hybrid (allotetraploid) rather than diploid sexual hybrid.

5. Hamlin Basinger Dec 2018 Yield
Only rootstocks with a minimum replication of 3 are shown.
Average yield in trial:
13.6 pounds/tree

6. Hamlin Lake Wales Jan 2019 Yield
Only rootstocks with a minimum replication of 3 are shown.
Average yield in trial:
26.0 pounds/tree