Rootstocks for Valencia, Vernia and Hamlin Evaluated at Venus, FL

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

June 2, 2022 - posted
CREC/USDA Citrus Plant Improvement

Rootstock Evaluations, Venus - Description

The cooperator agreed to plant four trials identified herein by scion where H= Hamlin, V=Valencia and numbers indicating the year the trial was planted along with the grove [Block] location.  All trees, with one noted exception, were raised in the cooperator's private nursery from seed provided from several sources, but mostly by the CREC Citrus Plant Improvement team.

• V2015/11.  This trial consists of Valencia trees.
• V2017/45.  This trial consists of a mixture of Valencia [mostly] and Vernia trees.
• H2016/59.  The trees for this trial were obtained as extras from the private nursery of another company.  
• H2016/60.  Routine data are not being collected from this trial because of severe problems with HLB probably because of weak tree growth resulting from poor quality irrigation water.

Rootstock Evaluations, V2015/11 - Summary

• Location: Venus, FL.
• Scion: Valencia
• Rootstocks: see Table 1.
• Date Planted: 2015
• Design:
  • Randomized complete-block
  • Replications: 3
  • Plot size: variable, 20-272 trees.
  • Spacing:  9 x 21  ft. = 230 trees/acre
• Data:
  • 2017/18: Trunk diameter, canopy diameter and volume.
  • 2018/19: Yield, tree height, trunk diameter, canopy diameter and volume.
  • 2019/20: Yield, tree height, trunk diameter, canopy diameter and volume.
  • 2020/21 & 2021/22: Yield, tree height, trunk diameter, canopy diameter and volume, productivity efficiency and juice quality: Brix, ratio and color. Correlation coefficient: Trunk diameter [ft.] vs Tree height [ft.], Trunk diameter [ft.] vs Canopy volume [ft3.] and Canopy diameter [ft.] vs Tree height [ft.].
• Trial status: ACTIVE

Rootstock Evaluations, V2017/45 - Summary

• Location: Venus, FL.
• Scion: Valencia & Vernia.
• Rootstocks: see Table 2.
• Date Planted: 2017
• Design:
  • Randomized complete-block
  • Replications: 1
  • Plot size: variable, 12 – 20 trees.
  • Spacing: 9 x 21 ft. =  230 trees/acre
• Data:
  • 2020/21: Yield, trunk diameter, canopy diameter and volume and productivity efficiency.
    Correlation coefficient: Trunk diameter [ft.] vs Tree height [ft.], Trunk diameter [ft.] vs
    Canopy volume [ft3.] and Canopy diameter [ft.] vs Tree height [ft.].
• Trial status: ACTIVE
  
  
  

Rootstock Evaluations, H2016/59 - Summary

• Location: Venus, FL.
• Scion: Hamlin
• Rootstocks: see Table 3.
• Date Planted: 2016
• Design:
  • Randomized complete-block
  • Replications: 4
  • Plot size: variable, 10 – 16 trees.
  • Spacing: 8 x 21 ft. = 259 trees/acre
• Data:
  • 2018/19: Tree height, trunk diameter, canopy diameter and volume.
  • 2020/21: Yield, Tree height, trunk diameter, canopy diameter and volume. Correlation coefficient: Trunk diameter [ft.] vs Tree height [ft.], Trunk diameter [ft.] vs Canopy volume [ft3.] and Canopy diameter [ft.] vs Tree height [ft.].
• Trial status: ACTIVE
  

Rootstock Evaluations, H2016/60 - Summary

• Location: Venus, FL.
• Scion: Hamlin
• Rootstocks: see Table 4.
• Date Planted: 2016
• Design:
  • Randomized complete-block
  • Replications: 4
  • Plot size: 20 trees
  • Spacing: 8 x 21 ft. = 259 trees/acre
• Trial status: INACTIVE