Part B – The UF/CREC-Citrus Improvement Program’s Field Trial Evaluations (Complementary to Part A- the UF/CREC Core Citrus Improvement Program)

Part B - The UF/CREC-Citrus Improvement Program's Field Trial Evaluations (Complementary to Part A- the UF/CREC Core Citrus Improvement Program)

Report Date: 12/15/2020
Project: 18-039-C   Year: 2020
Category: Plant Improvement
Author: Jude Grosser
Sponsor: Citrus Research and Development Foundation

 Tree health index data was collected from the following trials: IMG, Citra, Steve Brewer (Land-O-Lakes scion trial), Banack, Hidden Golf Course (multi-scion trial), Smoak, Wheeler Bros., Peace River, and Greene Citrus (lemon trial). All ‘gauntlet’ trees were scored for health index; large fruit size was noted on a few selections that also had exceptionally healthy trees. Tree size/canopy volume data was collected from the Orie Lee OLL clone/rootstock trial. Our field crew assisted with roof repairs to our certified greenhouses and to our repository; this was necessary to maintain their legal status as sources for pathogen-free trees to be planted across the state. Propagation of best ‘gauntlet’ rootstocks: Additional cuttings were produced from 3 promising SugarBelle hybrids and two S11 (salt tolerant Pummelo x Cleo) x trifoliate orange 50-7 hybrids.  Two large grapefruit/rootstock experiments, including all of our PTP red grapefruit clones and new candidate rootstocks were planted with Bryan Paul citrus and English Bros. Citrus (many of the trees for the English Bros. trial were propagated by our team at the CREC, all others by Briteleaf Nursery).  Significant emphasis was placed on data analysis and entry onto the website:Trials posted or updated in the website: August-September-October                                    Trial          Online Title                                                                          Notes         1         Basinger ‘Vernia’ Rootstock Trial                                             Format and presentation updated         3         Indian River ‘Marsh’ Grapefruit Rootstock Trial                Format and presentation updated         4         Indian River ‘Vernia’ Rootstock Trial                               Added: 2019-20 Yield; HLB rating         5         Indian River Lemon Rootstock Trial                               Format and presentation updated         8         Peace River ‘Valencia’ Rootstock Trial                               Added 2019-20 Yield and HLB rating and RSTK table,                                                                                                              2020/21 HLB rating         16         St. Helena Rootstock Survey Trial – Addendum                Added 2019-20 Valencia & Vernia PS/box, PS/acre, 7y cumTrials worked on during August-September-October – data analyses                           Trial          Online Title                                                                             Notes         2         Waverly Scion Rootstock Trial                                                Added: 2020-21  HLB rating          5         Indian River Lemon Scion Trial with Two Rootstocks     Format and presentation updated and new data         6         Large-scale ‘Hamlin’ and ‘Valencia’ Rootstock Trials      Added 2019/20:  evaluation of all parameters.         7         Multi-Sweet Orange SW Flatwoods Rootstock Trial       Updated         12         Charlotte County Multi-Scion Rootstock Trial                    Added 2019-20 and 2020-21 Tree health rating         15         South Ridge Valencia Rootstock Trial                                   Added 2019-20 Yield and fruit drop and  2020-21:                                                                                                                  HLB rating         23         Indian River [IR] Minneola Rootstock Trial                    Added 2020-21 HLB rating and % of Dead trees.         25         Fellsmere Scion-Rootstock Trial# 25_12-6-20                    Added HLB Ratings, size  Jan 2020 and Oct 2020                  MAC City Block                                                                               New data, HLB rating etc.                  Hidden Golf Trailer Park Trial                                                 2018-19 Yield, HLB and size ratings, 2019-20 HLB rating                  Cutrale Amelia grove                                                                Started organizing data: canopy diameter, tree size, etc.                                


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