Directed research – Evaluation of different trunk injection devices and oxytetracycline formulations for efficacy against HLB, phytotoxicity, and feasibility

Directed research – Evaluation of different trunk injection devices and oxytetracycline formulations for efficacy against HLB, phytotoxicity, and feasibility

Report Date: 10/11/2022
Project: 22-001   Year: 2022
Category: Horticultural & Management
Author: Ute Albrecht
Sponsor: Citrus Research and Development Foundation

  1. Please state project objectives and what work was done this quarter to address them: Objectives: 1) Test the efficacy of different injection devices, 2) Determine the most effective formulation of OTC, 3) Determine the best month of injection and most appropriate OTC concentration based on tree size. Trial 1: Located in SW Florida (Duda) – 8-year-old Valencia/Carrizo trees.    – 2022 injections are completed. Fruit size evaluations were conducted trees were rated for HLB disease symptoms and canopy health.Trial 2: Located in SW Florida (Graves Bros) – 8-year-old Valencia/Kuharske trees.    – 2022 injections are completed. Fruit size evaluations were conducted and trees were rated for HLB disease symptoms and canopy health.Trial 3: Located on the east coast (Graves Bros) – 9 year-old Valencia/sour orange trees.    – 2022 injections are completed. Trees were monitored.Trial 4: Located on the east coast (Graves Bros) – 4-year-old Valencia/x639 trees.   – August injections were conducted. Trees were rated for HLB disease symptoms and canopy health.Trial 5: Located on the central ridge (King Ranch) – 4-year-old OLL-8/x639 trees.    – August injections were conducted. Trees were rated for HLB disease symptoms and canopy health.  2. Please state what work is anticipated for next quarter:Fruit drop countings and tree size measurements will be conducted. Fruit size evaluations in trial 1 will continue. Additional tree ratings and size measurements will be conducted.     3. Please state budget status (underspend or overspend, and why): Budget status is as anticipated (the majority of the budget will be for fruit analyses).  


Your browser does not support pdfs, click here to download the file.