Horticultural & Management

Directed Research Solicitation: Evaluating different rates of oxytetracycline administered by trunk injection in mature sweet orange trees

Testing the injection of oxytetracycline (OTC) in a pH neutral solution

Determine optimal timing for application of fertilizer to improve fruit quality and reduce preharvest drop

OTC Directed Research Solicitation: Use of CRDF Rootstock Trial Locations for Testing Bactericides Inserted into Trees Through Systemic Delivery Devices

Management of tree health and huanglongbing disease pressure using advanced Zn formulations

Reducing fruit drop by altering hormonal responses within the tree through nutritional and hormonal therapies: a mechanistic affordable approach

Determining best timing for Brassinosteroid (Brs) application to achieve maximum beneficial effects on citrus tree health and fruit yield and quality

Directed Research Solicitation: Evaluating different rates of oxytetracycline administered by trunk injection in mature sweet orange trees

Testing the injection of oxytetracycline (OTC) in a pH neutral solution

Determine optimal timing for application of fertilizer to improve fruit quality and reduce preharvest drop

OTC Directed Research Solicitation: Use of CRDF Rootstock Trial Locations for Testing Bactericides Inserted into Trees Through Systemic Delivery Devices

Organic acids compared to conventional acidification for improved nutrient uptake and root physiology

1. Please state project objectives and what work was done this quarter to address them:

Objective 1: Determine effects of lowered soil pH on CLas populations and root physiology including internal root apoplast and vascular tissue pH.
We got our experiment in rhizotrons completed in September 2023. Sample processing and data analysis is under way. Root tracing and quantification of root traits will be completed in the next quarter. We should get the data processed and published in the next quarter or immediately following project completion.

Objective 2: Field test multiple acidification materials including organic acids for tree response CLas suppression, nutrient uptake, and root and vascular pH changes. In this quarter, we continued root sampling and soil pH determinations and applied final round of the treatments. We also finalized canopy determinatiions for trees used for the study.

2. Please state what work is anticipated for next quarter:
We will collect fruit yield and juice quality data in March/April 2024 to finalize objective 2 milestones.
We will get one article prepared and published in a refereed journal.

3. Please state budget status (underspend or overspend, and why):

The budget is on track and meeting the project milestones.

Management of tree health and huanglongbing disease pressure using advanced Zn formulations

Integrated management of sting nematode in newly planted citrus trees