1. Please state project objectives and what work was done this quarter to address them: The overall goal is to discover which of the seven (7) grapefruit scion and six (6) rootstock combinations planted in 41 blocks perform well under the endemic HLB disease pressure in Florida. The objectives are to 1) measure tree growth (using drone technology) and ratings of canopy thickness, yellowing, and HLB disease symptom severity, and 2) estimate fruit drop and tree yields as they come into production through preharvest fruit counts and measurement of fruit weight, size distribution and fruit quality from representative fruit samples. Work done: In February 2024 we continued with the fruit sampling for sizing and external and internal fruit quality analysis, to calculate fruit yield, plus the estimation of fruit drop by counting fruits on the tree and on the ground. In March and April 2024, we processed and analyzed the data collected in the previous months, and completed collection of disease index ratings, and intiated documentation of tree growth. A program is been developed to extract the data from the drone spreadsheets. Yield and disease index data were presented to Florida Citrus Show attendees on April 3, 2024.Preliminary results were presented by Dr. Zambon at the Polytechnic Univeristy of Valencia on May 22, 2024, and to the Valencian Grower’s Association on the May 23, 2024. Drone data was collected on May 29, 2024. 2. Please state what work is anticipated for next quarter: Next quarter will comprise of the drone data analysis, continuation of the ground documentation of tree growth and initiating the HLB based on a quadrant-evaluation rating (disease index). 3. Please state budget status (underspend or overspend, and why): Spending delayed a little to allow for the second round of drone flights and maintain personnel until year two funds are available. A no-cost extension was approved. Expenses for the other half of the drone measurements will be paid upon receipt of the invoice, expected early June.