1. Please state project objectives and what work was done this quarter to address them: Specific objectives are: 1) To determine the right timing for Zn and K treatments to minimize fruit drop.Harvest in Valencia was done in late April. We performed treatments at four different dates: on early September 2023, a October 2023, December 2023, and February 2024. Yields from plots treated with Zn and Zn+K in December were significantly higher than non-treated controls. Our yield numbers were 16 pounds of fruit per tree in nontreated controls, 24 pounds of fruit per tree in Zn-treated trees, and 27 pounds of fruit per tree in Zn+K treated trees. These differences were statistically significant at p<0.05. We found that cummulative fruit drop declined when treatments were performed in December and February, which may explain why we had more yield with the December treatments. Yield in trees treated in February was higher in Zn+K although not siginificant at p<0.05. We have also measured canopy volume and we have seen an increase with Zn+K treatment in December: 2.88 m3 as compared to 2.28 m3 in controls. This is a 26% increase in canopy that may explain the increase in yield with this treatment performed at this time.2) To determine effects of GA3 and 2,4D applications on fruit retention when applied at different times during fruit development.We harvested the Valencia and analyzed the harvest data of both varieties. GA+2,4 D treatment together significantly reduced the fruit drop by 18% in Valencia. No such effect was seen in Hamlin as the trees were harvested significantly early before the drop began. 3) To develop a strong and proactive outreach program. -Alferez F. New tools for growing citrus under endemic HLB, Collier Fruit Growers Association, Naples, April 15, 2024.-1 communication was submitted and accepted for the FSHS annual meeting in Orlando this year. 2. Please state what work is anticipated for next quarter: We are analyzing auxins in all samples collected in objective 1 and we are planning next season's treatments in objectives 1 and 2 3. Please state budget status (underspend or overspend, and why): Budget continues on track