Asian Citrus Psyllid (ACP) is the vector of HLB which is primarily responsible for the disease spread. Controlling ACP invasion could potentially minimize the disease spread and crop loss. This project is aiming at developing an organo-silica based composite film (OSCF) barrier material which will serve as an ACP protectant once spray applied. Preliminary ACP trial results conducted on some of the earlier versions of OSCF materials were promising. The OSCF material was applied on 20 citrus plants on every 2-3 weeks and compared against an industrially available compound, ActigardTM (applied every 30 or 60 days interval). Comparable efficacy was observed with an infection rate as low as 68% for OSCF and 55 ‘ 75% for ActigardTM. Both the OSCF and ActigardTM materials reduced infection in comparison to the untreated control group which expressed an infection rate of 85%. In this reporting period, we have further optimized the OSCF materials which involved two different USEPA approved environmentally-friendly polymers and plant micronutrient based ionic cross-linkers. A total of six different version of OSCF materials have been evaluated for phytotoxicity using Vinca sp (an ornamental model plant which is highly susceptible to phytotoxicity) and Persian Lime. As expected, none of these OSCF materials showed any tissue damage. To address any concerns related to heat trapping potential of OSCF film material once spray applied, we have performed a series of studies on Persian Lime. Surround’, a recommended pest deterrent based on Kaolin Clay was used as a standard control. Four of these OSCF materials showed plant temperature comparable to Surround’ standard after application. Further optimization process will involve adjustment of OSCF spray rate. A couple of the most promising OSCF formulations will be delivered for greenhouse testing against ACPs by the end of this year.