After presenting work on exposure to CLas to the Operations Subcommittee, we were asked if results from that project could help inform what size the delimitation zone should be around an HLB+ tree. This project aimed to answer that question, and the resulting analysis proposed that the delimitation radius for tree surveys around an HLB+ tree be reduced from 400m to 300m. This change was suggested based on the geographic distribution of all trees confirmed to be positive for huanglongbing (“HLB+”) by March 2020, based on a methodology previously used by the CPDPC to make operational decisions.