In 2018, bacterial leaf blight was reported in Florida on a commercial field of pak choi. Bacteria from symptomatic plants were isolated, purified, and stored in -80°C. Four unknown isolates were obtained, because they fluoresce on Kings B media, they are thought to be Pseudomonas spp.The purpose of this project was to confirm the pathogenicity of these isolates. It was found through the pathogenicity test that all four isolates are pathogenic on pak choi.