For pathogenicity testing, three month-old seedlings of C. papaya (cv. Sekaki) were infected with the bacterial suspension to determine the causative agent. Leaves of experimental plants were inoculated by pricking their abaxial surface with a sterile needle and injection with 50 μL of the inoculate suspension at a concentration of 1 × 108 CFU per mL into the apex of the seedlings, according to standard techniques described by [15]. Control plants were similarly inoculated with sterile water. Plants were incubated under greenhouse conditions at temperatures between 28 °C and 32 °C in the day and 25 °C and 28 °C at night. Using the same technique, bacteria were reisolated once symptoms appeared. Selected biochemical study of this bacteria was performed according to Gardan et al. [5,16] and the bacterial strain was identified using the API 20E system (BioMérieux, USA). Negative staining protocols for transmission electron microscopy were carried out as described by Lee and Taylor [17