This study was conducted to determine survival of Clavibacter michiganensis subsp. michiganensis (Cmm) in infested seed, soil, plant residue. Infected seeds rates were determined by plating seeds, which were infected with rifampicin-resistant Cmm isolate, on medium at monthly intervals. Also, seeds were planted and disease observations were made in plants to determine the ability of seed inocula to initiate disease. Infested soil was buried in test area within container and the bacterial density was calculated in samples taken during summer and winter months. Cmm-infected plant parts were buried in the soil and bacterial density was calculated by sampling in monthly periods. Based on the results of study, the survival rate of the pathogen in infected seed were decreased with increase in storage periods. The lowest survival rate of 17% was determined at the end of 370 day, but on the 400th day, Cmm was not recovered from infected seeds. It has been determined that pathogen could survive in infested soil for 15 and 30 days in summer and winter periods, respectively. Also, Cmm could survive for 30 days in plant residues in the soil. As a result, it has been determined that Cmm could not survive in soil and plant residues in Tokat province. However, it has been determined that the infected seeds are primary inoculum source and that inoculum in the seeds has ability to initiate disease. Therefore it is important to use clean seeds to reduce initial inoculum for disease management.