Biological kontrol of rhizoctonia solani kühn. with rhizobacteria isolated from different soil

In this study, the biological control activities of the bacteria strains, which have been isolated from the volcanic, sandy salty soils and Ebu Cehil plant (Calligonum polygonoides L. subsp. comosum (L'Hér.) were investigated against isolates of Rhizoctonia solani causing root rot in beans. As the result of the isolation 83 strains were obtained and the bacteria were identified by biochemical tests and fatty acid methyl esterase analyses. In the in vitro experiments, 20 strains from among 83 bacteria strains were found to be effective and it was determined that these strains inhibited the mycelial growth by forming a prevention zone ranging between 0,1 cm and 2,4 cm. The prevention rate of bacteria strains against pathogen isolates was found to range between 50%-66% maximum. In the in vivo pot experiments, the bacteria strains were found to successfully inhibit the disease development compared to the control group. The HV43, HV34, HT30 and HT21 strains were determined to prevent the onset of disease with an effectiveness of 100%. Keywords: Bean (Phaseolus vulgaris L.), Rhizoctonia solani, Biological control, Calligonum polygonoides L.