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Not AvailableThe genetic diversity of Beauveria bassiana isolated from the different ecosystem of Tamil Nadu was analyzed. Totally fifteen isolates were used in this study. The genetic variability and relationship among 15 isolates were analyzed using 15 Random Amplified Polymorphic DNA (RAPD) markers. Among 15 primers used, six primers viz., OPA02, OPF01, OPX07, OPA03, OPZ19 and OPG19 showed 100 percent polymorphism. The relationships among the isolates were examined and represented as dendrogram by using UPGMA clusters. Results revealed that similarity coefficients of B. bassiana isolates based on RAPD markers ranged from 42.00 to 86.00 percent. The maximum of 85 percent similarity was observed between the isolates B23 and B24. All isolates have significantly different from one another. Overall we concluded that RAPD was found to be better in assessing genetic diversity among B. bassiana isolates.Not Availabl