Author(s):

Bandana Mayanglambam, Gayatri Biswal and Sudeepta Pattanayak

Abstract: Ralstonia solanacearum (Smith) Yabuuchi et al. is considered one of the most destructive plant pathogens in tropical, subtropical and temperate regions worldwide. It is a highly diverse and adaptive bacterium that differs in host range, geographical distribution, pathogenicity, epidemiological interactions and physiological properties. Bacterial wilt in capsicum caused by Ralstonia solanacearum is a global problem. It is difficult to control the bacterial wilt caused by Ralstonia solanacearum as it survives for longer period in soil, moves along with water, and has wide host range. Hence, in the present research study, the effect of different plant oils were evaluated against the pathogen in vitro by inhibition zone technique to find out the effective plant oil for use in management strategy of the disease. The experimental results revealed that, among the plant oils tested at 100% concentration, clove oil (Syzygium aromaticum) gives the best inhibitory effect to Ralstonia solanacearum with 33.99mm inhibition followed by karanj oil (Pongamia pinnata) with 15.66mm while the least inhibition is shown in case of sesamum oil (Sesamum indicum) with only 8.44mm inhibition zone against the test pathogen.

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