author(s)
N Ashokkumar, A Shanthi, M Sivakumar and K Rajamani

abstract
The methanol extracts from different plant parts of G. superba viz., rind, rhizomes, leaves flower and seeds were evaluated by in vitro against antibacterial activity of Ralstonia solanacearum. In different methanol extracts tested, seeds (1.93 mm) and rhizomes (1.93 mm) extract was found to possess the highest R. solanacearum growth inhibition at 100 per cent concentration when compared to the others followed by leaves (1.70 mm), flowers (1.66 mm) and rind (1.63 mm) methanol extract was also inhibit the R. solanacearum growth. At 25 per cent concentration seed extract was showed highest growth inhibition followed by leaves, rhizomes, Flowers and Rind Extracts derived from different plant parts of G.superba viz., rind, rhizomes, leaves, flowers and seeds inhibited the growth of bacterial wilt pathogen, R. solanacearum with highest inhibition using seed and rhizome extracts.