Sustainable management studies against Ralstonia solanacearum causing bacterial wilt in tomato

Abstract

In present investigation, The in vitro evaluation of different varieties against R. solanacearum showed that 4 tomato varieties (LS-89, Hawaii 7996, Hawaii 7998, Palam Pride), 2 brinjal varieties (Arka Keshav, Arka Nidhi) and 2 chilli varieties (PI201232, VI-037556) were found resistant to bacterial wilt. Among six bioagents, Pseudomonas fluorescens and Trichoderma koningii (DMA-8) showed maximum inhibition zones of 21.67mm and 12.33mm against R. solanacearum, respectively with paper disc method. In case of botanicals, eucalyptus (Eucalyptus spp.) showed highest inhibition zone (6.73mm) followed by neem (Azadirachta indica) with 6.56mm at 20% conc. Similarly, among the organic inputs tamar lassi at 5% concentration showed maximum growth inhibition (99.21%) followed by Himsol (93.01%) through poison food technique whereas, Agniastra, Beejamrit and Lantana Ark were found ineffective in inhibiting the growth of R. solanacearum. The maximum survivability of the seedlings was 12.01 days followed by 4.41 days when the seedlings were dipped in a combination of tamar Lassi + Himsol + Panchgavya and tamar lassi alone for 60 minutes at 15% concentration, respectively. As a result of these experiments, we conclude the existence of variability in Ralstonia solanacearum incidence in Himachal Pradesh. This finding would further the research in developing appropriate management strategies to contain the perpetuation ofbacterial wilt disease in plants.