Abstract

G. Biswal* and N. K. Dhal

ABSTRACT

Studies were conducted in the Department of Plant Pathology, Odisha University of Agriculture and Technology, Bhubaneswar following inhibition zone technique to test the bio-efficacy of seed extracts in vitro against Pectobacterium carotovorum causing pre-emergence and post–emergence rotting, black leg in field soft rot in storage in potato. The seeds used in the tests were Terminalia chhebula (Chhebulic myrobalan),T. belerica (Beleric myrobalan), Emblica officinalis (Indian goose berry), (Azadirachata indica (Neem), (Greater cardamom), Rauvolfia serpentina (Snake root), Coriandrum sativum (Dhania), Cuminum cyminum (Cumin), Nigella sativa (Black cumin), Foeniculum vulgare (Fennel), Piper nigrum (Black pepper), Cassia fistula (Indian laburn), Cassia tora (Senna tora). The results revealed that R.serpentina exhibited maximum size of inhibition zone 13.53 followed by A.subulatum(11.33) against the test bacterial species .The inhibition zone was found to be10.0mm in seed extracts of T.chebula while 9.30mm in F.vulgare 8.68 in C.cyminum and 8.03mm in N.sativa. There was no significant difference in antibacterial activity between A aromaticum (7.97) and A.indica(7.92). The antibacterial activity was same(7.01mm) in T.bellirica and C.viscosa. In P.nigrum, C.fistula and C.tora expressed same inhibiting activity (6.95mm). Minimum inhibition zone was observed in E.officinallis (6.68mm).