84BIO-EFFICACY OF SOME MEDICINAL PLANT EXTRACTS AGAINST PSEUDOMONAS SYRINGAE PV. PISI CAUSING BACTERIAL BLIGHT OF PEABio-efficacy of six different medicinal plant extracts namely Withania somnifera (leaves), Azadirachta indica (leaves), Emblica officinalis (fruits), Tremineli achebula (fruits), Allium sativum (bulbs) and Zinziber officinalis (rhizomes) was testedin vitro using filter paper disc assay and seed treatment method against Pseudomonas syringae pv. pisi causing bacterial blight of pea.. The fresh aqueous plant extracts at two concentrations (50% and 100% w/v) were tested. All six plant extracts were found significantly effective to control the pathogen. The maximum antibacterial activity was shown by aqueous extract of A.sativum (IA=455.98mm2) followed by T.chebula (IA=415.25mm2). Seed treatment with aqueous extract of A. sativum improved seed germination (94.6%) as compared to check (56.3%) and control the incidence of the pathogen in seeds (85.5%)ashwani14286@gmail.comResearch512015Antibacterial,Pseudomonas syringaepv. pisi,Seed treatment,Plant extractsAshwani Kumar Verma,Kailash AgrawalP.G. Dept. of Botany, Govt. R. R. College, Alwar (Rajasthan), India,Department of Botany, University of Rajasthan, Jaipur 302004, India.