10.22376/ijpbs.2019.10.1.p1-12 Volume 8 Issue 2 2017 (April - June) Evaluation of natural products as safe and effective antimicrobial agents is one of the scientific strategies to combat the menace of drug-resistance and pesticide pollution. Aqueous extract and different solvent extracts of seeds of lessThan i greaterThan Trachyspermum ammi, lessThan /i greaterThan leaves of lessThan i greaterThan Murraya koenigii lessThan /i greaterThan (Linn.) Spreng. lessThan i greaterThan , lessThan /i greaterThan peels of lessThan i greaterThan Cucumis sativus lessThan /i greaterThan Linn lessThan i greaterThan . lessThan /i greaterThan and lessThan i greaterThan Citrullus lanatus lessThan /i greaterThan Thunb. lessThan i greaterThan , lessThan /i greaterThan were screened lessThan i greaterThan in vitro lessThan /i greaterThan for antimicrobial activity against phytopathogenic microbes namely, lessThan i greaterThan Xanthomonas axonopodis lessThan /i greaterThan pv lessThan i greaterThan . vesicatoria lessThan /i greaterThan , lessThan i greaterThan Xanthomonas campestris lessThan /i greaterThan pv lessThan i greaterThan . campestris, Pseudomonas syringae, Aspergillus flavus lessThan /i greaterThan and lessThan i greaterThan Fusarium verticelloides lessThan /i greaterThan by agar cup diffusion method. Among the aqueous and different solvent extracts, methanol extract of lessThan i greaterThan M. koenigii lessThan /i greaterThan showed significant activity against all the tested bacteria and lessThan i greaterThan F. verticelloides lessThan /i greaterThan (zone of inhibition ranged from 8 to 53 mm).Methanol extracts of lessThan i greaterThan C. sativus lessThan /i greaterThan recorded an inhibition zone of 15 mm against lessThan i greaterThan X. a. lessThan /i greaterThan pv lessThan i greaterThan . vesicatoria lessThan /i greaterThan and13mm against lessThan i greaterThan X. c. lessThan /i greaterThan pv lessThan i greaterThan . campestris. lessThan /i greaterThan Chloroform, ethyl acetate and methanol extracts of lessThan i greaterThan T. ammi lessThan /i greaterThan recorded zone of inhibition ranging from 8 to 32mm against all the test bacteria and lessThan i greaterThan F. verticelloides. lessThan /i greaterThan The antimicrobial activity of these promising plant extracts when compared with standard drugs streptocycline, bacteromycin and bavistin revealed significant inhibitory potential. Preliminary phytochemical analysis of the active extracts revealed the presence of tannin in all the tested extracts. The positive results of the present evaluation provide primary platform for further pharmacological studies. PUTTASWAMY RAJESHWARI AND KOTESHWASR ANANDRAO RAVEESHA Antimicrobial activity, Murraya koenigii, Trachyspermum ammi and Tannins 65-70