Turbinaria conoides (J. Agardh) Kutzing ,(Phaeophyceae) a marine seaweed, and Marsilea quadrifolia Linn. (Marsileaceae) an aquatic fern, were tested for activity against Tobacco necrotic virus (TNV) and bacteria (antimicrobial). Local lesion method was adopted and half leaf comparisons were made in cotyledonary leaves of Cyamopsis tetragonoloba Taub.(Linn.). Extracts of the experimental plants ...