In-vitro screening of indigenous botanicals of Manipur for anti fungal activities of Helminthosporium oryzae an incitant of brown spot disease of rice and efficacy test at different level of concentrations

Abstract

Eleven indigenous plant species of Manipur viz., Mariandra benghalensis, Millettia pachycarpa, Allium hookerii, Flogacanthus thyrsiflorus, Solanum incanum, Tithonia diversifolia, Goniothalamus sesquipedalis, Solanum surattense, Artemisia nilagarica, Ocimum canum and Zanthozylum acanthopodium which has been used as local medicine and spices were collected from five district of Manipur viz. Tamenglong, Senapati, Kangpokpi, Imphal east and Imphal West. In –vitro screening of above indigenous botanicals of Manipur was studied for anti-fungal activities of Helminthosporium oryzae an incitant of brown spot disease of Rice. The first five botanicals with maximum inhibition was found in Solanum incanum with 52.44% followed by Allium hookerii (47.77%), Millettia pachycarpa (36.66%), Mariandra benghalensis (24.44%) and Flogacanthus thyrsyflorus (17.77%) over control. Efficacy test at different level of concentrations i.e. 10%, 15% and 20% of standard botanical extracts was evaluated against growth of fungus both in broth and solid culture media. However, among botanicals maximum per cent inhibition on biomass production was found at 20% concentrate of S. incanum with growth inhibition of 74.03%, followed by A. hookerii (62.66%), M. Benghalensis (46.36%) and F. thyrsiflorus (42.33%) growth inhibition over the untreated control. In solid media test maximum per cent inhibition on radial growth of test fungi was found at 20% concentration in treatment of S. incanum with growth inhibition of 72.70% over control followed by A. hookerii (59.81%), M. Pachycarpa (45.03), M. benghalensis (37.59%) and F.thyrsiflorus (28.70%) over the untreated control.