Abstract
Nuclear polyhedrosis virus (NPV) is the most harmful virus responsible for the manifestation of grasserie disease in the larvae of silkworm, Bombyx mori. It causes a huge economic loss in the sericulture industry. An attempt was made in the present investigation for the screening of antiviral activity using medicinal plants such as Lantana camara, Phyllanthus amarus and marine seaweeds such as Sargassum wightii, Turbinaria ornata against BmNPV. Crude extracts were prepared using different solvents, such as hexane, ethyl acetate, methanol and water. The silkworm feeding bioassay study was carried out with the crude extracts to investigate the presence of anti-BmNPV activity after inoculating fifth instar larvae of silkworm with occlusion bodies (OBs) of BmNPV. Each extract was tested for their anti-BmNPV activity using various concentrations of crude extracts ranging from 200 μg to 1000 μg. Among the crude extracts tested, methanol and aqueous extracts of P. amarus showed significant anti-BmNPV activity.
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