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Abstract

Growing tips . nodal segments with rudimentary buds and sprout discs excised from PVX infected tubers and seedlings were grown in modified and enriched medium. Thiouracil and malachite green were used as antiviral chemicals in different concentrations. Thiouracil was found to be more effective and better than malachite green for antiviral properties. Chemicals either arrested virus multiplication or rendered it inactive. A combination of the antiviral chemicals incorporated in medium did not result in synergistic action as presumed. It was further observed that potato extreact did not support root initiation or development , as claimed by manzer (1958) and others

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