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Extracts of certain plant materials viz, Azadirachta indica, A/oe vera, Jatropha curcas, Calotropis procera, Annona squamosa and Vitex negundo were tested for their antifeedant property against the third instar larvae of teak skeletonizer, Eutectona machaeralis Walk. in laboratory. The result showed O. 5% methanol extract obtained from the leaves of Aloe vera to be the most effective and potent antifeedant. The average leaf area consumed in treated leaves by the larvae was found to be 3.84 per cent as compared to 62.99 percent in control. Extracts from Annona squamosa, Jatropha curcas, seeds of Azadirachta indica and commercially avail-able neem product were found to be the next.