Antifeedant and growth inhibitory effects of some neo-clerodane diterpenoids isolated from Clerodendron species (Verbenaceae) on Earias vitella and Spodoptera litura |
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Authors: | Krishna Kumari G N Balachandran J Aravind S Ganesh M R |
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Institution: | T. R. Govindachari Centre for Natural Products, SPIC Science Foundation, 88 Mount Road, Chennai 600 032, India. gnkrishna@hotmail.com |
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Abstract: | Antifeedant and growth inhibitory effects of various neo-clerodane diterpenoids having a furofuran moiety, isolated from Clerodendron spp., were studied using Earias vitella and Spodoptera litura. The compounds clerodendrin B, 3-epicaryoptin, 15-hydroxyepicaryoptin, and clerodin were effective antifeedants at 10 microg/cm(3) (30 microg/g) of diet against E. vitella and at 10 microg/cm(2) of leaf against S. litura. All of the tested compounds, namely, clerodendrin B, 3-epicaryoptin, clerodendrin C, 15-hydroxyepicaryoptin, clerodendrin B acetate, and clerodin, showed good insect growth inhibitory activity even at lower concentrations. |
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