Abstract
The antifeedant activity of the metabolites of Aristolochia albida root extracts was examined against tobacco cutworm larvae (Spodoptera litura, Noctuidae) using a leaf-disk choice bioassay. The antifeedant activities of the crude methanolic extract and aristolochic acid were very strong. 6-Hydroxyaristolochic acid showed moderate activity, while aristolic acid, aristolactam, and aristolone did not demonstrate any antifeedant activity at a 0.1% concentration. Methyl aristolochiate and methyl 6-hydroxyaristolochiate prepared by diazomethane treatment of the acids showed significantly lower activities when compared with the parent acids (.)
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