ABSTRACT With reference of more than 120 documents, the natural antifeedants discovered during past several years were reviewed according to their chemical structures. Their plant origins, effective ingredients, active density, antifeeding effects, tested insects and action mechanism were also summarized. Since the azadirachtin was found from plant Azadirachta indica in 1968[l], scientists began one new research field on new pesticides— antifeedants. Insect antifeedants have been found to be high specificity, easy degradation, harmless to man, animal and plants, and rarely toleranted by insects. In recent years, with the increase of insects of pesticide-resistance and the requests of green food and environment protection, the antifeedant, which can reduce the damages of crop pests while neither do harm to human boday nor leave pollution to circumstances, are attached to more and more importance. During the past ten years, extensive research on the extraction and purification of natural antifeedant ingredients has been done. Nearly two hundred active compounds with identified structures were isolated from plants species involving at least 40 genera of 26 families separately. The activities of these antifeedants were tested with more than 40 types insects which belong to 26 families of 9 orders. Bioassays revealed that the antifeeding activities of these antifeedants are closely related to thire structures. In this review, the natural antifeedants from plant species are classified according to thire structures.
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