Abstract
Abstract The plant defensive activities of the hexane and ethanolic extracts from Dittrichia viscosa and Ferula communis against generalist herbivorous insects ( Spodoptera littoralis and Myzus persicae ), are described here. Additionally we tested for their effects on nematodes ( Meloidogyne javanica ) and plants ( Lactuca sativa and Lolium perenne ). These plant extracts showed variable biological effects, their aphid antifeedant action being the most important. The bioassay-guided search for aphid antifeedant compounds resulted in the isolation of tomentosin ( 1 ), inuviscolide ( 2 ) and ferulenol ( 3 ). Tomentosin ( 1 ) rich extracts of D. viscosa were more active than ferulenol ( 3 ) rich extracts from F. communis.
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