Abstract
The insect antifeedant and phytotoxic effects of the essential oils (EO) from four populations of Piper species (Piper dilatatum, Piper divaricatum, Piper aff. hispidum and Piper sanctifelicis) have been studied against pests of economic importance in agriculture (Spodoptera littoralis, Myzus persicae, and Rhopalosiphum padi) and mono and dicotyledoneous plant models (Lolium perenne and Lactuca sativa). The main components found in the essential oils (EOs) were eugenol (37.5%), methyl eugenol (36.3%), γ-elemene (10.7%) (P. divaricatum); apiol (79.0%), trans-caryophyllene (8.3%) (P. dilatatum); δ-3-carene (35.3%), limonene (27.1%), p-cymene (4.9%), β-pinene (6.9%) and nerolidol (5.8%) (P. sanctifelicis); limonene (17.2%), δ-3-carene (9.6%), p-cymene (10.9%), elemol (14.1%), and Spathulenol (6.1%) (P. aff. hispidum). Strong antifeedant and phytotoxic effects were observed for all these oils. P. dilatatum EO was the most effective antifeedant. P. dilatatum and P. divaricatum EOs showed strong herbicidal potential on L. perenne and P. aff hispidum reduced the root growth of L. sativa.
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