title: Chemical composition and insecticidal properties of essential oils of Piper septuplinervium and P. subtomentosum (Piperaceae).
abstract: Essential oils of Piper subtomentosum (leaves and inflorescences) and Piper septuplinervium (aerial parts) were analyzed by GC-MS; sixty-three compounds were determined, representing 92.0%, 86.9 %, and 91.8 % of the total relative oil composition of the leaves, inflorescences, and aerial parts, respectively. The most abundant component in the aerial parts and inflorescence oils was α-pinene (27.3%, 21.0%, respectively), and δ-cadinene was the main component of the leaf oil. Insecticidal activity of the essential oils were determined on the Spodoptera frugiperda second instar larvae; the essential oil from the aerial parts of P. septuplinervium was the most active against insect pests (LC50= 9.4 μL/L of air). Statistical analysis by direct Pearson correlation showed that the insecticidal activity of the essential oils was primarily due to camphene and α- and β-pinene. The effect of the oils on the insect life cycle was also evaluated, and in some cases, a delay in growth and inhibition of the oviposition in the females were observed.
authors.forename: Mónica Constanza
authors.initials: MC
authors.lastname: Ávila Murilloa
authors.forename: Luis Enrique
authors.initials: LE
authors.lastname: Cuca Suareza
authors.forename: Jairo Alonso
authors.initials: JA
authors.lastname: Cerón Salamanca
mesh_terms: D000818:Animals; D000081008:Bicyclic Monoterpenes; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D007306:Insecticides / Q000737:chemistry* / Q000494:pharmacology*; D039821:Monoterpenes / Q000737:chemistry / Q000494:pharmacology; D009822:Oils, Volatile / Q000737:chemistry* / Q000494:pharmacology*; D010058:Oviposition / Q000187:drug effects; D031701:Piper / Q000737:chemistry*; D013729:Terpenes / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000081008:Bicyclic Monoterpenes; D007306:Insecticides; D039821:Monoterpenes; D009822:Oils, Volatile; D013729:Terpenes; C019286:camphene; C005451:alpha-pinene