Chemical composition and insecticidal activity of the essential oil of Schinus molle L. on Tenebrio molitor L., 1785 (Coleoptera: Tenebrionidae).
Phytochemical study of the plants is promising in the discovery of compounds with potential for drug and agricultural sectors for the purposes of insecticides, fungicides and bactericides. The "aroeira-salsa" (Schinus molle) L. is a tree used in afforestation and urban landscaping its essential oil presents important activities. The objective of this study was to identify and quantify the chemical constituents of the essential oil of S. molle L. and assess its insecticidal activity on Tenebrio molitor L., a important pest in stored grain. The extraction of oil was carried out by hydrodistillation method using the apparatus Cleventer modified. To quantify the compounds present in the essential oil the gas chromatography was used with flame ionization detector (FID). The identification was accomplished by using a gas chromatography coupled with mass spectroscopy. The mircene was the major compound (69.57%). The essential oil of S. molle showed insecticidal activity by fumigation with LC50 of 4.63 (after 24 h) and 3.89 µg mL-1 (after 48 h) and repellency for concentration above the 1.84 µg mL-1. The essential oil of S. molle showed insecticidal activity, both for mortality as well as for repellency, against the T. molitor.