Essential Oil Composition and Insecticidal Activity of Salvia umbratica Flowering Aerial Parts from China Against Sitophilus zeamais.

Water-distilled essential oil from Salvia umbratica Hance (Labiatae) flowering aerial parts was analyzed by gas chromatography-mass spectrometry (GC-MS). Forty-eight compounds, accounting for 96.77% of the oil, were identified and the main components of the essential oil of S. umbratica flowering aerial parts were 1,8-cineol (16.74%), β-caryophyllene (8.42%), a-thujone (7.80%), caryophyllene oxide (6.85%), camphor (6.65%), and alloaromadendrene (5.60%) followed by germacrene D (4.29%) and linalool (4.15%). The essential oil of S. umbratica possessed contact toxicity against Sitophilus zeamais adults with an LD50 value of 18.12 μg/adult. The oil also showed pronounced fumigant toxicity against S. zeamais with an LC50 value of 10.59 mg/L. [ABSTRACT FROM AUTHOR]