title: Analysis of the essential oil of Dipsacus japonicus flowering aerial parts and its insecticidal activity against Sitophilus zeamais and Tribolium castaneum.
abstract: Water-distilled essential oil from the aerial parts of Dipsacus japonicus Miq. (Dipsacaceae) at the flowering stage was analysed by gas chromatography-mass spectrometry (GC-MS). Forty-six compounds, accounting for 96.76% of the total oil, were identified and the main compounds of the essential oil were linalool (11.78%), trans-geraniol (8.58%), 1,8-cineole (7.91%), beta-caryophyllene (5.58%), alpha-terpineol (5.32%), beta-selinene (5.15%), and spathulenol (5.04%). The essential oil of D. japonicus possessed contact toxicity against two grain storage insects, Sitophilus zeamais and Tribolium castaneum adults, with LD50 values of 18.32 microg/ adult and 13.45 microg/adult, respectively. The essential oil of D. japonicus also exhibited pronounced fumigant toxicity against S. zeamais (LC50 = 10.11 mg/l air) and T. castaneum adults (LC50 = 5.26 mg/l air). Of the three major compounds, 1,8-cineole exhibited stronger fumigant toxicity than the crude essential oil against S. zeamais and T. castaneum adults with LC50 values of 2.96 mg/l air and 4.86 mg/l air, respectively.
authors: Department of Entomology, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, China. zhilongliu@cau.edu.cn
authors: Zhi Long
authors: ZL
authors: Liu
authors: Guo Hua
authors: GH
authors: Jiang
authors: Ligang
authors: L
authors: Zhou
authors: Qi Zhi
authors: QZ
authors: Liu
mesh_terms: D000818:Animals; D001517:Coleoptera; D049917:Dipsacaceae / Q000737:chemistry*; D035264:Flowers; D008401:Gas Chromatography-Mass Spectrometry; D007306:Insecticides; D009822:Oils, Volatile / Q000032:analysis*; D014231:Tribolium
chemical_list: D007306:Insecticides; D009822:Oils, Volatile