4.

Composition and T oxicity of E ssential O il of Illicium simonsii Maxim (Illiciaceae) Fruit against the Maize Weevils

Sha Sha Chu, Shao Liang Liu, Guo Hua Jiang and Zhi Long Liu

Department of Entomology , China Agricultural University, 2 Yuanmingyuan West Road, H aidian District , Beijing 100094 , PRChina

Department of Biology, Faculty of Preclinical Medicine, GuangXi Traditional Chinese Medical University, Nanning 530001, PRChina

Analytic and Testing Center, Beijing Normal University, No. 19, Xinjiekouwai Street, Beijing 100875, PRChina

Abstract: The e ssential oil of Illicium simonsii f ruit w as obtained by hydrodistillation and analyzed by gas chromatography-mass spectrometry (GC-MS). A total of 40 components of the essential oil were identified. The principal compounds in I. simonsii fruit essential oil were β-caryophyllene (10.30%), δ-cadinene (9.52%), methyl eugenol ( 8 .94), β-elemene (5.84%), and α-amorphene (5.20%). The essential oil possess ed strong fumigant toxicity against S itophilus zeamais adults with a LC 50 value of 14.95 mg/ L air. The essential oil also show ed contact toxicity against S. zeamais adults with a LD 50 value of 112.74 µg/adult.

Keywords: Illicium simonsii ; S itophilus zeamais ; essential oil; fumigant; contact toxicity; caryophyllene