title: Evaluation of acute toxicity of essential oil of garlic (Allium sativum) and its selected major constituent compounds against overwintering Cacopsylla chinensis (Hemiptera: Psyllidae).
abstract: In our screening program for insecticidal activity of the essential oils/extracts derived from some Chinese medicinal herbs and spices, garlic (Allium sativum L.) essential oil was found to possess strong insecticidal activity against overwintering adults of Cacopsylla chinensis Yang et Li (Hemiptera: Psyllidae). The commercial essential oil of A. sativum was analyzed by gas chromatography-mass spectrometry. Sixteen compounds, accounting for 97.44% of the total oil, were identified, and the main components of the essential oil of A. sativum were diallyl trisulfide (50.43%), diallyl disulfide (25.30%), diallyl sulfide (6.25%), diallyl tetrasulfide (4.03%), 1,2-dithiolane (3.12%), allyl methyl disulfide (3.07%), 1,3-dithiane (2.12%), and allyl methyl trisulfide (2.08%). The essential oil of A. sativum possessed contact toxicity against overwintering C. chinensis, with an LC50 value of 1.42 microg per adult. The two main constituent compounds, diallyl trisulfide and diallyl disulfide, exhibited strong acute toxicity against the overwintering C. chinensis, with LC50 values of 0.64 and 11.04 /g per adult, respectively.
authors.affiliation: Department of Entomology, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, China.
authors.forename: Na Na
authors.initials: NN
authors.lastname: Zhao
authors.forename: Hang
authors.initials: H
authors.lastname: Zhang
authors.forename: Xue Chang
authors.initials: XC
authors.lastname: Zhang
authors.forename: Xiao Bing
authors.initials: XB
authors.lastname: Luan
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhou
authors.forename: Qi Zhi
authors.initials: QZ
authors.lastname: Liu
authors.forename: Wang Peng
authors.initials: WP
authors.lastname: Shi
authors.forename: Zhi Long
authors.initials: ZL
authors.lastname: Liu
mesh_terms: D000490:Allium / Q000737:chemistry*; D000498:Allyl Compounds / Q000494:pharmacology*; D000818:Animals; D004305:Dose-Response Relationship, Drug; D008401:Gas Chromatography-Mass Spectrometry; D006430:Hemiptera / Q000187:drug effects*; D007306:Insecticides / Q000494:pharmacology*; D007928:Lethal Dose 50; D009822:Oils, Volatile / Q000494:pharmacology*; D013440:Sulfides / Q000494:pharmacology*
chemical_list: D000498:Allyl Compounds; D007306:Insecticides; D009822:Oils, Volatile; D013440:Sulfides; C038491:allyl sulfide