title: Identification of insecticidal constituents of the essential oils of Dahlia pinnata Cav. against Sitophilus zeamais and Sitophilus oryzae.
abstract: The aim of this research was to determine the chemical composition of the essential oils of Dahlia pinnata, their insecticidal activity against Sitophilus zeamais and Sitophilusoryzae and to isolate insecticidal constituents. Based on bioactivity-guided fractionation, active constituents were isolated and identified as D-limonene, 4-terpineol and α-terpineol. Essential oils and active compounds tested exhibited contact toxicity, with LD50 values ranging from 132.48 to 828.79 μg/cm(2) against S. zeamais and S. oryzae. Essential oils possessed fumigant toxicity against S. zeamais and S. oryzae with LC50 from 14.10 to 73.46 mg/L. d-Limonene (LC50 = 4.55 and 7.92 mg/L) showed stronger fumigant toxicity against target insects. 4-Terpineol (88 ± 8%) and d-limonene (87 ± 5%) showed the strongest repellency against S. zeamais and S. oryzae, respectively. The results indicate that essential oils and insecticidal constituents have potential for development into natural fumigants, insecticides or repellents for control of the stored-product insect pests.
authors.affiliation: a College of Plant Science, Jilin University , Changchun , Jilin 130062 , P.R. China.
authors.forename: Da-Cheng
authors.initials: DC
authors.lastname: Wang
authors.forename: Da-Ren
authors.initials: DR
authors.lastname: Qiu
authors.forename: Li-Na
authors.initials: LN
authors.lastname: Shi
authors.forename: Hong-Yu
authors.initials: HY
authors.lastname: Pan
authors.forename: Ya-Wei
authors.initials: YW
authors.lastname: Li
authors.forename: Jin-Zhu
authors.initials: JZ
authors.lastname: Sun
authors.forename: Ying-Jie
authors.initials: YJ
authors.lastname: Xue
authors.forename: Dong-Sheng
authors.initials: DS
authors.lastname: Wei
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
authors.forename: Ya-Mei
authors.initials: YM
authors.lastname: Zhang
authors.forename: Jian-Chun
authors.initials: JC
authors.lastname: Qin
mesh_terms: D000818:Animals; D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes / Q000737:chemistry / Q000302:isolation & purification; D031944:Dahlia / Q000737:chemistry*; D007306:Insecticides / Q000737:chemistry*; D000077222:Limonene; D008610:Menthol / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification; D039821:Monoterpenes / Q000737:chemistry / Q000302:isolation & purification; D009822:Oils, Volatile / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D013729:Terpenes / Q000737:chemistry / Q000302:isolation & purification; D048889:Weevils
chemical_list: C534301:4-methyl-1-(1-methylethyl)-3-cyclohexen-1-ol; D000081005:Cyclohexane Monoterpenes; D053138:Cyclohexenes; D007306:Insecticides; D039821:Monoterpenes; D009822:Oils, Volatile; D010938:Plant Oils; D013729:Terpenes; D008610:Menthol; C016775:alpha-terpineol; D000077222:Limonene
keywords: chemical composition; contact toxicity; fumigant toxicity; insecticidal constituents; repellency