Ovicidal and larvicidal activity and possible mode of action of phenylpropanoids and ketone identified in Syzygium aromaticum bud against Bradysia procera

摘要: Bradysia procera is a serious insect pest of Panax ginseng plants. This study was conducted to determine the toxicity and mechanism action three phenylpropanoids, terpenoids, ketone from Syzygium aromaticum bud methanol extract hydrodistillate against third-instar larvae eggs B. procera. In filter-paper mortality bioassay, methyl salicylate (LC50, 5.26μg/cm2) most toxic compound, followed by 2-nonanone, eugenol, eugenyl acetate (8.77-15.40μg/cm2). These compounds were significantly less than either thiamethoxam, clothianidin, or cypermethrin. Egg hatching inhibited 97, 85, 40% at 11.7μg/cm2 salicylate, respectively. The egg-hatching inhibition these insecticides between 90 94% 0.09μg/cm2. constituents consistently more in closed versus open containers, indicating that achieved mainly through vapor. larvicidal might be primarily due interference with octopaminergic system. 2-Heptyl 2-nonanone act on both acetylcholinesterase receptor. 2-Heptanone acetylcholinesterase. Further studies will warrant possible applications S. bud-derived products as potential larvicides ovicides for control