Abstract

Synthetic insecticides, a traditional tool to avoid the reduction of stored-product due to insects, have emerged a serious of hazards to the environment for years, therefore, botanicals have entered people’s vision. This work aimed to present the essential oil composition of Melaleuca bracteata, and the contact as well as repellent activities against three stored-product insects, i.e. Lasioderma serricorne (Coleoptera: Ptinidae), Tribolium castaneum (Coleoptera: Tenebrionidae), and Sitophilus oryzae (Coleoptera: Curculionidae). For determining the composition, the analysis was performed by GC/FID and GC/MS. Among 11 identified compounds, the principal compounds were methyl eugenol (88.52 %) and methyl cinnamate (7.90 %). The essential oil demonstrated contact toxicity against L. serricorne, T. castaneum, and S. oryzae which LD₅₀ values were 3.2, 22.6, and 20.4 μg/adult, respectively. Methyl cinnamate was more effective than methyl eugenol. The repellent activity indicated that essential oil and major compositions of M. bracteata were effective against L. serricorne and T. castaneum, but no use for S. oryzae. In the contact assay, L. serricorne showed more sensitivity, however, in repellency assay, T. castaneum was susceptible. We seek to provide a new application of the popular ornamental plant, M. bracteata, and offer an alternative material to botanical insecticides development.

摘要

合成杀虫剂是避免由昆虫引起的储藏物减少的传统工具，多年来已经对环境造成了严重危害，因此植物药进入了人们的视野。这项工作旨在介绍白千层的精油成分，以及对三种贮藏昆虫的接触和驱避活性，这三种昆虫分别是：Lasioderma serricorne（鞘翅目：Ptinidae），Tribolium castaneum（鞘翅目：Tenebrionidae）和Sitophilus oryzae。（鞘翅目：Curculionidae）。为了确定组成，通过GC / FID和GC / MS进行分析。在鉴定出的11种化合物中，主要化合物为丁香酚丁香酚（88.52％）和肉桂酸甲酯（7.90％）。对精油证实接触毒性L.烟草甲，赤拟谷盗，和米象，其LD _50个值分别为3.2，22.6，和20.4微克/成人，分别。肉桂酸甲酯比甲基丁香酚更有效。的驱避活性表明，精油和的主要组合物M.苞反对有效L.烟草甲和赤拟谷盗，但没有使用米象。在接触试验中，serricorne乳杆菌显示出更高的敏感性，但是在排斥试验中，栗木锥虫易感。我们寻求提供一种流行的观赏植物M. bracteata的新应用，并为植物杀虫剂的开发提供替代材料。