Contact Toxicity and Repellency of the Essential Oil of Dictamnus dasycarpus Roots from China against Two Stored‐Product Insects |
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| Authors: | Kai Yang Shan‐Shan Guo Zhu‐Feng Geng Shu‐Shan Du Cheng‐Fang Wang Zhi‐Wei Deng |
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| Institution: | 1. Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization, Beijing Normal University, No.?19 Xinjiekouwai Street, Beijing 100875, P.?R. China, (phone/fax: +86‐10‐62208022);2. Analytical and Testing Center, Beijing Normal University, No.?19 Xinjiekouwai Street, Beijing 100875, P.?R. China;3. Key Laboratory of Radiological Protection and Nuclear Emergency, Chinese Center for Disease Control and Prevention, Xicheng District, Beijing 100088, P.?R. China, (phone/fax: +86‐10‐62389938) |
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| Abstract: | During our screening program for new agrochemicals from traditional medicinal herbs, Dictamnus dasycarpus was found to possess contact toxicity and repellent activity against the cigarette beetle Lasioderma serricorne and the booklouse Liposcelis bostrychophila. The essential oil obtained by hydrodistillation of D. dasycarpus roots was characterized by GC‐FID and GC/MS analyses, and the main components identified were syn‐7‐hydroxy‐7‐anisylnorbornene ( 1 , 49.9%), 1,3,4,5,6,7‐hexahydro‐2H‐inden‐2‐one ( 2 , 11.6%), 5,6‐diethenyl‐1‐methylcyclohexene ( 3 , 7.4%), and 3,9‐dimethyltricyclo4.2.1.12,5]dec‐3‐en‐9‐ol ( 4 , 6.35%). The D. dasycarpus root oil exhibited strong contact toxicity against L. serricorne adults and L. bostrychophila, with LD50 values of 12.4 μg/adult and 27.2 μg/cm2, respectively. Moreover, the essential oil also showed strong repellency against both stored‐product insects tested. |
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| Keywords: | Dictamnus dasycarpus Essential oils Lasioderma serricorne Liposcelis bostrychophila Contact toxicity Repellency |
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