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Chemical Composition of Different Extracts of Conyza bonariensis: Insecticidal and Nematicidal Activities

American Journal of Analytical Chemistry 2023年第2期14卷 95-120页

作者： Kodjo Adande Kodjo Eloh Oudjaniyobi Simalou Marie-France Bakaï pierluigi caboni Laboratoire de chimie organique et des substances naturelles (Lab COSNat) Département de Chimie Faculté Des Sciences Université de Lomé Lomé Togo Laboratoire de chimie organique et des Sciences de l’Environnement (LaCOSE) Département de Chimie Faculté Des Sciences et Techniques Université de Kara Kara Togo Department of Life and Environmental Sciences University of Cagliari Cagliari Italy

C. bonariensis (L.) Cronq. known as hairy fleabane was first described in Argentina but it is now widely spread through most warmer regions of Europe, Africa, Asia, the Caribbean and Central America. In this work, a chemical analysis by liquid and gas chromatography coupled with mass spectrometry of the whole plant, aerial part, flowers and roots extracts of C. bonariensis harvested in Togo (West Africa) was carried out. Two acetylenic compounds Lachnophyllum ester and limonene were identified as the main components of essential oils while Lachnophyllum and Matricaria lactones were dominant in chloroform extracts. Based on the plant chemical compositions, essential oils and chloroform extracts were tested on cowpea weevil Callosobruchus maculatus adults which are considered as one of the most cosmopolitan pests of stored beans, and on freshly hatched second-stage juveniles of root-knot nematode Meloidogyne incognita. Results showed that the whole plant essential oil demonstrated an LC50/24h value of 1.75 μL oil/L air on C. maculatus while at 3.91 μL oil/L air, it showed 100% mortality. Furthermore, the plant root chloroform extracts partitioned in diethyl ether-hexane mixture showed the strongest nematicidal activity with an LC50/72h value of 0.47 mg/mL. Our findings suggest that the widely diffused plant C. bonariensis and its acetylenic constituents could be considered as potent botanical insecticidal and nematicidal agents.

关键词： Conyza bonariensis Insecticidal Activity Nematicidal Activity Callosobruchus maculatus Meloidogyne incognita

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