Chemical compositions and insecticidal efficacies of four aromatic essential oils on rice weevil Sitophilus oryzae L
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ORIGINAL RESEARCH ARTICLE
Chemical compositions and insecticidal efficacies of four aromatic essential oils on rice weevil Sitophilus oryzae L Mayanglambam Alina Devi 1 & Bunindro Nameirakpam 1 & Thiyam Bidyababy Devi 1 & Saini Mayanglambam 1 & Kabrambam Dasanta Singh 1 & Sonia Sougrakpam 1 & Shamurailatpam Shadia 1 & Marjit Tongbram 1 & Saikhom David Singh 1 & Dinabandhu Sahoo 1 & Yallappa Rajashekar 1 Received: 14 May 2019 / Accepted: 6 January 2020 # African Association of Insect Scientists 2020
Abstract Plant essential oils contained secondary metabolite chemicals showing toxicities on stored grain insects. The main aims of this study was to evaluate the insecticidal efficacies and chemical compositions of essential oil from C. flexuosus, C. winterianus, C. martini, and P. cablin against Sitophilus oryzae (L.). The GC-MS analysis results showed that, the essential oils of four aromatic plants are rich in citral, neral, geranyl acetate, geraniol, citronellal, geraniol, citronellol, photocitral B, azulene and αguaiene respectively. The essential oils of C. flexuosus with LC50 values are 44.5 and 26.1 μl/L air after 24 and 48 h exposure which was found to be most potent fumigant than C. winterianus followed by C. martini and P. cablin respectively. Further, in contact toxicity, C. martini oil being the most effective against adults of S. oryzae with LC50 values of 2.6 and 1.8 μl/cm2 after 24 and 48 h exposure respectively, whereas moderate toxicity was observed in S. oryzae from the essential oils of C. winterianus and P. cablin. These results suggested that the essential oils extracted from C. flexuosus, C. winterianus, C. martini, and P. cablin can be used as in the management of S. oryzae in order to decrease the harmful effects and risk of synthetic insecticides on human beings. Keywords Cymbopogon species . Pogostemon cablin . Essential oils . GC-MS . Insecticidal efficacy . Sitophilus oryzae
Introduction The most problem for the storage of grain is the possibility of pest infestation and it widely affects the global economy. The infestation caused by pest are mainly controlled by using chemical insecticides but prolong using of many conventional fumigants lead insects to develop resistant against these Key messages • Evaluated the insecticidal efficacy and chemical composition of essential oils from Cymbopogon flexuosus, Cymbopogon winterianus, Cymbopogon martini, and Pogostemon cablin • The essential oils of C. flexuosus and C. martini exhibited potent fumigant and contact toxicities against Sitophilus oryzae • The essential oils were found to be a potent bio-fumigant and contact toxicity to stored grain pests instead of synthetic fumigant and insecticides * Yallappa Rajashekar [email protected] 1
Insect Resources Laboratory, Animal Resources Programme, Institute of Bioresources and Sustainable Development, Department of Biotechnology, Govt. of India, Takyelpat, Imphal, Manipur 795001, India
synthetic pesticides which affects health as well as environment (Isman 2006; Pimentel et al. 2007). In view
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