Chemical composition and insecticidal activities of essential oils against diamondback moth,Plutella xylostella (L.) (Lepidoptera: Yponomeutidae) |
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| Authors: | S G Eswara Reddy Shudh Kirti Dolma Rajkesh Koundal |
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| Institution: | 1. Entomology Laboratory, Plant Health Management Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, Indiaereddy@ihbt.res.in;3. Entomology Laboratory, Plant Health Management Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India;4. Natural Product Chemistry and Process Development Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India |
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| Abstract: | Five Himalayan plants namely, Acorus calamus, Cedrus deodara, Aegle marmelos, Tagetes minuta and Murraya koenigii were used for the extraction of essential oils through hydrodistillation and the major volatile constituents as identified by GC and GC–MS techniques were β-asarone (91.1%), β-himachalene (45.8%), limonene (59.5%), Z-ocimene (37.9%) and α-pinene (54.2%), respectively. Essential oils were tested for their insecticidal properties against larvae of diamondback moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae). Results showed that A. calamus was most toxic (LC50?=?0.29 mg mL?1) to P. xylostella followed by C. deodara (LC50?=?1.08 mg mL?1) and M. koenigii (LC50?=?1.93 mg mL?1) via residual toxicity bioassay. Per cent feeding deterrence index and growth inhibition was significantly higher in A. calamus (42.20 and 68.55, respectively) followed by C. deodara (35.41 and 52.47). In repellent activity studies, C. deodara showed high repellence (64.76%) followed by A. calamus (55.05%). |
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| Keywords: | Essential oils chemical composition residual toxicity antifeedant repellence |
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