Ovicidal activity of Sesamum indicum (L.) oil against Spodoptera littoralis (Boisd.) |
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Authors: | Mohamad Ahmad Khedr |
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Institution: | Cotton Leafworm Research, Agricultural Research Center, Plant Protection Research Institute, Giza, Egypt |
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Abstract: | In the research for alternative tools and botanical products to control Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae). Sesamum indicum (L.) (Lamiales: Pedaliaceae) oil was assayed as an ovicide. The mortality increased with existence of fatty acids. Chemical analysis of S. indicum oil using GLC analysis showed palmitic acid as the major fatty acid (51.27%), while the major hydrocarbon and sterols were found to be heneicosane (58.63%) and β-sitosterol (2.60%), respectively. Generally, the values of LC50s indicated that one-day-old egg masses are more susceptible than three-day-old eggs. Also, the leaf dip technique is more efficient than the spraying one. Results showed several features of chorionic surface deformation treated with sesame and KZ oils than control using scanning electron microscopy. Meanwhile, the tested oils caused significant reduction in both total soluble protein and transaminase enzymes as compared to control. Additionally, the oils elongated the incubation period and larval duration than control. |
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Keywords: | Spodoptera littoralis Sesamum indicum oils ultrastructure biochemical ovicidal |
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