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Journal of Entomology
Year: 2018  |  Volume: 15  |  Issue: 1  |  Page No.: 36 - 46

Effects of Essential Oils on Growth, Feeding and Food Utilization of Spodoptera littoralis Larvae

Ahmed El-Sabrout, Hossam El-Din Zahran and Samir Abdelgaleil    

Abstract: Background and Objectives: The intensive use of synthetic insecticides has increased environmental pollution, development of resistance of many insects and harmful effects on non-target species. These undesirable effects encouraged the use of insecticide alternatives particularly plant products and essential oils. In the present study, the bioactivity of five essential oils isolated from Egyptian plants was examined against Sopdoptera littoralis. Methodology: The essential oils of Artemisia judaica, Citrus lemon, Origanum vulgare, Rosmarinus officinalis and Schinus molle were isolated by hydrodistillation and their chemical compositions were identified by gas chromatograph/mass spectrometer. The oils were evaluated for their anti-nutritional, antifeedant and growth inhibitory activities against Sopdoptera littoralis larvae. Results: The oil of C. lemon caused the highest reduction of relative growth rate (RGR) at all of the tested concentrations (125, 250, 500, 1000 and 2000 mg L–1). In addition, the tested oils significantly reduced efficiency of conversion of ingested food (ECI) and efficiency of conversion of digested food (ECD). On the other hand, the tested oils showed moderate antifeedant activity against the larvae. The tested oils showed remarkable growth inhibition of larvae with C. lemon being the most effective oil as the growth inhibition index value was 73.85% at 2000 mg L–1. Moreover, the tested essential oils induced reduction in larval chitin formation and caused undifferentiated ovarioles of emerged females. The essential oil of A. judaica revealed the highest insecticidal activity on 4th instar larvae with LC50 value of 492.3 mg L–1. Conclusion: These results indicate that the tested essential oils may be useful as alternative in management of S. littoralis.

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