Abstract
The rice weevil, Sitophilus oryzae is a major stored grain insect pest that causes both quantitative and qualitative damage to cereals. Hence, the study was conducted to evaluate the insecticidal efficacy of Clerodendrum multiflorum, Clerodendrum viscosum, Vitex negundo, Argemone mexicana and Withania somnifera leaves essential oil against S. oryzae in laboratory conditions. The essential oil isolated from V. negundo and A. mexicana at 2.0 μL/gm of wheat was found to be toxic, causing 100% mortality as compared to other plant essential oils. The percentage of oviposition deterrence increased from 20% to 90% by increasing the concentrations of essential oils. Interestingly, all plant essential oils were inhibited F1 adult emergence at lower dose. Essential oils of V. negundo and A. mexicana revealed significant toxicity, oviposition deterrence and inhibition of F1 adult emergence of S. oryzae at lower concentrations. Thus, these plant essential oils may be suggested as admixtures in the integrated management of rice weevil during the storage of grains.
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