ABSTRACT: The experiment was conducted in the laboratory of the Department of Entomology, Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during June to October, 2019. The effectiveness of four botanical oils of black cumin (Nigella sativa), sesame (Sesamum indicum), castor (Ricinus communis) and neem (Azadirachta indica) were assayed for toxic and repellent effects against the third instar grub of Epilachna duodecastigma (Wied.) on bitter gourd. The result revealed that all the tested oils had promising insecticidal effect against the grub. However, among the treatments, castor oil performed the highest toxicity of LD50 value as 6.4mg/ ml against the larva after 72 hours exposure. Similarly, castor oil at 10% showed the highest (78.3%) repellency while sesame oil at 2.5% provided the lowest (45.5%) against the grub of epilachna beetle. Based on efficacy, castor oil might be used in integration with other IPM components against the 3rd instar grub of epilachna beetle.
Keywords: Botanical oils, Epilachna duodecastigma, repellency, toxicity
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