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The Potential of Orange (Citrus sinensis L.) Peel Oil as a Fumigant and Repellent to Control Maize Weevil (Sitophillus zeamais Motsch)

Abstract This study was conducted to determine the insecticidal activity of essential oil from orange peel Citrus sinensis L. against maize weevil. The essential oil of fresh orange peel was obtained by hydrodistillation using a clevenger type apparatus. The study was conducted under laboratory condition. Different doses of essential oil of Citrus sinesis were tested. The experiments were arranged in a completely randomized design. Essential oil at the highest rate of 750 mg applied at 3 ml per filter paper gave 100 % mortality after 24 hours. In fumigation toxicity bioassay, 0.3 g of essential oil applied at the rate of 3 ml caused 61 % mortality within 24 hours. The treatment, however, showed lower repellency effect against maize weevil S. zeamais with 36 % repellency. The present study indicates that the orange oil has potential insecticidal characteristics, so it can be used as natural insecticides for storage pests.