Crop Protection, vol. 20, issue 4 (2001) pp. 317-320
Toxicity of various essential oils and their volatile constituents towards the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae), was determined. The most potent toxicity was found in essential oil from eucalyptus (LD50 = 28.9 μl/l air). GC-MS analysis of essential oil from eucalyptus showed it to be rich in 1,8-cineole (81.1%), limonene (7.6%) and α-pinene (4.0%). Treatment of S. oryzae with each of these terpenes showed 1,8-cineole to be most active (LD50=23.5 μl/l air). In addition to 1,8-cineole, benzaldehyde (LD50 = 8.65 μl/l air) occurring in peach and almond kernels had a potent fumigant toxicity towards the rice weevils. Therefore, benzaldehyde and other natural volatiles could be a safer fumigant to control stored-grain insect pests than those currently used. © 2001 Elsevier Science Ltd.
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