Tripathi A K, Prajapati V, Verma N, Bahl J R, Bansal R P, Khanuja S P S, Kumar S
Central Institute of Medicinal and Aromatic Plants, Lucknow, India.
J Econ Entomol. 2002 Feb;95(1):183-9. doi: 10.1603/0022-0493-95.1.183.
Essential oil extracted from the leaves of turmeric, Curcuma longa L., was investigated for contact and fumigant toxicity and its effect on progeny production in three stored-product beetles, Rhyzopertha dominica F. (lesser grain borer), Sitophilus oryzae L. (rice weevil), and Tribolium castaneum Herbst (red flour beetle). Oviposition-deterrent and ovicidal actions of C. longa leaf oil were also evaluated against T. castaneum. The oil was insecticidal in both contact and fumigant toxicity assays. The adults of R. dominica were highly susceptible to contact action of C. longa leaf oil, with LD50 value of 36.71 microg/mg weight of insect, whereas in the fumigant assay, adults of S. oryzae were highly susceptible with LC50 value of 11.36 mg/liter air. Further, in T. castaneum, the C. longa oil reduced oviposition and egg hatching by 72 and 80%, respectively at the concentration of 5.2 mg/cm2. At the concentration of 40.5 mg/g food, the oil totally suppressed progeny production of all the three test insects. Nutritional indices indicate >81% antifeedant action of the oil against R. dominica, S. oryzae and T castaneum at the highest concentration tested.
对从姜黄（Curcuma longa L.）叶片中提取的精油进行了研究，考察其对三种仓储害虫的触杀和熏蒸毒性及其对后代繁殖的影响。这三种仓储害虫分别是谷蠹（Rhyzopertha dominica F.）、米象（Sitophilus oryzae L.）和赤拟谷盗（Tribolium castaneum Herbst）。还评估了姜黄叶油对赤拟谷盗的产卵驱避和杀卵作用。在触杀和熏蒸毒性试验中，该精油均具有杀虫活性。谷蠹成虫对姜黄叶油的触杀作用高度敏感，其半数致死剂量（LD50）值为每毫克虫重36.71微克；而在熏蒸试验中，米象成虫高度敏感，其半数致死浓度（LC50）值为每升空气11.36毫克。此外，在赤拟谷盗中，当浓度为5.2毫克/平方厘米时，姜黄叶油分别使产卵量和卵孵化率降低了72%和80%。当浓度为40.5毫克/克食物时，该精油完全抑制了所有三种受试昆虫的后代繁殖。营养指标表明，在测试的最高浓度下，该精油对谷蠹、米象和赤拟谷盗的拒食作用均超过81%。
