Universidade Regional Integrada do Alto Uruguai e das Missões-Campus de Erechim, Av. Sete de Setembro, 1621, 99700-000, Erechim, RS, Brazil.
J Sci Food Agric. 2011 Jan 30;91(2):273-7. doi: 10.1002/jsfa.4181.
The objective of this work was to evaluate the insecticidal and repellent effect of essential oils of Eucalyptus dunnii, E. saligna, E. benthamii, E. globulus and E. viminalis in the control of Sitophilus zeamais in maize grains.
The essential oils chemical composition showed that the E. benthamii presents the cis-ocimene (56.88%) as major compound. Results permitted us to verify that the evaluated species presented different insecticidal action under Sitophilus zeamais. About 100% of mortality was achieved with doses of 65, 100 and 400 microL for E. dunnii, E. saligna and E. benthamii, respectively. After regression analysis the LD(50) values were calculated and E. dunnii was shown to be the most efficient (25.03 microL), followed by E. saligna (37.93 microL) and E. benthamii (121.09 microL). Using the previously calculated LD(50) values, the repellency activity was calculated, allowing us to conclude that all species presented significant values in terms of this important parameter.
The essential oil of Eucalyptus sp. presented insecticidal and repellency against Sitophilus zeamais Motschulsky (Coleoptera, Curculionidae). Although from an economic point of view synthetic chemicals are still more frequently used as repellents, natural products (essential oils) have the potential to provide efficient and safer repellents for humans and the environment.
本研究旨在评估蓝桉、柳桉、赤桉、蓝按和细叶桉精油对玉米象控制的杀虫和驱避作用。
精油的化学成分表明，赤桉主要化合物为顺式-罗勒烯（56.88%）。结果表明，所评估的物种对玉米象具有不同的杀虫作用。用 E. dunnii、E. saligna 和 E. benthamii 的剂量为 65、100 和 400 μL 时，可达到 100%的死亡率。回归分析计算了 LD（50）值，表明 E. dunnii 是最有效的（25.03 μL），其次是 E. saligna（37.93 μL）和 E. benthamii（121.09 μL）。使用先前计算的 LD（50）值，计算了驱避活性，可得出所有物种在该重要参数方面均具有显著值的结论。
桉树精油对玉米象具有杀虫和驱避作用。虽然从经济角度来看，合成化学品仍然更频繁地被用作驱避剂，但天然产物（精油）有可能为人类和环境提供高效且安全的驱避剂。
