Khayasin and 2 ' S-methylbutanoylproceranolide: Promising candidate insecticides for the control of the coconut leaf beetle, Brontispa longissima

文献类型： 外文期刊

第一作者： Li, Min-Yi

作者： Li, Min-Yi;Wu, Jun;Zhang, Jing;Feng, Gang;Li, Min-Yi;Satyanandamurty, Tirumani

作者机构：

关键词： mexicanolide;khayasin;2'S-methylbutanoylproceranolide;Xylocarpus moluccensis;insecticidal activity;Brontispa longissima

期刊名称：JOURNAL OF PESTICIDE SCIENCE （ 影响因子：1.519； 五年影响因子：1.596 ）

ISSN： 1348-589X

年卷期： 2011 年 36 卷 1 期

页码：

收录情况： SCI

摘要： Brontispa longissima (Gestro) is a serious pest of coconut palms in tropical areas. In our continuing search for potential pesticides from tropical mangrove plants, khayasin (1) and 2'S-methylbutanoylproceranolide (2), two mexicanolides with a Delta(8,14) double bond, were isolated from seeds of an Indian mangrove, Xylocarpus moluccensis. The structures of these compounds were established by comparison with data in the literature. Compound I was found to exhibit potent insecticidal activities against second- to fifth-instar larvae of B. longissima at a concentration of 50 mu g/ml, and compound 2 displayed marked insecticidal activity against fifth-instar larvae of the same pest at the same concentration. LC(50) (concentration of 50% mortality) values for compound I against fifth-instar larvae of B. longissima at exposure times of 24 and 48 h are 7.27 and 3.39 mu g/ml, respectively, and those for compound 2 are 10.57 and 4.03 mu g/mL, respectively. The insecticidal activities of compounds 1 and 2 against fifth-instar larvae of B. longissima are more potent than those of azadirachtin and toosendanin, and are similar to those of rotenone; however, compounds 1 and 2 only exhibited moderate antifeedant activities against third-instar larvae of Prodenia litura (Fabricius). These results suggested that compounds 1 and 2 had selectively insecticidal activities against the larvae of B. longissima. They are promising candidate insecticides for the control of B. longissima. (C) Pesticide Science Society of Japan

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