[目的]为了有效控制小菜蛾的危害,研发新型、高效植物源杀虫剂,[方法]用95％乙醇为溶剂对番茄茎、叶分别进行索氏提取,并以叶片浸渍法就提取物对小菜蛾幼虫的取食进行测定.[结果]结果表明,番茄茎、叶提取物对小菜蛾幼虫均有明显的拒食作用,且随着提取物浓度的升高,拒食率增加.在茎、叶提取物浓度均为100 g· L-1下,处理24 h后小菜蛾幼虫拒食率为70.70％和63.54％.[结论]番茄茎叶提取物可用于小菜蛾的防治中.%[Objective]In order to control the damage of Plutella xylostella effectively,the new style and high active plant insecticide was researched.[Methods]The soxlet's extraction method was used to extract the active material in tomato stems and leaves by using 95 ％ ethanol,and leaf immersion method was used to test the feeding of diamondback larvae.[Results]indicated that the extracts had obviously antifeedant rate to the larvae of diamondback moth.The higher concentration,the more obviously the effect on the pest was.The antifeedant rate reached 70.70％ and 63.54％ treated by contacting at concentration of 100 g·L-1 at 24 h.[Conclusion]The ethanol extract of tomato stems and leaves can be used in the control of diamonclback moth.
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