Preparation method of pigeon pea seed microemulsion, pigeon pea seed microemulsion and application of pigeon pea seed microemulsion

The invention provides a preparation method of a microemulsion for preventing and controlling spodoptera frugiperda. The preparation method comprises the following steps: S1, crushing seeds of longclaw beans to obtain powder of the seeds of the longclaw beans; s2, carrying out reflux extraction on the dragon claw bean seed powder by using an acetone solvent, separating leachate and solids generated by reflux extraction, filtering the leachate, carrying out rotary evaporation on the filtered leachate, and heating and evaporating the acetone solvent to obtain an extract; and S3, preparing the extract into a microemulsion. Compared with the traditional chemical pesticide, the microemulsion prepared by the invention has the advantages of low cost, low toxicity, small environmental pollution, difficulty in generating drug resistance of pests and the like, and can effectively prevent and control the spodoptera frugiperda. 本发明提供一种用于防治草地贪夜蛾的微乳剂的制备方法，包括以下步骤：S1，粉碎龙爪豆种子获得龙爪豆种子粉末；S2，用丙酮溶剂对龙爪豆种子粉末进行回流提取，分离回流提取产生的浸出液与固体，对浸