辣蓼草提取物对玉米蚜的拒食活性

目的]探究不同条件下辣蓼草乙醇提取物对玉米蚜的拒食活性。方法]采用单因素试验和正交试验,研究不同浓度、温度和时间条件下辣蓼草提取物对玉米蚜的拒食率。结果]提取物浓度为100.00 mg/m L、温度为30℃、时间为48 h时辣蓼草提取物对玉米蚜的拒食活性最高。提取物浓度对辣蓼草拒食活性影响最大,其次为处理时间因素。结论]该试验结果为开发以辣蓼草为原料的植物性杀虫剂提供了理论依据。

Antifeedant Activity of Polygonumhy dropiper Extract on Corn Leaf Aphid

Objective]The aim was to study on antifeedant activity of Polygonum hydropiper ethanol extract on corn leaf aphid under different conditions.Method]Using single factor and orthogonal test,the antifeedant activity of Polygon um hydropiper ethanol extract on corn leaf aphid under different concentration, temperature and time was studied.Result]The results showed that under concentration of 100.00 mg/mL,tem-perature 30 ℃and time 48 h,the antifeedant activity of Polygonum hydropiper ethanol extract was the highest.Extract concentration was the key factor influencing the antifeedant activity,followed by time factor.Conclusion]The study provides theoretical basis for development of vegeta -ble insecticide with Polygonum hydropiper as raw material.