辣蓼草提取物对玉米蚜的触杀活性研究

The Contact Toxicity Activity of Polygonum hydropipe Extract on Rhopalosiphum maidis

[目的]研究不同条件下辣蓼草乙醇提取物对玉米蚜的触杀活性。[方法]采用单因素试验和正交试验,研究不同浓度、温度和时间下辣蓼草提取物对玉米蚜的死亡率和校正死亡率。[结果]在提取物浓度100 mg/m L、温度25℃、时间36 h时,辣蓼草提取物对玉米蚜的触杀活性最高。提取物浓度对辣蓼草触杀活性影响最大,其次为温度和处理时间。[结论]该研究为开发以辣蓼草为原料的植物性杀虫剂提供理论依据。

[Objective]To study on contact toxicity activity of Polygonum hydropipe ethanol extract on Rhopalosiphum maidis under different conditions.[Method]Using single factor and orthogonal test,the mortality rate and adjusted mortality rate of Polygonum hydropipe ethanol extract on Rhopalosiphum maidis under different concentration,temperature and time was studied.[Result]Under concentration of 100 mg/m L,temperature 25 ℃,time 36 h,the contact toxicity activity of Polygonum hydropipe ethanol extract was the highest.Extract concentration was the key factor influencing the contact toxicity activity,followed by temperature and time rate.[Conclusion]The study provides theoretical basis for development of vegetable insecticide with Polygonum hydropipe as raw material.