6种植物源农药对竹斑蛾幼虫的毒力及应用分析

为筛选有效控制竹斑蛾（Artona funeralis）幼虫的植物源农药，选用6种植物源农药开展室内毒力测定和林间防治效果分析。结果表明：6种植物源农药对竹斑蛾幼虫均有良好的致死作用。参试的植物源农药以1.2%烟碱·苦参碱乳油和1.5%苦参碱可溶液的毒力较强，0.4%蛇床子素乳油的毒力较弱；4%鱼藤酮乳油、1.2%烟碱·苦参碱乳油、0.4%蛇床子素乳油、1%苦皮藤素可溶液、碧绿1%苦参碱和1.5%苦参碱可溶液对竹斑蛾幼虫的LC₅₀分别为0.826 mg/L、0.596 mg/L、1.016 mg/L、0.962 mg/L、0.811 mg/L和0.612 mg/L；林间施药4 d后，6种植物源农药的防治效果均超过90%；最佳田间施药浓度为：1.5%苦参碱可溶液和1.2%烟碱·苦参碱乳油均为1 500倍液，碧绿1%苦参碱和4%鱼藤酮乳油均为1 200倍液，0.4%蛇床子素乳油和1%苦皮藤素可溶液均为1 000倍液。参试的植物源农药对竹斑蛾幼虫的防治效果良好，可用于生产上防治竹斑蛾幼虫。

Toxicity and Application Analyses of Six Plant-derived Pesticides on Larvae of Artona funeralis

In order to screen pesticides for effective control of Artona funeralis larvae, six plant-derived pesticides are selected for indoor toxicity determination and control effect analysis in bamboo forest. The results show that all the six plant-derived pesticides have a good lethal effect on the larvae of A. ferreta. The phytotoxicity of plant-derived pesticides with 1.2% nicotine-matrine and 1.5% matrine solution is stronger, and that of 0.4% osthole emulsifiable concentrate is weaker.The emulsion of 1.2% nicotine and matrine and the solution of 1.5% matrine have a stronger toxicity, and the emulsion of 0.4% basilin has a weaker toxicity among the tested pesticides. The LC₅₀ of 4% rotenone cream, 1.2% nicotine-matrine solution, 0.4% basilin cream, 1% bitter capsin solution, blue green 1% matrine and 1.5% matrine solution for A. ferreta larvae are 0.826 mg/L, 0.596 mg/L, 1.016 mg/L, 0.962 mg/L, 0.811 mg/L and 0.612 mg/L, respectively.; After four days of the pesticide application in forest, the control effects of six plant-derived pesticides are more than 90%. The best field concentration of pesticides are 1.5% matrine solution and 1.2% nicotine and matrine emulsion diluted to 1500 times, blue green 1% matrine and 4% rotenone emulsifiable oil diluted to 1200 times, 0.4% serpentin emulsifiable oil and 1% bitter rattan solution diluted to 1000 times. All the tested plant-derived pesticides have a good control effect on the larvae of A. ferreta, which can be used for the control of the larvae in forest.