9种生物农药对烟田斜纹夜蛾的防治效果研究

Control Efficacy of Nine Biotic Pesticides Against Spodoptera litura in Tobacco Field

【目的】探明不同生物农药对烟田斜纹夜蛾的防治效果,为选择安全高效的生物农药防治斜纹夜蛾提供信息。【方法】采用室内浸液法和田间喷雾法,测定了核型多角体病毒、藜芦碱杀螨剂、烟碱·苦参碱杀虫剂、甲维·虫螨腈杀虫剂、阿维菌素杀虫剂、印楝素杀虫剂、苦参碱杀虫剂、鱼藤酮杀虫剂和苏云金杆菌·甲维盐对江西烟区斜纹夜蛾的室内毒力和田间防效。【结果】9种生物农药室内处理斜纹夜蛾4龄幼虫10d后,校正死亡率均超过85%,其中核型多角体病毒、藜芦碱杀螨剂、甲维·虫螨腈杀虫剂、阿维菌素杀虫剂、印楝素杀虫剂和苏云金杆菌·甲维盐,校正死亡率超过90%。9种生物农药对烟田斜纹夜蛾均有良好防效,施药15 d后,甲维·虫螨腈杀虫剂、阿维菌素杀虫剂、印楝素杀虫剂和苏云金杆菌·甲维盐对斜纹夜蛾的防治效果较高,校正防效分别达到70.85%,71.84%,75.78%和73.81%。大田生育期施用不同生物农药,烟草芽、叶和茎均生长正常,未出现可见的药害症状。【结论】供试的9种生物农药均可用于防治烟田斜纹夜蛾,但甲维·虫螨腈杀虫剂、阿维菌素杀虫剂、印楝素杀虫剂和苏云金杆菌·甲维盐的田间防治效果好。

[Objective] This study was conducted to clarify the control efficacy of nine biotic pesticides against Spodoptera litura,so as to provide information for selecting safe and efficient biotic pesticides to control this pest.[Method] The indoor toxicity and field control efficacy of Nuclear Polyhedrosis Virus,Veratridine Acaricide,Nicotine Matrine Insecticide,Methionitrile Insecticide,Avermectin Insecticide,Azadirachtin Insecticide,Matrine Insecticide,Rotenone Insecticide and Bacillus Thuringiensis Methionine against Spodoptera litura were determined by indoor immersion and field spray methods in tobacco areas in Jiangxi.[Result] The indoor testing showed that,after adopting the above nine biotic pesticides,the corrected mortality rate of Spodoptera litura exceeded 85% on the 10th day,and the rate exceeded 90% on the 10th day after the treatment of Nuclear Polyhedrosis Virus,Veratridine Acaricide,Methionitrile,Avermectin,Azadirachtin and Bacillus Thuringiensis Methionine.Nine biotic pesticides could all control Spodoptera litura effectively.The corrected control efficacy of Methoxyfenitrile,Avermectin,Azadirachtin and Bacillus Thuringiensis against Spodoptera litura reached 70.85%,71.84%,75.78% and 73.81%,respectively,on the 15th day after spraying in tobacco field.No visible symptoms of pesticide damage occurred on the buds,leaves and stems of tobacco when these biotic pesticides were sprayed during the growth period of tobacco.[Conclusion] The nine biotic pesticides tested are all effective when fighting against Spodoptera litura.Comparitively,Methotrexate,Avermectin,Azadirachtin and Bacillus Thuringiensis have much higher efficiency in field control.