阿维菌素B2a衍生物类皮雷菌素对草地贪夜蛾的室内毒力  

Indoor bioactivity of avennectin B2a derivate lepimectin analogue against Spodoptera frugiperda

作　　者：林海蔚 韩慧霖 罗茵 马千里 张志祥[1] LIN Hai-wei;HAN Hui-lin;LUO Yin;MAQian-li;ZHANG Zhi-xiang(College of Agriculture,South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]华南农业大学农学院,广州510642

出　　处：《南方农业学报》2020年第6期1287-1292,共6页Journal of Southern Agriculture

基　　金：广东省重点领域研发计划项目(2020B020224002)。

摘　　要：【目的】测定不同浓度的类皮雷菌素对草地贪夜蛾的生物活性,为草地贪夜蛾的绿色防控提供参考依据。【方法】于室内用不同浓度(0、0.25、0.50、1.00、2.00和4.00 mg/L)类皮雷菌素药液浸泡过的玉米叶片分别喂食10头草地贪夜蛾2龄幼虫,3次重复;于处理前和处理后24、48 h测量幼虫的体重、体长等指标,观察记录幼虫的死亡情况,研究类皮雷菌素对草地贪夜蛾2龄幼虫生长的影响。【结果】在室内条件下,用不同浓度的类皮雷菌素药液浸泡过的玉米叶片喂食草地贪夜蛾2龄幼虫24和48 h后,2龄幼虫的死亡率随药液浓度的增大而上升,其中4.00 mg/L类皮雷菌素药液处理24 h后草地贪夜蛾2龄幼虫的体长增长率为-1.06%、体长增长抑制率为120.88%、平均取食叶面积为4.67 mm^2、取食抑制率为39.13%,处理24和48 h后草地贪夜蛾2龄幼虫的体重增长抑制率分别为19.03%和56.07%。【结论】类皮雷菌素对草地贪夜蛾的体长、体重和取食量均有抑制作用,在草地贪夜蛾的防控中有广阔的应用前景。【Objective】To determine the bioactivity of lepimectin analogue in different concentrations against Spodoptera frugiperda,and provide reference for green control of S.frugiperda.【Method】Indoor bioactivity was measured by leaf dipping method,10 S.frugiperda larvae were feed corn leaves separately,the leaves were dipped in different concentrations of lepimectin analogue(0,0.25,0.50,1.00,2.00 and 4.00 mg/L),each group repeated three times.Then the indexes such as body weight and length of S.frugiperda were measured after the treatment for 24 and 48 h,and observed the mortality of larvae,thus researching the effect of lepimectin analogue on the 2nd instar larvae of S.frugiperda.【Result】The results showed that under the indoor condition,after feeding the corn leaves soaked by lepimectin analogue for 24 and 48 h,the mortality rates of S.frugiperda 2nd instar larvae increased with the concentrations of lepimectin analogue.After feeding the leaves impregnated with 4.00 mg/L lepimectin analogue solution for 24 h,the body length growth rate was-1.06%,the inhibition rate of body length was 120.88%and the average feeding leaf area was 4.67 mm2,calculating the inhibition rate of feeding was 39.13%.After treatment with 4.00 mg/L lepimectin analogue for 24 and 48 h,the inhibition rates of body weight growth of 2nd instar larvae were 19.03%and 56.07%,respectively.【Conclusion】Lepimectin analogue has certain effect on the body length,weight and food intake of S.frugiperda,thus it has application value in the prevention and control of S.frugiperda.

关 键 词：草地贪夜蛾 室内毒力 浸叶法 阿维菌素B2a衍生物 类皮雷菌素 

分 类 号：S433.4[农业科学—农业昆虫与害虫防治] Q968.1[农业科学—植物保护]