甲氨基阿维菌素苯甲酸盐与四唑虫酰胺复配对草地贪夜蛾的联合生物活性及田间防效

Combined toxicity and field control efficacy of emamectin benzoate mixed with tetraniliprole against Spodoptera frugiperda

[目的]为获得对草地贪夜蛾具有速效性及持效性的杀虫剂复配组合。[方法]选择甲氨基阿维菌素苯甲酸盐和四唑虫酰胺对草地贪夜蛾3龄幼虫进行生物活性测定,并利用共毒因子以及共毒系数法明确不同杀虫剂复配的生物活性,随后在田间条件下对具有增效作用的复配组合进行试验。[结果]甲氨基阿维菌素苯甲酸盐和四唑虫酰胺对草地贪夜蛾3龄幼虫72 h的LC_(50)分别为0.088、4.380 mg/L。利用共毒因子法筛选具有增效作用的组合为1∶50、1∶25;利用共毒系数法筛选具有增效作用的组合为1∶30、1∶40、1∶50、1∶60,LC_(50)分别为0.936、0.742、1.086、1.915 mg/L。田间试验结果表明:甲氨基阿维菌素苯甲酸盐和四唑虫酰胺1∶40进行复配,药后3、14 d均表现出良好防控效果。[结论]甲氨基阿维菌素苯甲酸盐和四唑虫酰胺复配对于草地贪夜蛾防控具有良好的速效性和持效性。

[Aims]In order to screen out the combinations of insecticides with rapid and persistent effect against Spodoptera frugiperda.[Methods]The toxicity of emamectin benzoate and tetraniliprole to 3~(rd)instar larvae of S.frugiperda was investigated,and the combined toxicity of emamectin benzoate and tetraniliprole was evaluated by co-toxicity factor and co-toxicity coefficient,meanwhile,field control effect of selected agent was also conducted.[Results]The result showed that the(72 h)LC_(50)values of emamectin benzoate and tetraniliprole against 3~(rd)instar larvae of S.frugiperda were 0.088 and 4.380 mg/L,respectively.The combinations of 1∶50 and 1∶25 with synergistic effect were screened by co-toxicity factor method.The combinations with synergistic effect were 1∶30,1∶40,1∶50 and 1∶60 by co-toxicity coefficient method,and their LC_(50)were 0.936,0.742,1.086 and 1.915 mg/L,respectively.The results of field trials showed that the mixture of emamectin benzoate and tetraniliprole at the ratio of 1∶40 had good control effect on S.frugiperda on day 3 and 14.[Conclusions]In summary,the combination of emamectin benzoate and tetraniliprole has good rapid and persistence effects on the control of S.frugiperda.