防治草地贪夜蛾复配药剂的筛选及田间最佳配比OA北大核心CSTPCD

[Objective]The aims of this study were to screen the combined pesticides that can signifi-cantly enhance the insecticidal efficacy,and explore the optimal formulation which has good control effect on the Spodoptera frugiperda.[Method]The indoor bioactivities of chlorantraniliprole,emamec-tin benzoate,indoxacarb,chlorfenapyr and lufenuron,both as single agents and in combination,against 3rd instar larvae of Spodoptera frugiperda were assessed using the leaf dipping method,and field efficacy tests were carried out on those ratios with more pronounced efficacy of the combination.[Result]All five insecticides as single agents demonstrated high toxicity against 3rd instar larvae of Spodoptera frugiperda,with emamectin benzoate showing the most toxicity(LC50=0.0241 mg·L-1),followed by lufenuron(LC50=0.1092 mg·L-1),chlorraniliprole(LC50=0.9406 mg·L-1),chlor-fenapyr(LC50=1.0687 mg·L-1),and indoxacarb(LC50=9.4069 mg·L-1).The co-toxicity coef-ficients(CTC)for chlorantraniliprole with indoxacarb,emamectin benzoate,chlorfenapyr and lufenu-ron at the mass ratios of 1∶11,36∶1,1.5∶1,15∶1 were 204.22,162.62,492.60 and 182.77,re-spectively,indicating significant synergistic effects.The field efficacy tests showed that the four combi-nations were more effective than the single agents,with the combination of chlorantraniliprole and chlorfenapyr at a mass ratio of 1.5∶1 providing strong control effects at 1,3 and 7 d after treatment.[Conclusion]In agricultural production,chlorantraniliprole can be compounded with chlorfenapyr at a mass ratio of 1.5∶1 for the control of Spododoptera frugiperda.