Abstract:

In order to further investigate the safety of a new insecticide broflanilide in maize, the control effect, duration, usage and dosage of the insecticide on Spodoptera frugiperda, so as to screen out different types of insecticides, and provide the basis for rational selection of insecticides in emergency prevention and control. Broflanilide 100 g/L SC was selected as the test agent, emamectin benzoate 5% ME and spinetoram 25% WG were selected as the control agents for controlling Spodoptera frugiperda. The results showed that from the control effect, feeding hazard index, yield statistics and drug use, broflanilide 100 g/L SC 225 mL/hm² and 300 mL/hm² were more effective than emamectin benzoate 5% ME, and the control effect reached more than 60% after 21 days of the first and second application of pesticide; 21 days after the second application of pesticide, the injurious index of maize feeding could be controlled below grade 3, and the efficacy period could be maintained for 14-21 days without affecting the yield, which increased by 57.31%-59.02% compared with the control. Compared with spinetoram 25% WG, it could achieve the purpose of pesticide reduction. Two times of application could reduce the use of active ingredients of pesticides by 30-45 g/hm². It is suggested to further expand the experimental demonstration and promotion in the actual production, and the pesticide dosage of broflanilide 10% SC of 225-300 mL/hm² should be applied at an interval of 14-21 days to control Spodoptera frugiperda of maize, as the preferred agent to be used alternately with emamectin benzoate and spinetoram.

Key words: broflanilide, new insecticides, Spodoptera frugiperda, field efficacy, reduction of pesticide