Abstract:

Since the invasion of Spodoptera frugiperda into China, its occurrence has become more and more extensive, and its harm has become more and more serious. Although there are a lot of reports on the control of Spodoptera frugiperda in China, there are few studies on the control of Spodoptera frugiperda by the combination of seed dressing agent and stem leaf spray. For this reason, in 2022, the author carried out the safety, field control effect and yield increase effect tests of four treatments on maize, namely, 50% chlormebenzamide seed dressing and 25% spinetoram stem and leaf spray, 50% chlormebenzamide seed dressing and 5.7% emamectin benzoate stem and leaf spray, 25% spinetoram stem and leaf spray, and 5.7% emamectin benzoate stem and leaf spray. The results showed that the combination of chloramphenicol seed dressing+spinetoram stem and leaf spray had significant effects on seedling protection, insect control and yield increase. The emergence rate of maize after chemical seed mixing treatment was significantly higher than that of the blank control, and the seed mixing agent had a promoting effect on the emergence of maize; In the case of a large number of Spodoptera frugiperda, seed dressing with 50% chloramphetamine can effectively control the damage of Spodoptera frugiperda to maize in the early growth stage, but in the middle and late growth stage of maize, it still needs to rely on efficient agents such as spinetoram for stem and leaf spray to control the damage of Spodoptera frugiperda. Each chemical treatment has a significant effect on the yield increase of maize, and its trend is that the combination of 50% chloramphenicol seed dressing and 25% spinetoram stem and leaf spray>the combination of 50% chloramphenicol seed dressing and 5.7% emamectin benzoate stem and leaf spray>the combination of 25% spinetoram stem and leaf spray>5.7% emamectin benzoate stem and leaf spray.

Key words: maize, Spodoptera frugiperda, chloramphetamine, seed dressing, spinetoram