Study on the predation potential of Chrysopa pallens on Spodoptera frugiperda.
Spodoptera frugiperda quickly spread after invading China from the end of 2018 to the beginning of 2019, and caused damage to maize production in Southwest China within half a year. Field investigation and observation showed that although the natural enemies of this pest were visible in the field, due to the low population of natural enemies, it could not form an effective control mode. In order to study the potential of Chrysopa pallens to control S. frugiperda, we conducted a predation functional response test. Results showed that the predatory effect of C. pallens adults predating on S. frugiperda eggs, and C. pallens larva predating on S. frugiperda larva could well fit Holling II functional response model. The theoretical daily maximum predation amount, instantaneous attack rate and processing time of C. pallens adult to the eggs S. frugiperda were 1115.56, 1.004 and 0.0009 d, respectively. The maximum daily predation, instantaneous attack rate and treatment time of Chrysopa larva to S. frugiperda small larva were 358, 1.074 and 0.003 d, respectively. Based on the results of this study, C. pallens has the potential to effectively control S. frugiperda. Our study provides baseline data for utilizing natural enemies to manage and control S. frugiperda.