Predatory responses of Chrysoperla sinica (Tjeder) larvae to Spodoptera frugiperda (J. E. Smith) eggs and larvae
Author of the article:HUANG Hai-Yi LIU Ya-Nan QI Yong-Feng XU Yong-Yu CHEN Zhen-Zhen
Author's Workplace:College of Plant Protection, Shandong Agricultural University, Tai’an 271018, China; Sishui Agricultural and Rural Bureau, Jining 273200, China
Key Words:Chrysoperla sinica; Spodoptera frugiperda; predation function; self-density
Abstract:
[Objectives] To investigate the potential of Chrysoperla
sinica to act as a biological control for Spodoptera frugiperda eggs and larvae. [Methods] Predatory
responses of C. sinica to S. frugiperda eggs and larvae were
measured at (25±1) ℃ under laboratory conditions. [Results] Predatory responses of all larval stages
of C. sinica were of the Holling Ⅱ type, and all had high
reliability. The theoretical daily maximum predation rate, instantaneous attack
rate and processing time of third instar C.
sinica larvae on S. frugiperda eggs were 192, 1.06 and 0.005 d, respectively, whereas those of 1st instar
larvae were 166.7, 0.889 and 0.006 d, respectively. The interaction
coefficients of 1st, 2nd and 3rd instar larvae to S. frugiperda eggs were 0.184, 0.260 and 0.224, respectively. The
interference effect was significantly smaller in first and second instar
larvae, which indicates that C. sinica can effectively control S. frugiperda eggs. [Conclusion] The results show that C. sinica is a potential biological control agent for the eggs and
1st and 2nd instars of S. frugiperda.