Predation of the Eggs and Young Larvae of Spodoptera litura by the Third Instar Larvae of Chrysopa formosa

doi:10.16409/j.cnki.2095-039x.2021.11.009

Abstract

Abstract: To investigate the predation of the tobacco caterpillar Spodoptera litura by Chrysopa formosa, we studied the predatory capacity and functional response of C. formosa third instar larvae to eggs and young larvae of S. litura in the laboratory. The third instar larvae of C. formosa exhibited positive feeding behaviors and high predatory capacity to S. litura eggs, first, second and third instar larvae. The predators showed a type II functional response to all the tested stages of S. litura. Both age and density of prey had a significant effect on the predatory capacity of C. formosa. With the increase of prey age, the maximum daily predation, attacking rate and control efficiency of the green lacewing decreased obviously, and the handling time was distinctly prolonged. A significant decrease in predatory efficiency was noted for C. formosa with the increase numbers of S. litura. According to all parameters of the functional responses, the third instar larvae of C. formosa predated the most on S. litura eggs, with the maximum daily predation of 313.7, and the predatory efficiency of 23.5. The second highest predation was noted on the first instar larvae of S. litura, with the maximum daily predation and predatory efficiency of 130.5 and 9.9, respectively. Our results indicate that the green lacewing C. formosa has a potential to be used as biocontrol agent against this Noctuid pest.

Key words: Chrysopa formosa, Spodoptera litura, predatory capacity, functional response, biological control

CLC Number:

S476.2

WANG Yanan, LI Ping, HE Weiwei, ZHANG Maosen, WANG Mengqing, MAO Jianjun, ZHANG Lisheng, LI Yuyan. Predation of the Eggs and Young Larvae of Spodoptera litura by the Third Instar Larvae of Chrysopa formosa[J]. Chinese Journal of Biological Control, 2022, 38(2): 321-327.

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