Predation Capacity of Chrysopa pallens Larvae to Young Larvae of Spodoptera frugiperda

doi:10.16409/j.cnki.2095-039x.2020.04.013

Abstract

Abstract: The potential of Chrysopa pallens (Rambur) to control Spodoptera frugiperda (J.E.Smith) was evaluated under laboratory conditions in this study, and the predation behavior was also observed. The results indicate that the 2^nd and 3^rd instar larvae of C. pallens showed active feeding behaviors and strong predatory ability against the 1^st and 2^nd instar larvae of S. frugiperda. In particular, both the 2^nd and 3^rd instar larvae of C. pallens had a large predatory capacity to the 1^st instar larvae of S. frugiperda, with the average daily predation amount of 78.5 and 89.9, respectively, which corresponds to the maximum daily predation amount of 125 and 167, respectively, under theoretical conditions. All stages of C. pallens showed a type II functional response. The predation capacity, searching ability and controlling efficacy of C. pallens 3^rd instar larvae to S. frugiperda young larvae were significantly higher than those of C. pallens 2^nd instar larvae, respectively. And, the 3^rd instar larvae of C. pallens had much higher attacking rate, but shorter handling time. This study confirms that C. pallens larvae have a strong ability to control the young larvae of S. frugiperda, which has an important practical meaning for the long-term sustainable control of S. frugiperda by the predatory insect lacewings.

Key words: Chrysopa pallens, Spodoptera frugiperda, predatory capacity, functional response, biological control

CLC Number:

S476.2

LI Ping, LI Yuyan, XIANG Mei, WANG Mengqing, MAO Jianjun, CHEN Hongyin, ZHANG Lisheng. Predation Capacity of Chrysopa pallens Larvae to Young Larvae of Spodoptera frugiperda[J]. Chinese Journal Of Biological Control, 2020, 36(4): 513-519.

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