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Chinese Journal of Biological Control ›› 2024, Vol. 40 ›› Issue (3): 559-567.DOI: 10.16409/j.cnki.2095-039x.2023.01.056

• RESEARCH REPORTS • Previous Articles    

Evaluation of Two-way Predatory Function between Menochilus sexmaculata Larvae and Spodoptera frugiperda Larvae

CUI Xiangxin1, LI Huilu1, LI Pan1,3, TANG Jihong2, LI Jinhua1   

  1. 1. Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests, Ministry of Education/School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China;
    2. Environment and Plant Protection Institute, Chinese Academy of Tropical Agriculture Sciences/Key Laboratory of Integrated Pest Management on Tropical Grops, Ministry of Agriculture and Rural Affairs/Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Haikou 571101, China;
    3. Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China
  • Received:2023-05-12 Published:2024-06-07
  • Contact: 国家重点研发计划(2021YFD1400701);海南省自然科学基金青年基金(321QN179);海南大学科研启动基金(KYQD-ZR-1962)
  • Supported by:
    10.16409/j.cnki.2095-039x.2023.01.056

Abstract: Spodoptera frugiperda was first discovered in Haikou City in April 2019, and has gradually spread to all the cities and counties, becoming an important pest on multiple crops in Hainan Province. The ladybeetle Menochilus sexmaculata is an important predatory natural enemy in the agricultural ecosystem of Hainan. To evaluate the control ability of M. sexmaculataon S. frugiperda, the predatory function responses of the 3rd instar larvae of M. sexmaculata to the eggs and 2nd instar larvae of S. frugiperda, as well as the responses of the 3rd and 4th instar larvae of S. frugiperda to the eggs and 1st instar larvae of M. sexmaculata were studied in laboratory. The results showed that the two-way predatory function responses of S. frugiperda and M. sexmaculata fitted well with the Holling II model. The maximum daily predation of the 3rd instars of M. sexmaculata on the eggs and 2nd instars of S. frugiperda were 82.40 and 54.63, respectively. The larvae of S. frugiperda also preyed on the M. sexmaculata larvae, which correlated with the growth stages of the S. frugiperdalarvae. The maximum daily predation of the 3rd instars of S. frugiperda on the eggs and 1st instars of M. sexmaculata were 133.68 and 9.89, respectively. The data of the 4th instars S. frugiperda were 266.04 and 219.08, respectively. Moreover, the prey search efficiency of predators decreased with the increase of prey density in the predatory interaction between M. sexmaculata and S. frugiperda. The results show that, to achieve control S. frugiperda effectively, M. sexmaculata have to be released before the outbreak of the 3rd or older S. frugiperda larvae.

Key words: Menochilus sexmaculata, Spodoptera frugiperda, two-way predation, predatory functional responses, searching efficiency

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