Journal of Zhejiang Agricultural Sciences ›› 2026, Vol. 67 ›› Issue (5): 1290-1296.DOI: 10.16178/j.issn.0528-9017.20250512

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Control effects of biological pesticides on Spodoptera frugiperda in fresh maize

JIANG Kai()   

  1. Dongyang Municipal Improved Variety Promotion Center,Dongyang 322100,Zhejiang
  • Received:2025-07-16 Online:2026-05-11 Published:2026-05-12

Abstract:

To study the control effect of biological pesticides on Spodoptera frugiperda on fresh maize in autumn in Zhejiang Province,using Zhenuoyu 18 and Hongtiannuo 18 as test materials,field experiments were carried out using four commercially available biological pesticides,namely Bt G033A,Mamestra brassicae nucleo polyhedrosis virus(MbNPV),Metarhizium anisopliae CQMa421,Beauveria bassiana,and one biological pesticide under development,Metarhizium anisopliae-Bacillus. The experiments included the application of biological pesticides alone,the combined application of biological pesticides,and the combined application of biological pesticides and chemical pesticides. The results showed that among the biological pesticides applied alone,MbNPV had the best control effect on 7 days after application(72.51%-81.90%),while the control effects of Bt G033A,Metarhizium anisopliae CQMa421,Beauveria bassiana,and Metarhizium anisopliae-Bacillus were relatively poor. When two biological pesticides were combined at half dose,Bt G033A showed a synergistic effect on MbNPV. When each of the five biological pesticides was combined with a half dose of broflanilide,all demonstrated good control efficacy,and the combined application reduced the amount of chemical pesticide by 50%. This study provides technical support for the control of Spodoptera frugiperda on fresh maize using biological pesticides and reduced chemical pesticide application.

Key words: fresh maize, Spodoptera frugiperda, biological pesticide, chemical pesticide, combined application

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