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Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (3): 139-144.doi: 10.11924/j.issn.1000-6850.casb2020-0068

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Spodoptera frugiperda: Host Selection and Effect on Its Growth and Development

Guo Zhixiang1(), He Chengxing1, Pu Chunxiao2, Chen Fushou1, Shang Hui1, Fan Huacai1, Bai Tingting1, Zeng Li1()   

  1. 1Institute of Agricultural Environment and Resource, Yunnan Academy of Agricultural Sciences, Kunming 650205
    2Datianba Agriculture Technology Service Center, Changning Yunnan 678100
  • Received:2020-05-07 Revised:2020-07-07 Online:2021-01-25 Published:2021-01-26
  • Contact: Zeng Li E-mail:zhixiangg@163.com;ynzengli@163.com

Abstract:

The aims are to provide reference for the forecast, scientific control, adaptability analysis and risk assessment of Spodoptera frugiperda. Using banana seedling, maize seedling and 3rd instar larva of S. frugiferda as experiment materials, the damage index to banana and maize, development duration, survival rate of larva, pupa size and adult emergence rate of S. frugiferda under selective and non-selective pressure were determined by indoor inoculation and natural infection. The results showed that S. frugiferda mainly damaged maize under non-selective pressure and just tasted banana cultivar ‘Guijiao 6’. After 7 days of inoculation under non-selective pressure, the damage index of corn and banana was 89.05 and 1.58, respectively. Under selective pressure, the larvae of S. frugiperda began to damage banana after 3 days of inoculation. After 3, 5 and 7 days of inoculation, the damage index of banana was 11.74, 16.51 and 24.76, respectively, indicating that banana was not the suitable host for S. frugiferda. The larva of S. frugiperda feeding on banana grew slowly with a small body. The period from the third instar larva to pupa was 9-14 days which was 2-4 days longer than that of maize. The adult emergence period was 9-14 days, which was 4-7 days longer than that of maize. Feeding on banana significantly affected the growth and development of S. frugiferda. The survival rate of larva was 20.0%, the pupation rate was 68.1%, the pupa size was 1.25 × 0.35 cm, the pupa weight was 0.13 g, the adult emergence rate was 47.8%, which was significantly lower than that of maize host, with the survival rate of larva of 86.7%, the pupation rate of 97.4%, the pupa size of 1.57 × 0.5 cm, the pupa weight of 0.21 g, and the adult emergence rate of 92.0%. S. frugiperda could feed on banana with light damage degree under selective pressure, it could complete the generation life cycle with slow growth and development speed. Banana is not a suitable host plant for S. frugiferda, but there is a certain risk of S. frugiferda outbreak on banana.

Key words: Spodoptera frugiperda, selective pressure, non-selective pressure, damage index, growth and development

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