Susceptibility of Spodoptera frugiperda and Chrysodeixis includens (Lepidoptera: Noctuidae) to infections caused by Metarhizium rileyi

Authors

  • Suellen Karina Albertoni Barros Universidade Federal de Mato Grosso
  • Rafael Major Pitta
  • Rogério Biaggioni Lopes
  • Euziclei Gonzaga de Almeida
  • Fátima Teresinha Rampelotti Ferreira

Abstract

Due to the reduced host spectrum of the entomopathogenic fungus Metarhizium rileyi, its pathogenicity against different target insects must be assessed to develop biopesticides capable of controlling more than one pest species. This study aimed to evaluate the susceptibility of the pest species Chrysodeixis includens and Spodoptera frugiperda to different isolates of M. rileyi and, thus, determine a possible influence of the host of origin on the pathogenic activity of these isolates. Three isolates [CG1312 (C. includens as original host), CG381 (S. frugiperda as original host) and a new wild isolate (C. includens as original host)] were tested against larvae of C. includens and S. frugiperda, in third instar age, by treatment of surfaces with conidial suspension, under laboratory conditions. Both species were susceptible to the isolates of M. rileyi, with mortality rates of 53-58 % for C. includens and 74-84 % for S. frugiperda. The results suggest that the host of origin may not be determinant in the selection of pathogenic isolates of M. rileyi against these two pest insects.

KEYWORDS: Biopesticide, soybean looper, fall armyworm, green muscardine, entomopathogenic fungus.

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Published

2020-07-08

How to Cite

BARROS, S. K. A.; PITTA, R. M.; LOPES, R. B.; ALMEIDA, E. G. de; FERREIRA, F. T. R. Susceptibility of Spodoptera frugiperda and Chrysodeixis includens (Lepidoptera: Noctuidae) to infections caused by Metarhizium rileyi. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 50, p. e61713, 2020. Disponível em: https://revistas.ufg.br/pat/article/view/61713. Acesso em: 26 dec. 2024.

Issue

Vol. 50 (2020)

Section

Research Article

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