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Development of Metarhizium anisopliae as a Mycoinsecticide: From Isolation to Field Performance
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Elucidating the pathogenicity of Metarhizium to Euschistus heros (Hemiptera: Pentatomidae) eggs

Aline Nunes da Silva1, Janaína Brandão Seibert1, Jhonattan Rodríguez Guerrero1

  • 1Department of Entomology and Acarology, Escola Superior de Agricultura 'Luiz de Queiroz', University of São Paulo (ESALQ-USP), Av. Pádua Dias, 11, Piracicaba, SP CEP 13418-900, Brazil.

Journal of Invertebrate Pathology
|January 27, 2025
PubMed

Insights

Entomopathogenic fungi like Metarhizium anisopliae and Metarhizium pingshaense degrade insect egg walls, preventing hatching. These fungi utilize egg lipids for growth, confirming their ovicidal effect through penetration and nutrient absorption.

Area of Science:

  • Entomology
  • Microbiology
  • Plant Pathology

Background:

  • The ovicidal mechanisms of entomopathogenic fungi are not fully understood.
  • A hypothesis suggests metabolic activity of germinating fungal spores can render insect embryos non-viable without direct penetration.

Purpose of the Study:

  • To investigate the ovicidal effects and underlying mechanisms of Metarhizium anisopliae and Metarhizium pingshaense on insect eggs.
  • To compare the ovicidal strategies of these fungi with Beauveria bassiana.

Main Methods:

  • Microscopic examination of insect eggs treated with Metarhizium fungi.
  • Analysis of fungal interaction with the egg wall and internal structures.
  • Observation of nutrient transfer from eggs to fungal hyphae.

Main Results:

  • Metarhizium anisopliae and Metarhizium pingshaense significantly reduced nymph hatching to below 3%.
  • Fungal growth and penetration led to the degradation of the insect egg wall.
  • Lipids were observed migrating from the eggs into the fungal hyphae, indicating nutrient uptake.

Conclusions:

  • Metarhizium fungi exhibit ovicidal effects through physical penetration and degradation of the egg wall.
  • These fungi utilize egg lipid reserves as a nutrient source for their development.
  • The findings support the role of physical penetration and nutrient acquisition in fungal-induced ovicidal activity.
Keywords:
BrazilBrown stink bugEntomopathogenic fungusMetarhiziumOvicidal effectPentatomidae

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