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Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...
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Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
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Updated: Aug 13, 2025

Culturing and Genetically Manipulating Entomopathogenic Nematodes
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Interactions between Entomopathogenic Fungi and Entomopathogenic Nematodes.

Vladimír Půža1, Eustachio Tarasco2

  • 1Biology Centre of the Czech Academy of Sciences, Institute of Entomology, Branišovská 31, 37005 České Budějovice, Czech Republic.

Microorganisms
|January 21, 2023
PubMed
Summary

Entomopathogenic fungi (EPF) and entomopathogenic nematodes (EPN) are vital biocontrol agents. Their interactions within insect hosts, though rarely found naturally, significantly impact pest management strategies and pathogen efficacy.

Keywords:
biocontroleffectivenessentomopathogenic fungientomopathogenic nematodessynergy

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Area of Science:

  • Agricultural Entomology
  • Soil Ecology
  • Biological Control

Background:

  • Entomopathogenic fungi (EPF) and entomopathogenic nematodes (EPN) are natural soil inhabitants that infect and kill insects.
  • These organisms are extensively utilized as biological control agents in integrated pest management programs.
  • While sharing the soil environment and insect hosts, natural co-infections are seldom observed due to the soil's cryptic nature.

Purpose of the Study:

  • To review current knowledge on interactions between EPF and EPN within insect hosts.
  • To assess the impact of these interactions on natural pathogen populations.
  • To evaluate the implications for the application of EPF and EPN in biocontrol strategies.

Main Methods:

  • Literature review synthesizing existing research on EPF-EPN interactions.
  • Analysis of laboratory studies investigating co-infections and co-applications.
  • Examination of factors influencing interaction outcomes, including pathogen and host species, doses, and infection timing.

Main Results:

  • Co-application of EPF and EPN yields variable outcomes, including synergy, additive effects, or antagonism.
  • Interactions affect pathogen development and reproduction, ranging from normal reproduction to competitive exclusion.
  • Interaction outcomes are contingent upon specific pathogen-host combinations, pathogen loads, and infection sequences.

Conclusions:

  • Understanding EPF-EPN interactions is crucial for optimizing biocontrol efficacy.
  • Variability in interaction outcomes necessitates careful consideration of species, doses, and timing in biocontrol applications.
  • Further research is needed to fully elucidate in-host interactions and their ecological and applied consequences.