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Grower-Based In Vivo Propagation of Entomopathogenic Nematodes.

Shawn A Steffan1, Sehrish Gulzar2, Camila Oliveira-Hofman2

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Farmers can now produce their own entomopathogenic nematodes (EPNs) for insect pest management using two novel, reliable grower-based systems. These methods offer a scalable and cost-effective alternative to traditional propagation, promoting farm independence and profitability.

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Area of Science:

  • Agricultural Entomology
  • Biocontrol Agents
  • Nematode Mass Propagation

Background:

  • Entomopathogenic nematodes (EPNs) are effective biocontrol agents for insect pests.
  • Current in vivo EPN propagation is high-quality but labor-intensive and costly.
  • Existing grower systems lack reliability due to dependence on external inoculum calibration.

Purpose of the Study:

  • To develop novel, grower-oriented systems for reliable, in-house EPN mass propagation.
  • To enable farmers to produce their own EPN bio-insecticides independently.
  • To enhance the accessibility and cost-effectiveness of EPN production for agricultural stakeholders.

Main Methods:

  • Compared standard White trap in vivo EPN production with a grower-oriented polyacrylamide gel substrate method.
  • Mass-propagated native nematode species (Oscheius onirici, Heterorhabditis georgiana) in Tenebrio molitor larvae within a polymer-coated cotton wool bilayer.
  • Developed a systematic irrigation method for harvesting nematodes from the wool bilayer.

Main Results:

  • The grower-oriented polyacrylamide gel method yielded more nematodes than the standard White trap method for Steinernema carpocapsae and Heterorhabditis bacteriophora.
  • Successful mass propagation of native EPN species was achieved using the beetle larvae and cotton wool bilayer system.
  • The harvesting method efficiently produced a nematode slurry suitable for field application.

Conclusions:

  • The developed grower-oriented systems are technically simple, scalable, and reliable for EPN production.
  • These methods empower farmers with accessible tools for producing their own bio-insecticides.
  • Wider adoption of these systems can lead to increased farm independence and profitability.