Grower-Based In Vivo Propagation of Entomopathogenic Nematodes
January 9th, 2026
We present two methods for farmers to mass-propagate entomopathogenic nematodes as bio-insecticides. The first method uses polyacrylamide gel as the nematode culturing substrate, while the second uses polymer-coated cotton wool as the culturing substrate. Both methods rely on in vivo propagation of nematodes within insect cadavers.
Overview
This article presents two grower-oriented methods for mass-propagating entomopathogenic nematodes (EPNs) as bio-insecticides. The first method compares the standard White trap technique with a polyacrylamide gel-based substrate for in vivo production of Steinernema carpocapsae and Heterorhabditis bacteriophora, showing improved nematode yields. The second method uses live Tenebrio molitor larvae embedded in polymer-coated cotton wool to propagate native species Oscheius onirici and Heterorhabditis georgiana, with nematodes harvested via systematic irrigation to create a field-ready slurry. Both approaches aim to provide farmers with simple, scalable, and independent nematode production systems.
Key Study Components
Area of Science
- Entomology
- Biological pest control
- Nematode mass production
Background
- EPNs are effective biocontrol agents for insect pests.
- In vivo propagation yields high-quality nematodes but is labor-intensive and costly.
- In vitro methods are more cost-effective but may produce lower-quality nematodes.
- Existing grower systems rely on external labs for inoculum calibration, reducing reliability.
Purpose of Study
- To develop reliable, grower-based EPN propagation systems.
- To enable farmers to produce their own nematodes after initial inoculum acquisition.
- To improve accessibility and scalability of EPN use in agriculture.
Methods Used
- In vivo nematode production using White trap method.
- Grower-oriented in vivo production using polyacrylamide gel as substrate.
- Mass propagation of native EPNs in Tenebrio molitor larvae.
- Embedding larvae between polymer-coated cotton wool layers.
- Systematic tray irrigation to harvest emerged nematodes into a slurry.
Main Results
- Polyacrylamide gel method produced more nematodes than White trap for S. carpocapsae and H. bacteriophora.
- Native species O. onirici and H. georgiana were successfully propagated in T. molitor larvae.
- Nematodes were efficiently harvested via irrigation, forming a field-applicable slurry.
- Both methods are technically simple and scalable for grower use.
Conclusions
- Grower-oriented systems reduce reliance on external laboratories.
- Methods enable continuous, on-farm EPN production.
- Approaches support greater farmer independence and profitability.
- Systems have potential for wide adoption in sustainable pest management.