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Updated: Jan 25, 2026
07:17
Culturing and Genetically Manipulating Entomopathogenic Nematodes
Published on: March 31, 2022
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Pheromone extracts act as boosters for entomopathogenic nematodes efficacy
Camila Oliveira-Hofman1, Fatma Kaplan2, Glen Stevens3
1USDA-ARS, SEFTNRL, Byron, GA 31008, USA.
Journal of Invertebrate Pathology
|April 30, 2019
Summary
Pheromone extracts significantly enhance the dispersal and efficacy of entomopathogenic nematodes (EPNs) in controlling insect pests. This discovery offers a promising strategy to improve EPN-based biological control applications.
Area of Science:
- Agricultural Science
- Nematology
- Biocontrol
Background:
- Entomopathogenic nematodes (EPNs) are vital biological control agents, but their efficacy is inconsistent.
- Host-derived extracts, particularly ascarosides (nematode pheromones), have shown potential to improve EPN dispersal and success.
Purpose of the Study:
- To investigate if pheromone extracts enhance the dispersal and efficacy of EPN infective juveniles (IJs).
- To evaluate the impact of pheromone treatment on EPNs' ability to control key insect pests.
Main Methods:
- Soil column experiments were conducted to assess IJ movement towards bait larvae (Tenebrio molitor) after pheromone treatment.
- Greenhouse tests were performed to evaluate the efficacy of pheromone-treated EPNs against pecan weevil (Curculio caryae) and black soldier fly (Hermetia illucens) larvae.
Main Results:
- Pheromone extracts significantly increased the movement and dispersal of Steinernema carpocapsae and Steinernema feltiae IJs towards T. molitor larvae.
- Pheromone treatment led to higher invasion rates of T. molitor by S. carpocapsae and improved infection by S. feltiae compared to controls.
- In greenhouse trials, pheromone-treated EPNs demonstrated superior control of C. caryae and H. illucens larvae.
Conclusions:
- Pheromone-mediated manipulation of EPN behavior can substantially enhance their pest control capabilities.
- Pre-application exposure of EPNs to efficacy-enhancing pheromones presents a viable strategy for improving biological control outcomes in agricultural settings.
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