Formulation of entomopathogenic nematode-infected cadavers

Area of Science:

• Agricultural Science
• Entomology
• Nematology

Background:

• Entomopathogenic nematodes are vital biological control agents.
• Current application methods (aqueous suspension) have limitations.
• Application via insect cadavers faces storage and handling challenges.

Purpose of the Study:

• To assess the feasibility of formulating nematode-infected insect cadavers.
• To overcome hindrances associated with cadaver application of biocontrol agents.
• To identify effective formulations for improved nematode delivery.

Main Methods:

• Experiments utilized Heterorhabditis bacteriophora and Galleria mellonella.
• Nineteen different formulations were tested on insect cadavers.
• Formulated and non-formulated cadavers were evaluated for adhesion, nematode reproduction, infectivity, desiccation tolerance, and physical stability.

Main Results:

• A starch-clay formulation demonstrated excellent adhesion and no negative impact on nematode reproduction or infectivity.
• Two formulations allowed partial cadaver desiccation without affecting nematode reproduction.
• Formulated cadavers showed enhanced resistance to rupturing and clumping during agitation compared to non-formulated ones.
• Younger (4-day-old) cadavers were more tolerant to desiccation than older (8-day-old) cadavers.

Conclusions:

• Formulation of nematode-infected insect cadavers is feasible and offers significant advantages.
• A specific starch-clay formulation enhances the practical application of entomopathogenic nematodes.
• Formulated cadavers improve storage stability, handling, and delivery efficiency for biocontrol applications.