Artificial Diets With Different Protein Levels for Rearing Spodoptera frugiperda (Lepidoptera: Noctuidae)

Area of Science:

• Entomology
• Insect Physiology
• Pest Management

Background:

• Spodoptera frugiperda (fall armyworm) is a major agricultural pest with a broad host range.
• Dietary protein and carbohydrate levels significantly influence insect development.
• Understanding nutritional requirements is crucial for effective pest management strategies.

Purpose of the Study:

• To evaluate the impact of varying dietary protein levels on Spodoptera frugiperda larval development and feeding behavior.
• To compare key insect developmental parameters across different artificial diets.
• To assess the suitability of modified diets for laboratory mass rearing.

Main Methods:

• Larvae of Spodoptera frugiperda were reared on three artificial diets with differing protein concentrations (standard, half, and double).
• Key developmental parameters including relative consumption rate (RCR), relative growth rate (RGR), and efficiency of conversion of ingested food (ECI) were measured.
• Larval and pupal periods, pupal weight, larval survival, adult fecundity, and longevity were assessed.

Main Results:

• Relative consumption rate (RCR), relative growth rate (RGR), and efficiency of conversion of ingested food (ECI) varied significantly among the different protein diets.
• Dietary protein levels influenced the duration of larval and pupal stages and pupal weight.
• Larval survival, adult fecundity, and longevity were not negatively affected by the tested protein variations.

Conclusions:

• Altering protein levels in artificial diets does not adversely affect Spodoptera frugiperda population growth parameters.
• The tested diet variations are suitable for laboratory mass rearing of Spodoptera frugiperda.
• Further research is needed to determine the long-term effects of these diets on subsequent generations.