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Rearing Chrysoperla externa Larvae on Artificial Diets.

C E S Bezerra1, B B Amaral2, B Souza2

  • 1Depto de Entomologia, Univ Federal de Lavras, 37200-000, Lavras, MG, Brasil. carlos.esb@gmail.com.

Neotropical Entomology
|August 18, 2016
PubMed
Summary

Researchers developed a cost-effective artificial diet for rearing Chrysoperla externa (Hagen) larvae. This new diet significantly reduces the need for natural prey, lowering production costs for this beneficial insect predator.

Keywords:
Artificial dietsagricultural entomologybiological controlgreen lacewingmass rearing

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Area of Science:

  • Entomology
  • Insect Rearing
  • Biological Control

Background:

  • Chrysoperla externa (Hagen) is a valuable predatory insect used in biological control.
  • Rearing C. externa often relies heavily on natural prey, increasing production costs.
  • Developing cost-effective artificial diets is crucial for mass-rearing beneficial insects.

Purpose of the Study:

  • To evaluate three artificial diets for rearing Chrysoperla externa (Hagen) larvae.
  • To identify a diet that reduces production costs and dependency on natural prey.
  • To assess the impact of artificial diets on the performance of C. externa over multiple generations.

Main Methods:

  • Larvae of C. externa were fed three different artificial diets (two existing, one modified) from the 2nd instar onwards.
  • First instar larvae were fed eggs of Anagasta kuehniella.
  • Evaluated preimaginal development, survival, adult traits (size, longevity, fecundity), egg hatchability, and larval predatory capacity over seven generations.

Main Results:

  • The modified artificial diet described in the study performed best among those tested.
  • C. externa larvae successfully developed on artificial diets during the 2nd and 3rd instars.
  • The new diet reduced the dependency on A. kuehniella eggs by 90%.

Conclusions:

  • A novel artificial diet enables cost-effective mass-rearing of Chrysoperla externa (Hagen).
  • This advancement supports the wider application of C. externa in biological control programs.
  • Reduced reliance on natural prey significantly lowers rearing expenses for this important predator.