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Elis Cristine Vilarinho1, Odair Aparecido Fernandes, Celso Omoto

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Area of Science:

  • Entomology
  • Pest Management
  • Insect Ecology

Background:

  • Adult movement and dispersal of Spodoptera frugiperda (fall armyworm) remain poorly understood.
  • Effective dispersal studies require marking techniques that do not negatively impact insect biology or behavior.

Purpose of the Study:

  • To evaluate the effects of various oil-soluble dyes on the development, mortality, and fecundity of Spodoptera frugiperda.
  • To identify suitable dyes for marking fall armyworm adults and eggs for release-recapture dispersal studies.

Main Methods:

  • Larvae of Spodoptera frugiperda were fed artificial diets containing different concentrations of five oil-soluble dyes: Solvent Blue 35, Sudan Red 7B, Sudan Black B, Sudan Orange G, and Sudan I.
  • Larval and pupal development and mortality, adult longevity, and female fecundity were assessed.

Main Results:

  • High dye concentrations (400 and 600 ppm) prolonged larval and pupal stages for all tested dyes.
  • Adult lifespan and egg production were not significantly affected by any of the dyes.
  • Sudan Red 7B and Solvent Blue 35 provided effective marking of adults and eggs, though blue-marked eggs were sometimes difficult to distinguish from naturally bluish eggs.

Conclusions:

  • Sudan Red 7B is a promising dye for marking Spodoptera frugiperda adults and eggs in dispersal studies.
  • Solvent Blue 35 also shows potential but requires further investigation for distinguishing marked from unmarked eggs.
  • Sudan Black B, Sudan Orange G, and Sudan I were not suitable for marking this pest.