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Comparative field stability of selected entomopathogenic virus formulations.

M R McGuire1, P Tamez-Guerra, R W Behle

  • 1Bioactive Agents Research Unit, USDA-REE-ARS, National Center for Agricultural Utilization Research, Peoria, IL 61604-3902, USA.

Journal of Economic Entomology
|October 30, 2001
PubMed
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Formulations of nucleopolyhedroviruses (NPVs) significantly improved insecticidal activity compared to unformulated virus. Lignin-containing NPV formulations demonstrated superior residual field activity, especially in cotton and cabbage crops.

Area of Science:

  • Entomology
  • Agricultural Science
  • Biotechnology

Background:

  • Nucleopolyhedroviruses (NPVs) are viral agents used for insect pest control.
  • Formulation of NPVs is crucial for enhancing their efficacy and field persistence.
  • Previous research indicates variability in NPV formulation effectiveness.

Purpose of the Study:

  • To evaluate the residual field activity of different nucleopolyhedrovirus formulations.
  • To compare the efficacy of spray-dried NPV formulations against Anagrapha falcifera and Autographa californica.
  • To determine the impact of formulation ingredients, such as lignin and Blankophor BBH, on NPV persistence.

Main Methods:

  • Spray-dried formulations of NPVs from Anagrapha falcifera and Autographa californica were prepared.

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  • Field tests were conducted on cotton (Mississippi) and cabbage (Illinois) crops.
  • Residual insecticidal activity was assessed within 24 hours and over time.

    • Main Results:

    • Significant differences in insecticidal activity were observed among formulations within 24 hours.
    • Formulations containing lignin demonstrated significantly longer-lasting activity compared to other formulations.
    • Unformulated virus showed significantly less insecticidal activity than formulated virus; Blankophor BBH provided minimal enhancement.

    Conclusions:

    • Formulation significantly enhances the insecticidal activity and field persistence of NPVs.
    • Lignin is a key ingredient for prolonging the residual activity of NPV formulations.
    • Optimized NPV formulations offer a promising strategy for sustainable insect pest management in agriculture.