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Sprayable self-encapsulating starch formulations for Bacillus thuringiensis.

M R McGuire1, B S Shasha

  • 1Northern Regional Research Center, USDA-ARS, Peoria, Illinois 61604.

Journal of Economic Entomology
|October 1, 1990
PubMed
Summary
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Cornstarch and adjuvants enhance Bacillus thuringiensis (Bt) sprayable formulations, improving its persistence on plants. This study shows Bt insecticidal activity lasts longer when encapsulated.

Area of Science:

  • Agricultural Entomology
  • Biopesticide Formulation
  • Plant Pathology

Background:

  • Bacillus thuringiensis subsp. kurstaki (Bt) is a biopesticide used for insect control.
  • Formulation stability and persistence are crucial for effective field application of microbial pesticides.
  • Encapsulation can protect active ingredients and improve delivery of biopesticides.

Purpose of the Study:

  • To evaluate cornstarches and adjuvants as encapsulating agents for sprayable Bt formulations.
  • To assess the physical properties and plant surface retention of these formulations.
  • To determine the impact of encapsulation on the persistence of Bt insecticidal activity.

Main Methods:

  • Various cornstarches and adjuvants were tested in sprayable formulations with Bt.

Related Experiment Videos

  • Physical properties (viscosity, clumping) and plant surface retention (cotton leaves) were evaluated.
  • Insecticidal activity persistence against Ostrinia nubilalis neonate larvae was tested over time.

    • Main Results:

    • Formulations showed varied plant surface retention, with some lasting over 2 weeks.
    • A formulation with pregelatinized cornstarch (Mira-sperse) and sucrose demonstrated enhanced Bt persistence.
    • Encapsulated Bt exhibited significantly slower decreases in insecticidal activity compared to unencapsulated Bt over 2 weeks.

    Conclusions:

    • Sprayable formulations using cornstarch-based encapsulating agents can enhance Bt persistence.
    • Self-encapsulating Bt formulations offer a promising approach for improved biopesticide efficacy.
    • Further research into sprayable self-encapsulating formulations could optimize Bt delivery and performance.