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Insecticide susceptibility in Coptotermes formosanus and Reticulitermes virginicus (Isoptera: Rhinotermitidae).

W L Osbrink1, A R Lax, R J Brenner

  • 1Southern Regional Research Center, USDA-ARS, New Orleans, LA 70124, USA. osbrink@commserver.srrc.usda.gov

Journal of Economic Entomology
|October 30, 2001
PubMed
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Insecticide tolerance varies significantly between and within termite colonies. Formosan subterranean termites (Coptotermes formosanus) and Reticulitermes virginicus showed differing lethal times and susceptibility to various insecticides, impacting pest control strategies.

Area of Science:

  • Entomology
  • Pest Management
  • Toxicology

Background:

  • Subterranean termites pose significant structural and economic threats.
  • Insecticide resistance is a growing concern in termite control.
  • Understanding termite susceptibility to insecticides is crucial for effective management.

Purpose of the Study:

  • To determine lethal time responses of Formosan subterranean termites (Coptotermes formosanus) and Reticulitermes virginicus to eight insecticides.
  • To investigate intercolony and intra-colony variations in insecticide susceptibility.
  • To identify specific insecticides and termite castes/species with notable tolerance differences.

Main Methods:

  • Established lethal time to mortality responses for C. formosanus workers and soldiers, and R. virginicus workers.

Related Experiment Videos

  • Tested eight different insecticides against termite colonies.
  • Analyzed tolerance ratios and lethal time curves to assess susceptibility variations.

    • Main Results:

    • Significant differences in tolerance were observed among C. formosanus colonies for most tested insecticides, except fipronil.
    • C. formosanus soldiers exhibited varying tolerance, with some surviving exposure to permethrin, deltamethrin, and fipronil for extended periods.
    • A high percentage of R. virginicus colonies showed reduced susceptibility to several insecticides compared to the most susceptible colony.

    Conclusions:

    • Substantial intercolony and intra-colony differences in insecticide susceptibility exist in C. formosanus and R. virginicus.
    • Lethal time curves indicate varying degrees of tolerance and potential resistance development.
    • Findings highlight the need for tailored insecticide strategies based on termite species and colony-specific susceptibility.