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Insecticide Transfer Efficiency and Lethal Load in Argentine Ants.

L M Hooper-Bui1, E S C Kwok2, B A Buchholz3

  • 1Department of Environmental Science, Louisiana State University, Baton Rouge, LA 70803 ; Department of Entomology, University of California, Riverside, CA 92521.

Nuclear Instruments & Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms
|October 28, 2015
PubMed
Summary

Trophallaxis, or food sharing, influences toxicant distribution in Argentine ants. Higher hydramethylnon and fipronil levels in dead ants suggest impacts on pest control strategies.

Keywords:
AMSArgentine antLinepithema humileaccelerator mass spectrometryfipronilhydramethylnonresurgencetrophallaxis

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Area of Science:

  • Pest Management
  • Entomology
  • Toxicology

Background:

  • Argentine ants (Linepithema humile) are invasive pests.
  • Understanding toxicant dynamics is crucial for effective control.
  • Trophallaxis plays a significant role in ant colony communication and resource distribution.

Purpose of the Study:

  • To investigate the relationship between trophallaxis and toxicant load in Argentine ants.
  • To quantify the distribution of hydramethylnon and fipronil in live and dead ants.
  • To inform pest control strategies by examining toxicant transfer and accumulation.

Main Methods:

  • Utilized accelerator mass spectrometry (AMS) to trace 14C-labeled sucrose, hydramethylnon, and fipronil.
  • Analyzed toxicant levels in individual live and dead worker ants and queens.
  • Quantified the percentage of crop content shared during trophallaxis between single ants.

Main Results:

  • Approximately 50% of crop content, including toxicants, was shared between donor and recipient ants.
  • Dead ants (workers and queens) exhibited significantly higher concentrations of hydramethylnon compared to live ants.
  • Dead workers had significantly more fipronil than live workers, while queen fipronil levels were similar between live and dead individuals.

Conclusions:

  • Trophallaxis facilitates the transfer of toxicants within ant colonies.
  • Differential toxicant accumulation in dead versus live ants impacts control efficacy.
  • Colony resurgence may be linked to queen survival due to sublethal doses and altered trophallaxis, necessitating tailored bait strategies.