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Q&A ViewAttendees 3

Medical, Urban, and Veterinary Entomology

10-Minute Paper

MUVE: Higher Flies: Forensics, Ecology, Behavior, and Control

Stability of behavioral resistance to imidacloprid in the house fly (Musca domestica)

Sunday, October 31, 2021
8:36 AM - 8:48 AM MT
Location: Colorado Convention Center, Meeting Room 210-212
In-Person

    Presenting Author(s)

  • Caleb Hubbard

    Postdoctoral Scholar
    University of California
    Grand Terrace, California

    • Co-Author(s)

  • Amy Christine Murillo

    Assistant Professor of Entomology
    University of California
    Riverside, California

The house fly (Musca domestica L.) is a cosmopolitan and synanthropic pest fly species commonly associated with confined animal facilities. One of the most common methods for house fly control is the use of insecticides, but insecticide resistance is an increasing problem due to the over-application of insecticides and lack of rotation among insecticidal chemical classes. House fly resistance to imidacloprid, the most widely used neonicotinoid insecticide available for fly control, has evolved in field populations through physiological and behavioral mechanisms. Behavioral resistance to imidacloprid was documented in a field population of flies from a southern California dairy, though the resistance was not uniform among individuals in the population. Flies were selectively bred for behavioral resistance to imidacloprid without increasing the physiological resistance profile of the selected flies, and behavioral, genetic, and genomic analyses were completed.

Physiological resistance to imidacloprid has been observed to be unstable and decline over time without continual section pressure. It is hypothesized that resistance has a fitness cost in the absence of insecticides. To date, the stability of behavioral resistance to imidacloprid in the house fly has not been evaluated. In the current study, we assess the stability of behavioral resistance in five behaviorally resistant fly lines, which were maintained without imidacloprid exposure for 14 months or 10-15 generations. Results from the stability studies will be discussed in further detail.