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Synthetic pheromone exposure increases calling and reduces subsequent mating in female Contarinia nasturtii (Diptera: Cecidomyiidae).

Authors
  • Hodgdon, Elisabeth A1
  • Hallett, Rebecca H2
  • Heal, James D2
  • Swan, Andrea Em1
  • Chen, Yolanda H1
  • 1 Department of Plant and Soil Science, University of Vermont, Burlington, VT, USA.
  • 2 School of Environmental Sciences, University of Guelph, Guelph, Ontario, Canada. , (Canada)
Type
Published Article
Journal
Pest Management Science
Publisher
Wiley (John Wiley & Sons)
Publication Date
Aug 20, 2020
Identifiers
DOI: 10.1002/ps.6054
PMID: 32816381
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Pheromone-mediated mating disruption, which uses large amounts of synthetic female pheromones to interrupt insect reproductive behavior, has been successful for managing important agricultural pests. While multiple mechanisms have been discovered explaining how synthetic pheromone treatments prevent males from finding females, it is less clear how unnaturally large doses of synthetic sex pheromone impact the behavior of female insects, particularly nonlepidopteran females. In some species, 'autodetecting' females possess pheromone receptors and respond to ambient pheromones by altering their mating behavior. Here, we test whether exposure to stereospecific and racemic synthetic pheromones influences calling and subsequent propensity to mate in female swede midge (Contarinia nasturtii Kieffer; Diptera: Cecidomyiidae), a pest of Brassica crops. In both laboratory and field settings, females exposed to stereospecific and racemic three-component pheromone blends called significantly more frequently and for longer durations than midges in control treatments. In the field, midges were twice as likely to call in pheromone-treated plots versus nontreated plots. Additionally, pheromone pre-exposure reduced subsequent mating: while 68% of female midges mated following control conditions, only 42% and 35% of females pre-exposed to stereospecific and racemic three-component blends mated, respectively. While more frequent calling within pheromone-treated backgrounds may increase the likelihood that females are detected by males, a reduction in female propensity to mate would increase the efficacy of a pheromone-mediated mating disruption system. Our work presents the first known investigation of autodetection behavior in Cecidomyiidae. Additional research is necessary to understand the implications of female autodetection for swede midge management. © 2020 Society of Chemical Industry.

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