Walk this way, fly that way: Goniozus jacintae attunes flight and foraging behaviour to leafroller host instar

Emma Aspin*, Michael A. Keller, Maryam Yazdani, Ian C. W. Hardy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Parasitoids exhibit distinct behaviours while foraging for their herbivorous hosts. Some are specialised with respect to the host stage they can utilise and even the age of individuals within a single stage. Observing the behavioural response of parasitoids to hosts of varying age may provide more practical understanding of potential biocontrol agents. A wind tunnel experiment was conducted to test for host-stage dependent foraging behaviour in Goniozus jacintae Farrugia (Hymenoptera: Bethylidae), a common but understudied parasitoid of the light brown apple moth (LBAM), Epiphyas postvittana (Walker) (Lepidoptera: Tortricidae), which is a pest of grapevine, Vitis vinifera L. (Vitaceae), and other crops in Australia. Goniozus jacintae was already known to parasitise instars 3-6 of LBAM, but most readily parasitises the later instars. Later instars are larger and have a higher rate of feeding, producing more faeces and silk deposits than earlier instars, and are likely to also produce more volatile cues that may be detected by parasitoids. We found that the timing, frequency, and duration of foraging behaviours of G. jacintae varied significantly among host instars. Flight duration was shortest when females were exposed to leaves infested by fifth instars. The profile of behaviours exhibited was different during pre- and post-flight foraging, with the newly described slow walking behaviour only exhibited in close proximity to a potential host. These results contribute to the understanding of bethylid foraging, a relatively unexplored aspect of bethylid reproductive behaviour, and towards enhancing the efficacy of utilising G. jacintae in the control of leafroller pests.

Original languageEnglish
Pages (from-to)350-361
Number of pages12
JournalEntomologia Experimentalis et Applicata
Volume169
Issue number4
DOIs
Publication statusPublished - Apr 2021

Bibliographical note

Copyright the Author(s) 2021. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

  • host location
  • host-stage selection
  • light brown apple moth
  • Epiphyas postvittana
  • wind tunnel
  • flight duration
  • parasitoid
  • Lepidoptera
  • Bethylidae
  • Tortricidae
  • biocontrol agents
  • leafroller pest

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