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Not led by the nose: volatiles from undamaged Eucalyptus hosts do not influence psyllid orientation

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Farnier, K, Davies, NW ORCID: 0000-0002-9624-0935 and Steinbauer, MJ 2018 , 'Not led by the nose: volatiles from undamaged Eucalyptus hosts do not influence psyllid orientation' , Insects, vol. 9, no. 4 , pp. 1-14 , doi: 10.3390/insects9040166.

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Abstract

Psyllids (Hemiptera: Psylloidea) are small sucking insects with high host plant specificity. Despite the primitive olfactory system of psyllids, some species have been suggested to rely on host plant volatiles (HPVs) for seasonal migration between summer deciduous hosts and winter coniferous hosts. Similarly, enhanced attraction of psyllid vectors has been observed as a result of the manipulation of host odors by plant pathogens. As yet, there are no studies of olfaction in psyllids that utilize evergreen eucalypt hosts. We investigated the behavioral responses of adults of four Eucalyptus-feeding psyllids—Ctenarytaina eucalypti, C. bipartita, Anoeconeossa bundoorensis and Glycaspis brimblecombei—to their respective HPVs in Y-tube olfactometer bioassays. We also used existing physiological data for C. eucalypti to investigate potential olfactory tuning that may modulate the preference for morphologically juvenile leaves over morphologically adult leaves. Although adult C. eucalypti were consistently repelled by HPVs from damaged host leaves, none of the species exhibited positive chemotaxis to HPVs from undamaged leaves. Surprisingly, G. brimblecombei was repelled by HPVs from undamaged host leaves. Our findings provide little support for a significant role of olfaction in host location by Eucalyptus-feeding psyllids. We propose a number of ecological hypotheses to explain these unexpected findings.

Item Type: Article
Authors/Creators:Farnier, K and Davies, NW and Steinbauer, MJ
Keywords: Eucalyptus, Aphalaridae, jumping plantlice, sensory ecology, terpenes, foraging kairomone
Journal or Publication Title: Insects
Publisher: MDPI
ISSN: 2075-4450
DOI / ID Number: 10.3390/insects9040166
Copyright Information:

Copyright 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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