Differences in egg parasitism of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae) by Enoggera nassaui Girault (Hymenoptera: Pteromalidae) in relation to host and parasitoid origin

Helen F Nahrung; B D Murphy

doi:10.1046/j.1440-6055.2002.00292.x

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Differences in egg parasitism of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae) by Enoggera nassaui Girault (Hymenoptera: Pteromalidae) in relation to host and parasitoid origin

Journal article

Peer reviewed

Differences in egg parasitism of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae) by Enoggera nassaui Girault (Hymenoptera: Pteromalidae) in relation to host and parasitoid origin

Helen F Nahrung and B D Murphy

Australian Journal of Entomology, Vol.41(3), pp.267-271

2002

DOI: https://doi.org/10.1046/j.1440-6055.2002.00292.x

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Abstract

Zoology

Evolutionary Biology

Ecological Applications

eucalypt leaf beetle

geographical variation

parasitoid efficacy

The first instances of egg parasitism of Chrysophtharta agricola, a pest of eucalypt plantations, are recorded. Enoggera nassaui was found parasitising C. agricola egg batches in Tasmania, the Australian Capital Territory (ACT), New South Wales and Victoria: this is the first record of this parasitoid species from Victoria. One instance of Neopolycystus sp. parasitising C. agricola eggs in Victoria was also recorded. Parasitism of egg batches by E. nassaui ranged from 0 to 55% between five geographical populations collected in mainland Australia (n = 45), and from 0 to 2% between two populations collected in Tasmania (n = 300). For mainland sites at which parasitism was recorded, parasitism rates within sites differed significantly from either population in Tasmania. Reciprocal exposure experiments using one Tasmanian (Florentine Valley) and one parasitised mainland (Picadilly Circus, ACT) population were conducted in the laboratory to examine whether these different parasitism rates were attributable to egg or parasitoid origin. Parasitoids from the ACT parasitised C. agricola eggs of both origins more successfully than parasitoids from Tasmania, with up to 65% wasp emergence compared with 33% from Tasmania. Parasitoid origin significantly affected the number of wasps that emerged from exposed batches, but not the total loss from parasitism.

Details

Title: Differences in egg parasitism of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae) by Enoggera nassaui Girault (Hymenoptera: Pteromalidae) in relation to host and parasitoid origin
Authors: Helen F Nahrung (Author) - University of Tasmania
B D Murphy (Author) - University of Canterbury, New Zealand
Publication details: Australian Journal of Entomology, Vol.41(3), pp.267-271
Publisher: Wiley-Blackwell Publishing Asia
Date published: 2002
DOI: 10.1046/j.1440-6055.2002.00292.x
ISSN: 1326-6756
Organisation Unit: University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Forest Research Institute
Language: English
Record Identifier: 99450384902621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Entomology

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