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Type: Journal article
Title: Response to host density by the parasitoid Dolichogenidea tasmanica (Hymenoptera: Braconidae) and the influence of grapevine variety
Author: Paull, C.
Schellhorn, N.
Austin, A.
Citation: Bulletin of Entomological Research: containing original and review articles on economic entomology, 2014; 104(1):79-87
Publisher: Cambridge University Press
Issue Date: 2014
ISSN: 0007-4853
Statement of
C.A. Paull, N.A. Schellhorn, and A.D. Austin
Abstract: Natural enemies that respond to prey in a density-dependent manner may be able to quickly suppress pest populations before they reach economically damaging levels. Although it is primarily the combination of a natural enemy's functional response and a population numerical response that will influence the maximum number of pests attacked, other factors may influence a density-dependent response. We conducted large-scale field experiments, both artificially inoculating grapevines with larvae and using naturally occurring populations, to quantify and characterize the response of a parasitoid, Dolichogenidea tasmanica (Cameron) (Hymenoptera: Braconidae) to different densities of its host, the pest of grapevines, Epiphyas postvittana (Walker) (Lepidoptera: Tortricidae). We showed that the response of D. tasmanica to the density of E. postvittana was inversely density-dependent, and that the degree of parasitism was consistently and significantly higher in the grape variety Cabernet Sauvignon compared with Chardonnay. While the significant effect of variety on the degree of parasitism may provide an option for increasing the parasitism of E. postvittana by D. tasmanica, it also highlights how differences in host plant can influence trophic interactions.
Keywords: density-dependence
Epiphyas postvittana
multi-trophic interactions
Rights: © Cambridge University Press 2013
DOI: 10.1017/S0007485313000527
Appears in Collections:Aurora harvest 7
Ecology, Evolution and Landscape Science publications

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