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Type: Journal article
Title: Role of Diadegma semiclausum (Hymenoptera : Ichneumonidae) in controlling Plutella xylostella (Lepidoptera : Plutellidae): Cage exclusion experiments and direct observation
Author: Wang, X.
Duff, J.
Keller, M.
Zalucki, M.
Liu, S.
Bailey, P.
Citation: Biocontrol Science and Technology, 2004; 14(6):571-586
Publisher: Carfax Publishing
Issue Date: 2004
ISSN: 0958-3157
Statement of
Xin-geng Wang; John Duff; Michael A. Keller; Myron P. Zalucki; Shu-sheng Liu; Peter Bailey
Abstract: We evaluated the role of the larval parasitoid, Diadegma semiclausum Hellén (Hymenoptera: Ichneumonidae), in controlling Plutella xylostella (L.) (Lepidoptera: Plutellidae) by cage exclusion experiments and direct field observation during the winter season in southern Queensland, Australia. The cage exclusion experiment involved uncaged, open cage and closed cage treatments. A higher percentage (54-83%) of P. xylostella larvae on sentinel plants were lost in the uncaged treatment than the closed (4-9%) or open cage treatments (11-29%). Of the larvae that remained in the uncaged treatment, 72-94% were parasitized by D. semiclausum , much higher than that in the open cage treatment (8-37% in first trial, and 38-63% in second trial). Direct observations showed a significant aggregation response of the field D. semiclausum populations to high host density plants in an experimental plot and to high host density plots that were artificially set-up near to the parasitoid source fields. The degree of aggregation varied in response to habitat quality of the parasitoid source field and scales of the manipulated host patches. As a result, density-dependence in the pattern of parasitism may depend on the relative degree of aggregation of the parasitoid population at a particular scale. A high degree of aggregation seems to be necessary to generate density-dependent parasitism by D. semiclausum . Integration of the cage exclusion experiment and direct observation demonstrated the active and dominant role of this parasitoid in controlling P. xylostella in the winter season. A biologically based IPM strategy, which incorporates the use of D. semiclausum with Bt, is suggested for the management of P. xylostella in seasons or regions with a mild temperature.
Keywords: Biological control; foraging behaviour; parasitoids; direct observation
RMID: 0020040633
DOI: 10.1080/09583150410001682304
Appears in Collections:Agriculture, Food and Wine publications

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